Ventilators · BiPAP family

Philips BiPAP Vision: troubleshooting and error codes

The ServiceForge knowledge base holds 80 documented symptoms for the Philips BiPAP Vision, with 155 ranked causes, 133 diagnostic checks with test points and expected values, and 172 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Exhalation Port Test: Low flow result

Circuit displays lower than normal leak rate at exhalation port; vents blocked or circuit unsound.

Ranked causes

1. Exhalation port vents blocked (common)
2. Circuit not sound (common)
3. Patient circuit (PC) defective (occasional)
4. Ambient flow module (AFM) defective (occasional)
5. Pressure relief valve (PRV) defective (occasional)
6. Intake low flow resistor (ILFR) defective (occasional)

6 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit will not power on high voltage

Device does not turn on when power switch is activated; no display or indicator lights

Ranked causes

1. Power cord damaged or disconnected (common)
2. Blown fuses (common)
3. PSS (Power Supply System) failure (occasional)
4. Main power switch non-functional (occasional)
5. AC Inlet failure (rare)
6. Transformer failure (rare)

First check

Inspect power cord

Test point: Power cord connection to unit
Expected: Cord fully inserted with no damage

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Ventilator inoperative (Vent Inop) patient safety

Unit displays Vent Inop indicator; system stops therapy delivery; LED lit on subsystem; hardware or communications failure detected

Ranked causes

1. Hardware failure in subsystem (common)
2. Spurious interrupt (MCU E01) (occasional)
3. Communications error (CRC/NAK/timeout) (occasional)
4. ROM CRC error (E0A) (rare)
5. RAM hardware error (E14) (rare)
6. Watchdog timer failure (rare)

First check

Observe Vent Inop indicator and subsystem LEDs

Test point: MC, DC, PC LED indicators
Expected: One subsystem LED lit indicating hardware fault

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows low flow

Circuit displays lower than normal leak rate at exhalation port during self test

Ranked causes

1. Exhalation port vents blocked (common)
2. Defective patient circuit (PC) (common)
3. Defective air flow management (AFM) (common)
4. Defective pressure relief valve (PRV) (common)
5. Defective inline flow resistor (ILFR) (common)

First check

Verify exhalation port vents are clear

Test point: Exhalation port
Expected: Vents not blocked and circuit sound

1 more check with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows occluded port

Leak rate less than predicted during exhalation port test

Ranked causes

1. Exhalation port blocked (common)
2. Defective patient circuit (PC) (common)
3. Defective air flow management (AFM) (common)
4. Defective pressure relief valve (PRV) (common)
5. Defective inline flow resistor (ILFR) (common)

First check

Verify exhalation port is not obstructed

Test point: Exhalation port
Expected: Port clear and unblocked

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation Port Test: Occluded exhalation port result

Leak rate was less than predicted; exhalation port blocked.

Ranked causes

1. Exhalation port blocked (common)
2. Patient circuit (PC) defective (occasional)
3. Ambient flow module (AFM) defective (occasional)
4. Pressure relief valve (PRV) defective (occasional)
5. Intake low flow resistor (ILFR) defective (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows excessive flow

Circuit displays higher than normal leak rate at exhalation port during self test

Ranked causes

1. Internal circuit improperly assembled (common)
2. Defective patient circuit (PC) (common)
3. Defective pressure relief valve (PRV) (common)
4. Defective inline flow resistor (ILFR) (common)

First check

Inspect internal circuit assembly

Test point: Internal circuit connections
Expected: All connections properly seated and assembly correct

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation Port Test: Excessive flow result

Circuit displays higher than normal leak rate at exhalation port; internal circuit improperly assembled.

Ranked causes

1. Internal circuit improperly assembled (common)
2. Patient circuit (PC) defective (occasional)
3. Pressure relief valve (PRV) defective (occasional)
4. Intake low flow resistor (ILFR) defective (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Outlet air temperature too warm caution

Air exhaust from unit is excessively hot during normal operation

Ranked causes

1. High ambient room temperature (common)
2. Inlet filter blocked or dirty (common)
3. Blower/Valve malfunction (occasional)
4. PC (Pneumatics Controller) failure (rare)

First check

Check ambient temperature

Test point: Room temperature near unit
Expected: Below 25°C (77°F)

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not power on

No display, no LEDs lit, no audible output, no airflow

Ranked causes

1. RTC failure on MC (rare)
2. NVRAM CRC error on MC (rare)
3. Backup battery failure (occasional)
4. Reference voltage failure on MC (rare)

First check

Measure input AC voltage at power receptacle

Test point: Unit AC input
Expected: 110-240 VAC depending on unit configuration

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blower speed exceeds maximum RPM caution

Blower motor running at > 16500 RPM; speed control circuit or sensor failure

Ranked causes

1. Blower speed control circuit failure (common)
2. Blower speed sensor malfunction (occasional)
3. Blower motor mechanical fault (occasional)

First check

Measure blower control voltage at PC board

Test point: Blower motor control output on PC
Expected: 0-5V or 0-10V depending on design

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows intermittent excessive flow

Leak rate intermittently high during exhalation port test

Ranked causes

1. Internal circuit not properly sealed or occluded (common)
2. Defective pressure relief valve (PRV) (common)
3. Defective patient circuit (PC) (common)

First check

Verify circuit occlusion and seal integrity

Test point: Internal and external circuit
Expected: Properly sealed and occluded

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows pressure regulation error

Leak test pressures cannot be attained during exhalation port test

Ranked causes

1. Internal pressure line disconnected or obstructed (common)
2. Defective air flow management (AFM) (common)
3. Defective patient circuit (PC) (common)

First check

Verify internal pressure line connection and patency

Test point: Internal pressure line
Expected: Connected and unobstructed

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation port test shows proximal line disconnected

Proximal pressure line is disconnected during exhalation port test

Ranked causes

1. Proximal pressure line internal connection loose or disconnected (common)
2. Proximal pressure line external connection loose or disconnected (common)
3. Proximal pressure line obstructed (occasional)

First check

Verify proximal pressure line internal connection

Test point: Internal proximal line connector
Expected: Connected and secure

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation Port Test: Intermittent excessive flow result

Leak rate was intermittently high during test; internal or external circuit not properly sealed.

Ranked causes

1. Internal or external circuit not properly sealed (common)
2. Pressure relief valve (PRV) defective (occasional)
3. Patient circuit (PC) defective (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Exhalation Port Test: Pressure regulation error result

Leak test pressures cannot be attained; internal pressure line disconnected or obstructed.

Ranked causes

1. Internal pressure line disconnected or obstructed (common)
2. Ambient flow module (AFM) defective (occasional)
3. Patient circuit (PC) defective (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Invalid blower calibration data caution

Blower calibration failed during installation; speed or pressure data not stored

Ranked causes

1. Blower calibration procedure not completed correctly (common)
2. Blower pressure transducer fault (occasional)
3. PC memory or EEPROM failure (rare)

First check

Re-run blower calibration from menu

Test point: Unit calibration interface or service port
Expected: Calibration completes without error; data stored

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Oxygen module cable disconnected during operation patient safety

OM detection error; oxygen module became unplugged or connection failed in use

Ranked causes

1. OM cable loose or disconnected (common)
2. OM cable connector corroded or damaged (occasional)
3. Oxygen module internal failure (occasional)

First check

Visually inspect OM cable connection at unit and module

Test point: OM cable connectors at PC board and oxygen module
Expected: Connectors fully seated; no bent pins or corrosion visible

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pressure regulation failure patient safety

Cannot regulate to 2 cm H2O in Pressure Out or Flow Limit Control mode

Ranked causes

1. ILFR valve stuck or failed (common)
2. PRV valve stuck or failed (common)
3. Blower output insufficient (common)

First check

Measure outlet pressure with ILFR valve commanded open

Test point: Unit outlet pressure sensor
Expected: Reaches 2 cm H2O setpoint or higher
Tools: Pressure gauge

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not start up high voltage

PC fails startup self-tests with voltage reference errors on MUX or ADC reads

Ranked causes

1. –12V voltage reference out of range (common)
2. –5V voltage reference out of range (common)
3. Reference voltage (positive) out of range (common)

First check

Measure –12V reference at MUX

Test point: MUX input
Expected: –10.12 to –14.04 V, −14.04 to −10.12
Tools: DMM

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Ventilator Inoperative icon illuminated with audible alarm patient safety

Red wrench icon displayed and alarm sounds; ventilator shuts down immediately

Ranked causes

1. ILFR (Inspiratory Limiter/Flow Regulator) failure (occasional)
2. PRV (Pressure Relief Valve) failure (occasional)
3. Blower failure (occasional)

First check

Refer to Vent Inop Troubleshooting Flow Charts

Test point: System status on display
Expected: Follow diagnostic flowchart on pages 6-14 and 6-15

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alarm battery voltage low caution

Low battery indicator displayed; backup battery depleted or charging failed

Ranked causes

1. Battery charge depleted (common)
2. Battery charging circuit failure (occasional)

First check

Measure battery voltage with multimeter

Test point: Battery terminals or DC output
Expected: Nominal battery voltage (12V or 24V per design)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Audible alarm not sounding patient safety

Alarm mute or no sound output during alarm condition; audio circuit fault

Ranked causes

1. Audible alarm current error on DC (common)
2. Alarm driver circuit fault (occasional)

First check

Verify alarm speaker electrical continuity

Test point: Speaker connector pins on DC board
Expected: < 10 ohms resistance between pins

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Backlight not illuminating caution

Display visible only in bright light; backlight LED or voltage circuit failure

Ranked causes

1. Backlight voltage error on DC (common)
2. Backlight LED failure (occasional)

First check

Measure backlight supply voltage at DC connector

Test point: DC backlight power output
Expected: Specified backlight voltage (typically 12-24V)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: PC/Laptop setup for BiPAP Vision testing

Configure serial communication between PC/Laptop and BiPAP Vision unit for troubleshooting and testing via Hyperterminal or Terminal emulation

Ranked causes

1. PC/Laptop communication not established (unknown)
2. Incorrect test cable or connection (unknown)

First check

Verify correct test cable for unit serial number

Test point: Unit serial number
Expected: S/N 105999 or lower uses 582161; S/N 106000 or higher uses 1004823; upgraded hybrids use 1004823 with 1004699

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Check Vent indicator LED malfunction patient safety

LED not lit when alarm should display; indicator driver circuit failure

Ranked causes

1. Check Vent LED current error on DC (common)
2. LED driver IC failure (occasional)

First check

Measure voltage across Check Vent LED

Test point: LED anode/cathode on DC board
Expected: ~2V across LED when activated

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display blank when powered on

Unit powers on as evidenced by indicator lights but LCD screen remains blank with no display output

Ranked causes

1. LCD display failure (common)
2. DC (Display Controller) board failure (occasional)

First check

Verify power to LCD display

Test point: LCD power connector
Expected: Power present at LCD connector

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display voltage error caution

Display dim, flickering, or no image; display module may not power

Ranked causes

1. DC display voltage out of range (common)
2. Display module failure (occasional)

First check

Measure display supply voltage on DC board

Test point: DC power output connector
Expected: Nominal supply voltage (typically 3.3V or 5V per schematic)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Fuses failing repeatedly high voltage

Fuses blow repeatedly after replacement indicating ongoing overcurrent condition

Ranked causes

1. Transformer short or overload (common)
2. PSS (Power Supply System) internal short (occasional)

First check

Install new fuses and disconnect transformer

Test point: Fuse holders after transformer disconnected from PSS
Expected: Fuses remain intact without blowing time

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Intermittent On/Off condition high voltage

Device cycles between power on and power off unpredictably during operation

Ranked causes

1. Power cord loose or damaged (common)
2. Main power switch intermittently failing (occasional)

First check

Verify power cord insertion and condition

Test point: Power cord at AC inlet
Expected: Cord fully seated with no visible damage or intermittent contact

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Keypad key stuck or not responding caution

Key held down unresponsively; key press registered continuously for >30 seconds

Ranked causes

1. Physical key stuck (common)
2. Keypad scanning circuit malfunction (occasional)

First check

Verify key is not mechanically stuck

Test point: Physical key buttons on front panel
Expected: All keys press and release freely

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Noise from ventilator

Audible noise or rattling sounds coming from the unit during operation

Ranked causes

1. Blower bearing wear or obstruction (occasional)
2. Transformer vibration or mounting loose (occasional)

First check

Locate source of noise

Test point: Unit during operation
Expected: Normal quiet operation or identified rattle/whine

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotary encoder does not adjust selection

Turning rotary encoder knob does not change displayed values or menu selections

Ranked causes

1. Rotary encoder mechanical or electrical failure (common)
2. DC (Display Controller) board failure (occasional)

First check

Test rotary encoder function

Test point: Rotary encoder during operation
Expected: Turning encoder changes displayed value

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Touch pad not responding to selection

Pressing touch pad buttons does not register input or change settings

Ranked causes

1. Touch pad sensor failure (common)
2. DC (Display Controller) board failure (occasional)

First check

Test touch pad response

Test point: Touch pad buttons
Expected: Button press registers on display

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vent Inop indicator LED malfunction patient safety

LED not illuminating during Vent Inop fault condition

Ranked causes

1. Vent Inop LED current error on DC (common)
2. LED driver circuit failure (occasional)

First check

Measure voltage across Vent Inop LED

Test point: Vent Inop LED on DC board
Expected: ~2V when fault condition present

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blower failure during operation

Blower overcurrent, undervoltage, or shutdown detected during operation

Ranked causes

1. Blower motor bad or drive circuit failure (common)

First check

Verify blower operation and current draw

Test point: Blower motor connector
Expected: Motor spins at commanded speed without stalling
Tools: Ammeter, tachometer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blower voltage reference out of range at startup

Blower drive voltage exceeds 100 mV during start-up self-test

Ranked causes

1. Blower voltage reference bad at startup (common)

First check

Measure blower drive voltage at startup

Test point: Blower drive output on MUX
Expected: ≤ 100 mV, 0 to 100 mV
Tools: DMM

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Blower and Valves

Calibration procedure for blower and valves after major component replacement to ensure proper pressure and flow control.

Ranked causes

1. Major component replacement requires blower and valve recalibration (common)

Calibration: Blower/Valve Calibration

Calibrates the Blower and Valves of the unit after major component replacement.

Ranked causes

1. Major component replacement requires blower and valve recalibration (common)

Calibration: Earth Leakage Current (Normal Pole, No Earth, L2) caution

Measure leakage current on normal pole configuration without earth and with L2 active

Ranked causes

1. Insulation breakdown or component leakage (rare)

First check

Measure normal pole, no earth, L2 leakage current

Test point: Earth leakage measurement points
Expected: Less than 300 microamps, < 300 microamps
Tools: Leakage current tester

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Earth Leakage Current (Reverse Pole, No Earth, L2) caution

Measure leakage current on reverse pole configuration without earth and with L2 active

Ranked causes

1. Insulation breakdown or component leakage (rare)

First check

Measure reverse pole, no earth, L2 leakage current

Test point: Earth leakage measurement points
Expected: Less than 300 microamps, < 300 microamps
Tools: Leakage current tester

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Earth Resistance caution

Measure earth resistance to verify electrical safety ground integrity

Ranked causes

1. Poor ground connection or corroded earth terminal (occasional)

First check

Measure earth resistance with 25 amp test current

Test point: Earth/ground terminal
Expected: Less than 0.10 Ohms, < 0.10 Ohms
Tools: Earth resistance tester

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Exhalation Port

System characterizes circuit leak rate; learned value stored in memory for accurate leak, minute ventilation, and tidal volume display. Without successful test, displays total leak instead of patient leak only.

Ranked causes

1. Exhalation port requires characterization after service or circuit changes (common)

First check

Install circuit with exhalation device and pressure measurement

Test point: Unit outlet, pressure connection
Expected: 6' smooth inner lumen tubing, whisper swivel, pressure pick-off port connected; outlet occluded

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Exhalation Port Test patient safety

System learns intentional exhalation port leak over pressure range to store in memory for accurate patient leak, minute ventilation, and tidal volume display. Test must complete successfully to show 'Pt. Leak'; failure shows 'Tot. Leak' instead.

Ranked causes

1. Exhalation port leak characterization required for accurate display and alarms (common)

First check

Verify equipment setup complete

Test point: Unit outlet and pressure connections
Expected: 6' tubing installed with whisper swivel and pressure pick-off port; pressure line connected; outlet occluded

3 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm Option 1 (Remote Alarm)

Verify Nurse Call/Remote Alarm output connector impedance changes on patient alarm activation

Ranked causes

1. MC board jumper configuration incorrect or relay malfunction (occasional)

First check

Measure continuity across Nurse Call/Remote Alarm output connector with unit off

Test point: Nurse Call/Remote Alarm connector High and Low
Expected: Approximately 48.6K to 53.7K Ohms, 48.6K to 53.7K
Tools: DVM

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm Option 2 (Normally Closed)

Verify Nurse Call/Remote Alarm output is normally closed and opens on patient alarm

Ranked causes

1. MC board jumper configuration incorrect or relay malfunction (occasional)

First check

Measure continuity across Nurse Call/Remote Alarm output connector with unit off

Test point: Nurse Call/Remote Alarm connector High and Low
Expected: Closed circuit

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm Option 3 (Normally Open)

Verify Nurse Call/Remote Alarm output is normally open and closes on patient alarm

Ranked causes

1. MC board jumper configuration incorrect or relay malfunction (occasional)

First check

Measure continuity across Nurse Call/Remote Alarm output connector with unit off

Test point: Nurse Call/Remote Alarm connector High and Low
Expected: Open circuit

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm output – Option 1 (Remote Alarm)

Verification of Remote Alarm function with JP1 and JP2 set at 2,3: resistance ~48.6–53.7 kΩ when unit off; open circuit when alarm active.

Ranked causes

1. Nurse Call relay or circuit malfunction (unknown)

First check

Measure continuity at Nurse Call connector (unit off)

Test point: Nurse Call/Remote Alarm High and Low
Expected: 48.6K to 53.7K Ohms kΩ, 48.6–53.7 kΩ
Tools: Fluke DVM or equivalent

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm output – Option 2 (Normally Closed)

Verification of Nurse Call normally closed function with JP1 at 2,3 and JP2 at 1,2: closed circuit when unit off; open circuit when alarm active.

Ranked causes

1. Nurse Call relay or output circuit malfunction (unknown)

First check

Measure continuity at Nurse Call connector (unit off)

Test point: Nurse Call/Remote Alarm High and Low
Expected: Closed circuit

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Nurse Call/Remote Alarm output – Option 3 (Normally Open)

Verification of Nurse Call normally open function with JP1 and JP2 at 1,2: open circuit when unit off; closed circuit when alarm active.

Ranked causes

1. Nurse Call relay or output circuit malfunction (unknown)

First check

Measure continuity at Nurse Call connector (unit off)

Test point: Nurse Call/Remote Alarm High and Low
Expected: Open circuit

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen alarm at no flow condition patient safety

Verification that unit generates 'no O2 Flow' alarm within 15 breaths or less when O2 cylinder is closed and disconnected.

Ranked causes

1. O2 flow alarm circuit malfunction (unknown)

First check

Verify O2 Flow alarm activates after disconnect

Test point: Vision alarm display and audio
Expected: Alarm activates within 15 breaths

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen Delivery at 100% patient safety

Verify oxygen analyzer reading is between 90-109% when oxygen set to 100%

Ranked causes

1. IPAP pressure drift affecting tidal volume (common)

First check

Set O2 to 100%, measure oxygen analyzer after stabilization

Test point: Oxygen Analyzer
Expected: 90% to 109% (inclusive), 90 to 109%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen delivery at 100% setpoint patient safety

Verification that oxygen analyzer reads at least 90% (up to 109%) at 100% O2 setting after stabilization, with tidal volume maintained.

Ranked causes

1. O2 delivery system malfunction at maximum setpoint (unknown)

First check

Set O2 to 100% and measure analyzer reading

Test point: Vision O2 parameter and Oxygen Analyzer display
Expected: 90% to 109%, 90–109%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen delivery at 18–24% setpoint patient safety

Verification that oxygen analyzer stabilizes and reads within 18–24% when O2 module connected at initial 21% setting with test circuit and cylinder at 50 psi.

Ranked causes

1. Oxygen module or analyzer malfunction (unknown)

First check

Connect O2 line and set regulator pressure

Test point: O2 cylinder valve and regulator
Expected: 50 psi

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen Delivery at 21% patient safety

Verify oxygen analyzer reading is within 18-24% when oxygen module is set to room air equivalent

Ranked causes

1. Oxygen analyzer not stabilized or calibration drift (common)

First check

Connect O2 line and set cylinder to 50 psi, measure oxygen level

Test point: Oxygen Analyzer
Expected: 18% to 24%, 18 to 24%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen Delivery at 30% patient safety

Verify oxygen analyzer reading is between 27-33% when oxygen module set to 30%

Ranked causes

1. IPAP pressure drift or oxygen delivery variance (common)

First check

Set O2 to 30% via Parameters menu, measure oxygen level

Test point: Oxygen Analyzer
Expected: 27% to 33% (inclusive), 27 to 33%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen delivery at 30% setpoint patient safety

Verification that oxygen analyzer reads 27–33% after adjusting O2 parameter to 30% and stabilization, with tidal volume maintained in range.

Ranked causes

1. O2 parameter setting or delivery system malfunction (unknown)

First check

Set O2 parameter and measure analyzer reading

Test point: Vision O2 parameter and Oxygen Analyzer display
Expected: 27% to 33%, 27–33%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen Delivery at 40% patient safety

Verify oxygen analyzer reading is between 36-44% when oxygen set to 40%

Ranked causes

1. IPAP pressure drift affecting tidal volume (common)

First check

Set O2 to 40%, measure oxygen analyzer after stabilization

Test point: Oxygen Analyzer
Expected: 36% to 44% (inclusive), 36 to 44%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen delivery at 40% setpoint patient safety

Verification that oxygen analyzer reads 36–44% after setting O2 to 40%, alarm is cleared, and no alarms remain after 8 breath cycles, with tidal volume in range.

Ranked causes

1. O2 delivery or alarm reset malfunction (unknown)

First check

Verify no alarms after 8 breath cycles at 40% O2

Test point: Vision alarm display
Expected: No alarms

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Oxygen Delivery at 60% patient safety

Verify oxygen analyzer reading is between 54-66% when oxygen set to 60%

Ranked causes

1. IPAP pressure drift affecting tidal volume (common)

First check

Set O2 to 60%, measure oxygen analyzer after stabilization

Test point: Oxygen Analyzer
Expected: 54% to 66% (inclusive), 54 to 66%
Tools: Oxygen Analyzer

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

More symptoms

Calibration: Oxygen delivery at 60% setpoint
Calibration: Oxygen Delivery at 80%
Calibration: Oxygen delivery at 80% setpoint
Calibration: Oxygen Flow Module zero voltage
Calibration: Oxygen Module Alarm at No Flow
Calibration: PAV/T mode activation and display verification
Calibration: Run-In Cycle Procedure
Calibration: Tidal Volume
Check Ventilator icon illuminated with audible alarm
Circulation fan not operational
EPROM upgrade or PAV/T mode installation
Exhalation Port Test: Proximal pressure line disconnected result
ILFR valve voltage reference out of range at startup
Loss of AC power detection and response
Main Power indicator blinks sporadically
O2 valve voltage reference out of range at startup
Oxygen baffle installation
PRV valve voltage reference out of range
Touch pad adhesive failure during removal
Touch pad requires replacement

20 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`100`	RTC failure on the MC	Real Time Clock chip malfunction detected during power-up self-test	critical
`101`	MC NVRAM CRC error	Checksum of stored configuration data does not match calculated value	critical
`102`	Backup battery failure on MC	Battery voltage low or not present; backup power lost	warning
`103`	Vref failure on MC	Reference voltage not stable or out of tolerance	critical
`11D1`	Keypad error during startup	Key pressed during start-up tests or held down too long (>10 seconds)	warning
`11D7`	Invalid start-up test data	Invalid test case data in startup self-test sequence	error
`11D8`	Invalid BIST test data	Invalid Built-In Self Test case data detected during startup	error
`1201`	ADC timeout (Analog-to-Digital converter)	Internal ADC conversion incomplete after 173 usec delay during read of ILFR/PRV/O2/ANA/Vref	error
`1202`	Blower speed test fail	Invalid data in blower test status signal during operational test	error
`1203`	Error controlling operational tests	Invalid data in test case primary or secondary control signals	error
`1204`	MUX voltage error	Invalid data in MUX channel parameter or out-of-range reading	error
`1205`	Other voltage error	Invalid data in ADC channel parameter or unexpected reading	error
`1206`	IADC failed (internal ADC)	Internal ADC did not complete conversion sequence before background sensors read	error
`1207`	MC did not communicate within startup time	MC did not request status from PC within 30 seconds of PC power-up	critical
`1208`	12-volt voltage reference test failed (operational)	12V signal from MUX measured < 11V or > 13V during runtime test	error
`120A`	Bulk supply voltage reference test failed (operational)	Bulk voltage measured < 20V or > 38.88V during operational test	error
`120B`	-12-volt voltage reference test failed (operational)	-12V signal measured < -13V or > -11V during operational test	error
`120C`	-5-volt voltage reference test failed (operational)	-5V signal measured < -5.425V or > -4.547V during operational test	error
`120D`	Reference voltage test failed (operational)	Voltage reference measured < 3.749V or > 4.445V during operational test	error
`120E`	QSM failed (Queued Serial Module)	QSM communication or initialization test failed	error
`120F`	Error in rise rate processing	Rise rate information from MC-to-PC message value outside range 0-4	warning
`1210`	Blower voltage bad in safe state	Blower drive voltage measured > 15mV when unit in safe state (should be 0V)	error
`1211`	PRV voltage bad in safe state	PRV (pressure relief valve) drive voltage > 15mV during safe state	error
`1212`	ILFR voltage bad in safe state	ILFR (inspiratory flow rate?) drive voltage > 15mV during safe state	error
`1213`	O2 valve voltage bad in safe state	Oxygen valve drive voltage > 15mV during safe state	error
`1214`	Failure controlling startup tests	Invalid data in startup test case parameter	error
`1215`	12-volt voltage reference test failed (startup)	12V supply measured < 10.12V or > 14.04V during power-up self-test	warning
`1216`	ANA ground voltage reference test failed (startup)	ANA ground signal measured < 0mV or > 500mV during power-up test	warning
`1217`	Bulk supply voltage reference test failed (startup)	Bulk voltage measured < 18.4V or > 38.88V during power-on self-test	warning
`1218`	–12V voltage reference test failed	–12V signal from MUX is outside acceptable range (–14.04 to –10.12 V)	critical
`1219`	–5V voltage reference test failed	–5V signal from MUX is outside acceptable range (–5.833 to –4.467 V)	critical
`121A`	Reference voltage test failed	Voltage reference signal from MUX outside range (3.749 to 4.445 V)	critical
`121B`	Blower voltage reference bad during startup	Blower drive voltage exceeds 100 mV	critical
`121C`	ILFR voltage reference bad during startup	ILFR drive voltage from internal ADC exceeds 100 mV	critical
`121D`	O2 valve voltage reference bad during startup	Oxygen module drive voltage from internal ADC exceeds 100 mV	critical
`121E`	PRV voltage reference bad during operation	PRV drive voltage from internal ADC exceeds 100 mV	error
`121F`	Blower voltage reference bad on second try after startup	Blower drive voltage exceeds 40 mV on second try immediately after first try	warning
`1220`	ILFR voltage reference bad on second try after startup	ILFR drive voltage exceeds 40 mV on second try immediately after first try	warning
`1221`	O2 valve voltage reference bad on second try after startup	O2 drive voltage exceeds 40 mV on second try immediately after first try	warning
`1222`	PRV voltage reference bad on second try after startup	PRV drive voltage exceeds 40 mV on second try immediately after first try	warning
`1225`	Internal ADC calibration divide by zero error	Analog reference voltage equals analog ground during ADC calibration	critical
`1226`	Bad O2 temperature sensor	O2 module temperature outside range (40–160°F) for 2500 counts or conversion not complete	error
`1227`	Blower out of calibration or stuck	Blower speed drifts ±750 RPM from desired setting for 12 seconds	error
`1228`	Bad pressure setpoint calculated	Low-pass filter of pressure setpoint in rise rate calculation out of range	error
`1229`	Patient pressure sensor drift error	Low-pass filter of pressure change average exceeds 10 cm H2O when flow < 5 LPM	error
`122A`	Corrupted resistance table	Invalid data detected in resistance table during startup	critical
`122B`	Invalid mode selected	Selected mode not supported in software during startup	critical
`122C`	Blower failure	Blower overcurrent, undervoltage, or shutdown detected	critical
`122D`	Bad backup unit outlet pressure sensor	Data cannot be read from backup unit outlet pressure sensor	critical
`122E`	Unit outlet pressure difference too large	Unit outlet and backup unit outlet sensor readings differ excessively	error
`122F`	Stuck backup unit outlet pressure sensor	Bad backup unit outlet pressure sensor or ADC reading	error
`1230`	Voltage failure	Voltage reference test failed during operation	critical
`1300`	Bad AFM calibration data CRC	AFM calibration data all zeroes or CRC check fails	critical
`1301`	Bad O2 module calibration data CRC	OM calibration all zeroes or CRC check fails	critical
`1302`	Bad PC calibration data CRC	PC calibration data all zeroes or CRC check fails	critical
`1304`	QSPI timeout during EEPROM read	QSPI does not finish within 100 microseconds after EEPROM selection for read	critical
`1305`	No AFM detected	AFM detection signal supplied by hardware exceeds 300 mV (cutoff for AFM presence)	critical
`1308`	Bad pressure setpoint message from MC	Master controller commands pressure greater than 40 cm H2O in message	error
`1309`	Bad rise rate message from MC	Rise rate setpoint in MC message exceeds 4	error
`130A`	Bad IPAP setpoint message from MC	IPAP setpoint in MC message exceeds 40 cm H2O (non-PAV) or 50 cm H2O (PAV)	error
`130B`	Bad O2 concentration setpoint message from MC	O2 concentration in MC message < 21% or > 100%	error
`130C`	Invalid MC message structure	Byte count in message does not match expected byte count	error
`1312`	AFM detect conversion timeout	Read of ADC not completed in time for AFM detection read	critical
`1313`	OM detect conversion timeout	Read of ADC not completed in time for OM detection read	critical
`1316`	Stuck absolute atmospheric pressure sensor	Atmospheric pressure reading < 20 in. Hg or > 40 in. Hg for 2.5 seconds	error
`1317`	Stuck unit outlet pressure sensor	Pressure reading < –5 cm H2O or > 70 cm H2O for 2.5 seconds	error
`1318`	Stuck patient pressure sensor	Pressure reading < –5 cm H2O or > 50 cm H2O for 2.5 seconds	error
`1319`	Stuck total flow sensor	Flow reading < –200 LPM or > 300 LPM for 2.5 seconds	error
`131A`	Stuck O2 flow sensor	O2 flow reading > 120 LPM for 2.5 seconds	error
`131B`	Bad air temperature sensor	Air temperature outside range (40–160°F) for 2500 counts or conversion incomplete	error
`131C`	ATM detected bad unit outlet pressure sensor	(High ATM − Low ATM) × 100 ≥ 5 × High ATM	error
`131D`	Bad PC calibration data 2 CRC	PC calibration data 2 CRC fails after filling with default or calculated values	critical
`131E`	Bad PC calibration data 3 CRC	PC calibration data 3 CRC fails after filling with default values	critical
`131F`	Error in drift test case	Invalid data detected in drift test case during calibration	error
`1320`	Bad AFM drift calibration data CRC	AFM calibration data 1 CRC fails after filling with default or calculated values	error
`1321`	Bad PC calibration data 4 CRC	PC calibration data 4 CRC fails after filling with default or calculated values	critical
`1322`	Sensor drift failure	Unit outlet or pressure sensor out of range (Tolerance ± 2 cm H2O around nominal)	error
`1323`	Bad calibration data 6 CRC	Drift calibration data could not be updated	critical
`1324`	Bad OM drift calibration data CRC	OM calibration data 1 CRC fails after filling with default or calculated values	error
`1325`	Total flow sensor drift	Total flow sensor drifted beyond acceptable tolerance	warning
`1326`	Oxygen flow sensor drift	Oxygen flow sensor drifted beyond acceptable tolerance	warning
`200`	DC display voltage error	Display supply voltage outside acceptable range	error
`201`	DC audible alarm current error	Alarm speaker current draw abnormal; open circuit or short detected	warning
`202`	DC Check Vent indicator current error	Check Vent LED current not detected or excessive	warning
`203`	DC Vent Inop indicator current error	Vent Inop LED current abnormal or not present	warning
`204`	DC backlight voltage error	Backlight supply voltage out of range or unstable	error
`205`	DC alarm battery low	Battery voltage below operational threshold	warning
`206`	Keypad error	Key held down continuously for 30+ seconds; no release detected	critical
`207`	Illegal operational test requested	Requested test does not exist in software	warning
`209`	+12V out of range	ADC voltage test on +12V rail fails	critical
`20A`	–12V out of range	ADC voltage test on –12V rail fails	critical
`20B`	+24V out of range	ADC voltage test on +24V supply fails	critical
`20C`	Reference voltage out of range	ADC voltage test on reference voltage fails	critical
`20D`	ADC could not return +12V value	ADC conversion of +12V reference fails during test	critical
`20E`	ADC could not return –12V value	ADC conversion of –12V reference fails during test	critical
`20F`	ADC could not return +24V value	ADC conversion of +24V reference fails during test	critical
`210`	ADC could not return reference voltage value	ADC conversion of reference voltage fails during test	critical
`211`	Power fail without AC fail	Loss of bulk supply without loss of AC input, caused by PS1 trip	critical
`300`	Circulation fan not operational	Fan motor not running or speed below minimum threshold	error
`301`	Invalid byte count in DCS message	Byte count from DCS not within acceptable range or equals zero	error
`303`	Blower speed exceeds 16500 RPM	Blower speed feedback exceeds safe maximum during operation	critical
`304`	Divide by zero in sum total breaths calculation	Sum of breath counts yields zero in divide operation	error
`305`	Divide by zero in baseline error calculation	Clock cycle times per breath equals zero	error
`306`	OM detection error (oxygen module disconnected)	Oxygen module cable disconnected during operation after successful initialization	critical
`306`	Divide by zero in BPM/Min calculation	Sum total time equals zero in BPM calculation	error
`307`	Divide by zero in Ti/Ttot calculation	Clock cycles time per breath equals zero	error
`30A`	MC scan cannot be performed	Response task does not complete processing before 10 msec interrupt occurs again	error
`30B`	Invalid command for CPAP mode	MC receives CPAP-incompatible command from DC intended for S/T or PAV/T modes	error
`30C`	Invalid command for S/T mode	MC receives S/T-incompatible command from DC intended for CPAP or PAV/T modes	error
`30D`	Invalid command for PAV/T mode	MC receives PAV/T-incompatible command from DC intended for CPAP or S/T modes	error
`30E`	No dispatch function for command	Command ID from DC not recognized by MC	error
`310`	Invalid mode update	Mode update message contains invalid data	error
`311`	Illegal alarm module detected	Hardware returns module type other than built-in Module B	warning
`312`	MC scan overruns 3 times in 1 hour	Response task overrun occurs 3 times within a 1-hour period	error
`313`	PAV/T security failure	PAV/T software implementation not accessible or corrupted	critical
`601`	Spurious interrupt	MCU received unexpected interrupt signal; stack or vector corrupted	error
`602`	Unassigned interrupt	Interrupt occurred for which no handler is defined	error
`603`	Bus interrupt	Illegal bus cycle or address error detected	error
`604`	Illegal instruction executed	CPU fetched and attempted to execute invalid opcode	critical
`605`	Breakpoint error	Software breakpoint trap executed but not expected by debugger	warning
`606`	Divide by zero error	CPU attempted integer division by zero; trap generated	error
`607`	Uninitialized interrupt	Interrupt occurred but handler not initialized or null	error
`608`	Software interrupt executed	Software deliberately triggered interrupt; handler not found or error state	error
`609`	Unused interrupt executed	Interrupt vector reserved or unused triggered an event	warning
`60A`	ROM CRC error (EPROM corrupted)	Calculated checksum of ROM does not match stored CRC	critical
`60C`	Bad MC state	Invalid value detected on MC state signal line	error
`60E`	Watchdog timer failure	Watchdog circuitry malfunction; software continues after long watchdog delay	critical
`614`	Walking RAM test error (RAM hardware fault)	Pattern written to RAM not read back correctly from one or more locations	critical
`616`	Watchdog reset after watchdog alarm PAL test	Power-on reset occurred after watchdog test completed successfully	error
`617`	SCI failed (serial communication interface)	SCI register not ready for character output after delay loop iterations complete	error
`700`	CRC error on third send to DC-MC	Calculated CRC does not match transmitted CRC on third attempt to send to DC	error
`701`	NAK received on third send to DC-MC	Negative acknowledgment message received on third attempt to send data to DC	error
`702`	Tack timeout on third send to DC-MC	No acknowledgment received within 750 microseconds on third send attempt	error
`703`	Trply timeout on third send to DC-MC	Slave did not begin responding within 1 millisecond of last byte from MC	error
`705`	Packet does not fit in message buffer	Message buffer overflow; packet size exceeds available space in "Move Packet To Message"	error
`706`	Invalid timer value	Timer not initialized before call or invalid data in timer parameter	warning
`707`	Invalid delay value	Timer delay exceeds one minute limit or timer not initialized	warning
`708`	Invalid delay (microsecond)	Microsecond delay requested exceeds 85 usec or timer not initialized	warning
`709`	GPT not initialized	Call to initiate timers made but GPT (general purpose timer) not initialized	error
`70A`	Invalid usec ticks	Timer microsecond parameter too large or timer not initialized	warning
`70B`	Invalid priority level	PCsed priority level value contains invalid data	warning
`70C`	CRC error on third send to PC	Calculated CRC does not match transmitted CRC when sending to PC on third attempt	error
`70D`	NAK received on third send to PC	Negative acknowledgment received when sending to PC on third attempt	error
`70E`	Tack timeout on third send to PC	No acknowledgment within 750 usec when sending to PC on third attempt	error
`70F`	Trply timeout on third send to PC	PC did not start responding within 1 msec of last byte sent from MC	error
`AC Power Failure`	Power to the device is lost while running	AC power lost while power switch in Start position	critical
`Apnea`	No spontaneous triggered breath detected within set apnea interval	Apnea monitor detects absence of spontaneous trigger within selected time interval	warning
`B00`	Bad ICB message from MC	Invalid status in self-test, byte count > 125, or unrecognized command ID in ICB message	critical
`B01`	Bad download sequence from MC	DC receives download message when not expecting it	critical
`B02`	Bad mode	Invalid data in test mode signals or mode-specific messages received in wrong mode	error
`B03`	Error decoding hard key table	ICB message corresponding to selected hard key not valid	error
`B04`	Bad screen state	Soft key selection received for mode when impossible (illegal keystroke)	error
`B09`	Simultaneous failure of audible alarm and system error LED	Simultaneous failure detected by hardware as indicated in status	critical
`B0A`	MC did not start communication within start-up time	MC did not send status request within 30 seconds of DCS startup	critical
`B0B`	Bad font type	Invalid data on screen font type signal during display initialization	warning
`B0C`	Bad video memory address	Calculated screen pixel address exceeds screen bounds (off screen)	error
`B0D`	DC queue overflow	No room in display queue for incoming MC message (background not running often enough)	warning
`B0E`	Bad graph size	X or Y length of graph <= 0 (invalid memory data)	error
`B0F`	No graph structure available	Attempt to initialize a fourth graph when only 3 are supported	warning
`B10`	Spurious keypad interrupts	More than 10 keypad interrupts in a row with no key depressed	warning
`Check Vent Error 301`	Ventilator operation error that may occur after PC/MC board upgrade	When upgraded unit is first turned on after installing repair kits 1004713 or 1000356	warning
`Check Ventilator`	System error has occurred but ventilator continues to operate	System error detected during operation	warning
`Disconnect`	Mask has been removed or excessive leak detected	Mask removed or becomes dislodged causing excessive leak	warning
`Hi P`	High pressure alarm	Proximal airway pressure exceeds high pressure setting for more than 0.5 seconds	warning
`Hi Rate`	High total breathing rate alarm	Total breathing rate (machine + spontaneous) exceeds Hi Rate alarm setting	warning
`LoMinVent`	Low minute ventilation alarm	Minute ventilation falls 50% or 5 LPM below limit for one minute period	warning
`Lo P`	Low pressure alarm	Proximal airway pressure remains below low pressure setting for duration set by Low Pressure Delay control	warning
`Lo Rate`	Low total breathing rate alarm	Total breathing rate (machine + spontaneous) below Lo Rate alarm setting	warning
`O2 Flow`	Oxygen supply lost or insufficient	Oxygen supply pressure or flow is lost during operation	warning
`P Regulation`	Loss of pressure regulation alarm	Measured proximal pressure differs more than ±5 cm H2O from set pressure for greater than 5 seconds	warning
`ProxLine Disc`	Proximal pressure line disconnect	Proximal pressure measures less than 1.0 cm H2O for greater than 1.0 second	warning
`System Failure`	System level failure that impairs performance	AC power failure, temperature overload fuse activation, or no bulk supply voltage	critical

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.