Ventilators · 7200 family

Puritan Bennett 7200 Ventilator: troubleshooting and error codes

The ServiceForge knowledge base holds 93 documented symptoms for the Puritan Bennett 7200 Ventilator, with 237 ranked causes, 135 diagnostic checks with test points and expected values, and 5 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Power disconnect alarm test failed patient safety

Backup power alarm system does not activate when main power lost

Ranked causes

1. Low or defective battery voltage (unknown)
2. Battery charging circuit defective (unknown)
3. Diode CR2 blown on motherboard (unknown)
4. Power switch defective (unknown)
5. Audio alarm harness open or short circuit (unknown)
6. Display cable assembly open or short circuit (unknown)
7. Conversion PCB interconnection cable open or short circuit (unknown)
8. Power switch continuity incorrect (unknown)
9. Audio alarm assembly defective (unknown)
10. Display controller or PCBs defective (unknown)
11. Conversion PCB defective (unknown)

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

Audio alarm does not operate properly patient safety

Audible alarm system not functioning or malfunctioning

Ranked causes

1. Utility panel harness fuse blown (unknown)
2. Audio alarm assembly defective (unknown)
3. Power switch defective (unknown)
4. Diode CR2 blown on motherboard (unknown)
5. Interface PCB defective (unknown)
6. Display controller defective (unknown)
7. Front panel display PCB defective (unknown)
8. Utility panel harness defective (unknown)

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

Leakage current out of specification high voltage

Electrical leakage current exceeds safety limits

Ranked causes

1. Compressor connected with leakage problem (unknown)
2. Humidifier connected with leakage problem (unknown)
3. Power cord damaged (unknown)
4. Defective compressor shock mounts (unknown)
5. Compressor defective (unknown)
6. Power supply defective (unknown)
7. Surge suppressor defective (unknown)

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

Oxygen percentages out of range patient safety

Delivered oxygen concentration not meeting specification

Ranked causes

1. Oxygen analyzer not properly calibrated (unknown)
2. Oxygen analyzer gel or membrane cap worn (unknown)
3. Oxygen sensor defective (unknown)
4. Oxygen analyzer instrument defective (unknown)
5. Proportional solenoid valves defective (unknown)
6. Conversion PCB defective (unknown)
7. Interface PCB defective (unknown)

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

Regulated compressor pressure out of range

Compressor regulator pressure outside 9.9 to 11.0 psig (68.26 to 75.85 kPa)

Ranked causes

1. Compressor inlet or outlet filter clogged (unknown)
2. Leaks in pulsation damper or plastic tees (unknown)
3. Obstruction in CV4 (unknown)
4. REG3 requires adjustment or is defective (unknown)
5. Compressor defective (unknown)
6. Leaky CV2 (unknown)
7. SOL9 not closing after compressor startup (unknown)

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

Analog meter or bar graph display PEEP reading out of range patient safety

Positive end-expiratory pressure reading on meter or display incorrect

Ranked causes

1. Tubing leak or obstruction in PEEP circuit (unknown)
2. Exhalation valve area ratio nonlinear (unknown)
3. Conversion PCB defective (unknown)
4. Exhalation valve defective (unknown)
5. Pressure transducer PCB defective (unknown)
6. Interface PCB defective (unknown)

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

Compressor pressure less than 7.4 psig at high flow patient safety

Compressor discharge pressure insufficient at maximum flow

Ranked causes

1. Flow coming out of air inlet port (unknown)
2. Leaks in pulsation damper and plastic tees (unknown)
3. Obstruction in compressor circuit (unknown)
4. SOL9 valve leaking (unknown)
5. REG3 defective (unknown)
6. Compressor defective (unknown)

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

Display shows all data on one line

Display output is compressed to a single line instead of multiple lines

Ranked causes

1. Display cable not connected properly to PCB assembly connectors (common)
2. Rear switch or jumpers on controller PCB set incorrectly (common)
3. Screen template EPROM (U17) not seated properly (occasional)
4. Screen template EPROM (U17) defective (occasional)
5. Electroluminescent or power supply PCB defective (occasional)
6. Controller PCB assembly defective (rare)

First check

Display cable connection to PCB assembly connectors

Test point: PCB assembly connectors
Expected: Cable connected properly with all pins inserted in connector shell

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

Lamps, indicators, displays, or audio alarm not active during lamp test

Visual or audible output not functioning during self-test

Ranked causes

1. Defective audio alarm or diode CR2 (unknown)
2. Defective audio alarm harness or analog meter harness (unknown)
3. Front panel display PCB defective (unknown)
4. Display controller or display cable defective (unknown)
5. Conversion PCB, interface PCB, or interconnecting cables defective (unknown)
6. Analog meter defective (unknown)

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

No cursor appears on display high voltage

Display shows no cursor; troubleshooting procedure to verify ventilator configuration, DISPLAY port, DCI settings, cable connections, test patterns, and power supply voltages.

Ranked causes

1. Ventilator not properly equipped with DISPLAY port or incorrect hardware/software (common)
2. DISPLAY port not functioning (common)
3. DCI port configuration incorrect (common)
4. Display cable disconnected or improperly connected (common)
5. Test screen pattern generation failure (occasional)
6. Display power supply voltage out of specification (occasional)

First check

Verify ventilator model and DISPLAY port hardware

Test point: Memory PCB (7200a) or DCI/display controller PCB (7200ae) switches S1, S2, S3
Expected: Per Section 3.1.2

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

Regulated air pressure out of range

Air regulator pressure outside 9.9 to 11.0 psig (68.26 to 75.85 kPa)

Ranked causes

1. Source pressure or flow insufficient (unknown)
2. Filters clogged (unknown)
3. Obstruction in CV2 (unknown)
4. Leaky compressor check valve CV4 (unknown)
5. REG2 requires adjustment (unknown)
6. REG2 defective (unknown)

First check

Verify regulated air pressure

Expected: 9.9 to 11.0 psig, ±0.55 psig

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

Sensitivity problems patient safety

Patient trigger sensitivity not working correctly or baseline pressure incorrect

Ranked causes

1. Analog meter reading incorrect or pressure trapped in circuit (unknown)
2. Check valve CV5 not functioning (unknown)
3. Improper patient pressure connections (unknown)
4. Analog meter defective (unknown)
5. Pressure transducer PCB defective (unknown)
6. Exhalation valve defective (unknown)

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

Ventilator does not communicate with display

Ventilator fails to communicate with 7202 Display but works properly with another display or printer

Ranked causes

1. Display rear switch in incorrect position (common)
2. Display jumpers set incorrectly (common)
3. Improper cable or connector connections (common)
4. Display cable damaged or faulty (occasional)
5. Electroluminescent or power supply PCB faulty (occasional)
6. Controller PCB assembly faulty (rare)

First check

Verify display rear switch position

Test point: rear switch on display
Expected: correct position per Figure 20-28

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

Delivered gas volumes out of range patient safety

Tidal volume or minute ventilation delivered to patient outside specification

Ranked causes

1. Flow measurement instrument not in correct mode or not zeroed (unknown)
2. Tubing leak or obstruction in gas delivery circuit (unknown)
3. Defective oxygen or air flow sensor (unknown)
4. Interface PCB defective (unknown)
5. Conversion PCB defective (unknown)

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

Screen display otherwise flawed

Display shows snow, missing segments, bright or dim lines or spots, ghost images, or fluctuating displays

Ranked causes

1. Display cable improperly connected to PCB assembly connectors (common)
2. Ribbon cables or interconnect cable improperly connected (common)
3. Electroluminescent PCB assembly failure (occasional)
4. Controller PCB assembly failure (occasional)
5. Flat toroids not transferred to new controller PCB (occasional)

First check

Verify display cable connection to PCB assembly connectors

Test point: PCB assembly connectors
Expected: Display cable properly connected with all pins inserted in connector shell

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

Analog meter or patient pressure display reading incorrect patient safety

Pressure measurement displays incorrect value or high pressure alarm not activating

Ranked causes

1. Tubing leak in pressure monitoring circuit (unknown)
2. Analog meter requires adjustment (unknown)
3. Pressure transducer PCB defective (unknown)
4. Analog meter defective (unknown)

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

Compressor air flow less than 110 lpm with maximum PEEP patient safety

Compressor air output insufficient for high PEEP ventilation

Ranked causes

1. Obstruction in compressor circuit (unknown)
2. Flow coming out of air inlet port (unknown)
3. REG3 requires adjustment (unknown)
4. Compressor defective (unknown)

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

Display works but printer does not

Printer does not produce output or function when connected to ventilator with working display

Ranked causes

1. Printer out of paper or cartridge (common)
2. Printer not powered or on-line (common)
3. Printer cable not properly connected (common)
5. Printer hardware malfunction (occasional)

First check

Printer has paper and cartridge

Test point: printer paper and cartridge compartments
Expected: paper present and cartridge installed

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

Keyboard test failed

Keyboard input not functioning properly during system test

Ranked causes

1. Audio alarm not functioning (unknown)
2. Keyboard defective (unknown)
3. Front panel display PCB defective (unknown)
4. Display controller defective (unknown)

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

Regulated oxygen pressure out of range

Oxygen regulator pressure outside 9.9 to 11.0 psig (68.26 to 75.85 kPa)

Ranked causes

1. Source pressure or flow insufficient (unknown)
2. Filters clogged (unknown)
3. REG1 requires adjustment (unknown)
4. REG1 defective (unknown)

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

Voltage levels out of specification at analog output connector

Analog output voltage signals outside expected range

Ranked causes

1. Open or short circuits in utility panel harness (unknown)
2. Interface or conversion PCBs not properly seated (unknown)
3. Interface PCB defective (unknown)
4. Conversion PCB defective (unknown)

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

Current draw out of specification caution

Ventilator electrical current consumption exceeds normal range

Ranked causes

1. Humidifier drawing excessive current (unknown)
2. Compressor drawing excessive current (unknown)
3. Power supply defective (unknown)

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

EST failure after power-on patient safety

Extended Self-Test fails with error codes displayed; ventilator will not pass EST until error conditions corrected

Ranked causes

1. Pneumatic system failure (common)
2. Transducer autozero failure (occasional)
3. Front panel control or indicator failure (occasional)

First check

Press EST button and observe POST execution

Test point: EST button on utility panel; 20-character display
Expected: POST completes with no critical errors; EST begins automatically
Tools: Visual inspection

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

EST test fails with error display patient safety

During EST execution, ventilator displays 'xxyz ERR' indicating hardware malfunction detected by self-test

Ranked causes

1. Hardware malfunction (unknown)
2. Operator response timeout (occasional)
3. PEEP circuit cannot achieve desired setting (occasional)

First check

Verify operator response to EST prompts within time limit

Test point: Display prompt
Expected: Operator presses required key within allotted time

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

Exhalation check valve assembly twisted or misaligned patient safety

Check valve assembly twists during door closure or operation, increasing exhalation resistance and potentially causing patient breathing obstruction

Ranked causes

1. Exhalation bacteria filter retaining ring not tight (common)
2. Check valve assembly not properly secured to Q3/T3 (common)
3. Front-loading compartment door not properly latched (occasional)

First check

Verify bacteria filter retaining ring is tight

Test point: Exhalation bacteria filter retaining ring
Expected: Filter cannot turn by hand

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

Performance verification test execution troubleshooting patient safety

Guidance for interpreting test results and determining when to proceed to repair procedures.

Ranked causes

1. Incorrect procedure execution (common)
2. Improper data entry on ventilator keyboard (common)
3. Accessory performance not meeting specifications (occasional)

First check

Verify procedure execution is correct

Test point: Test setup and sequence
Expected: All settings and steps match documented procedure exactly

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

POST error codes following power interruption

Self-test errors appear after loss of power to ventilator

Ranked causes

1. Low battery voltage from power interruption (unknown)
2. Defective diode CR1 on motherboard (unknown)
3. Error codes 1401 or 1501 persist (unknown)

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

POST failure during power-on patient safety

LED indicators on CPU PCB and/or 20-character display show error code continuously during Power-On Self-Test; ventilator cannot resume normal operation

Ranked causes

1. CPU kernel failure (rare)
2. CPU PCB test failure (occasional)
3. Offboard circuitry or transducer failure (occasional)

First check

Observe LED indicators on CPU PCB during power-on

Test point: CPU PCB front LEDs (80188) or back LEDs (8088)
Expected: No error codes displayed; code 7 (POST passed) or progress through test sections 0-5
Tools: Visual inspection

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

Q3/T3 flow sensor damage from debris or contamination patient safety

Sensor fails to provide accurate mass flow or temperature data; debris contacting sensing element destroys sensor; condensation from heated wires damages components

Ranked causes

1. Debris entering exhalation system or contacting sensor (common)
2. Condensation from heated exhalation limb wires (occasional)
3. Inadequate filtration allowing moisture or debris ingress (occasional)

First check

Visually inspect exhalation compartment and Q3/T3 sensor for debris or contamination

Test point: Q3/T3 sensing element and exhalation valve exit port
Expected: Clean, dry, no visible debris or liquid droplets

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

Test instrument PEEP reading out of range

Pressure measurement device reading incorrect PEEP level

Ranked causes

1. Tubing leak or obstruction in PEEP circuit (unknown)
2. Test instrument requires zeroing (unknown)
3. Pressure gauge defective (unknown)

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

Test instrument PEEP reading out of range (alternate cause)

Pressure measurement device reading incorrect PEEP level (SOL7 related)

Ranked causes

1. SOL7 valve defective (unknown)
2. PCB contacts dirty or oxidized (unknown)
3. Poor connection between pneumatic harness and motherboard (unknown)

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

Test instrument pressure reading does not match digital display

Pressure gauge reading differs from ventilator digital pressure reading

Ranked causes

1. Tubing leak between test points (unknown)
2. Test instrument not zeroed properly (unknown)
3. Pressure transducer PCB defective (unknown)

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

Ventilator settings changed due to power interruption patient safety

Operator settings lost or altered after power loss event

Ranked causes

1. Low or disconnected battery from power interruption (unknown)
2. Defective 80188 CPU PCB or memory PCB (unknown)
3. Motherboard defective (unknown)

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

Water trap/filter assembly leaks

Pneumatic system leaks detected after water trap/filter assembly disassembly and reassembly

Ranked causes

1. O-rings, gaskets, or filter elements not properly seated during reassembly (common)
2. Bowl threading damaged or bowls interchanged between versions (occasional)
3. Filter element F1 or F3 not replaced when required (occasional)

First check

Verify filter element replacement

Test point: Filter F1 or F3 position
Expected: New filter element installed in plastic head assemblies with spring-loaded drain valves

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

Air flow less than 162 lpm patient safety

Air gas flow output below minimum specification of 162 liters per minute

Ranked causes

1. Flow reading error when EST test differed from performance test (unknown)
2. Ventilator unable to reach required flow (unknown)

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

Back-up ventilation rates incorrect patient safety

Backup ventilation tidal volumes or rates not meeting specification

Ranked causes

1. BUV tidal volumes require calibration (unknown)
2. Interface PCB defective (unknown)

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

Compressor and ventilator cooling fans not operating properly caution

Cooling fan systems fail to run or operate at incorrect speed

Ranked causes

1. Insufficient AC voltage to fan (unknown)
2. Fan motor defective (unknown)

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

Condensation in exhalation compartment patient safety

Liquid droplets visible on exit port of exhalation valve; moisture present in exhalation system

Ranked causes

1. Heated wires on exhalation limb causing condensation (common)
2. Moisture in exhalation compartment damaging sensor or valve (common)

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

Electroluminescent or controller PCB failure caution

After all troubleshooting steps exhausted, display PCBs require replacement as matched sets.

Ranked causes

1. Electroluminescent or power supply PCB defective (rare)
2. Controller or piggyback PCB defective (rare)

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

Exhalation bacteria filter not warm caution

Exhalation filter heater not functioning or not reaching operating temperature

Ranked causes

1. No power to heater element (unknown)
2. Heater assembly defective (unknown)

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

Exhalation valve not opening during exhalation patient safety

Internal exhalation valve fails to open sufficiently during exhalation to maintain operator-selected PEEP/CPAP pressure

Ranked causes

1. Internal exhalation valve malfunction or obstruction (unknown)
2. Internal exhalation valve malfunction or obstruction (front-loading) (unknown)

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

Ground line resistance exceeds 0.1 ohm high voltage

Safety ground circuit resistance too high, indicating potential electrical hazard

Ranked causes

1. Short circuits or damage to power cord (unknown)
2. Faulty AC outlet (unknown)

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

Oxygen flow less than 162 lpm patient safety

Oxygen gas flow output below minimum specification of 162 liters per minute

Ranked causes

1. Flow reading error when EST test differed from performance test (unknown)
2. Ventilator unable to reach required flow (unknown)

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

Power supply voltages out of specification caution

Internal power supply output voltages outside normal range

Ranked causes

1. Power supply requires voltage adjustment (unknown)
2. Power supply or module defective (unknown)

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

Proportional valve group defective patient safety

Oxygen, air, or nebulizer solenoid valves not mixing or controlling gases for delivery to patient

Ranked causes

1. PSOL1 or PSOL2 solenoid defective (unknown)
2. SOL1 or SOL2 solenoid defective (unknown)

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

Q3/T3 flow sensor damaged patient safety

Exhalation flow/temperature sensor not functioning or providing incorrect data to CPU; sensor destroyed by debris or contamination

Ranked causes

1. Debris contamination of sensing element (common)
2. Attempting to clean contaminated sensor with alcohol or water (occasional)

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

Resistance across nurse's call relay not infinite when alarm off

Nurse call signal circuit not open when alarm inactive

Ranked causes

1. Short circuit in NURSE'S CALL circuitry wiring (unknown)
2. Interface PCB defective (unknown)

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

Resistance across nurse's call relay out of range

Nurse call signal circuit impedance outside specifications

Ranked causes

1. Short circuit in utility panel harness (unknown)
2. Interface PCB defective (unknown)

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

SOL1 or SOL2 coil resistance out of spec

Coil resistance measurement indicates electrical failure, possible open or short circuit in solenoid coil

Ranked causes

1. Solenoid coil opened (occasional)
2. Solenoid coil shorted (occasional)

First check

Measure solenoid coil resistance with DMM

Test point: Coil leads
Expected: 18 Ω for Allied coils or 19.4 Ω for Predyne coils
Tools: DMM

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

SOL1/SOL2 solenoid does not actuate

No distinct clapping noise heard when voltage applied to solenoid coil leads; valve does not respond to electrical command.

Ranked causes

1. Coil opened or shorted (common)
2. Valve poppet or diaphragm sticking or contaminated (occasional)

First check

Measure coil resistance

Test point: Solenoid coil leads
Expected: Approximately 18 Ω for Allied coils; 19.4 Ω for Predyne coils, ±1 Ω typical
Tools: DMM

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

Too much resistance across nurse's call relay during alarm

Nurse call signal circuit impedance excessive when alarm activated

Ranked causes

1. High resistance or short circuits in test connector wiring (unknown)
2. Interface PCB defective (unknown)

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

Calibration: BUV air volume patient safety

Back-up ventilator air volume potentiometer (R85) adjustment to ensure RT-200 displays 500 mL ± 10 mL

Ranked causes

1. R85 potentiometer requires adjustment (unknown)

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

Calibration: BUV air volume (R85)

Back-up ventilator air volume potentiometer on interface PCB requires adjustment to 500 mL ± 10 mL

Ranked causes

1. R85 potentiometer out of calibration (unknown)

First check

Switch test equipment to air gas type and zero

Test point: PTS-2000 or RT-200 display
Expected: Volume Air setting selected, equipment zeroed

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

Calibration: BUV oxygen volume patient safety

Back-up ventilator oxygen volume potentiometer (R86) adjustment to ensure RT-200 displays 500 mL ± 10 mL

Ranked causes

1. R86 potentiometer requires adjustment (unknown)

First check

Place ventilator into BUV mode using Method One or Method Two

Test point: Ventilator operating mode
Expected: Ventilator in BUV operating mode

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

Calibration: BUV oxygen volume (R86)

Back-up ventilator oxygen volume potentiometer on interface PCB requires adjustment to 500 mL ± 10 mL

Ranked causes

1. R86 potentiometer out of calibration (unknown)

First check

Place ventilator into BUV mode using Method One or Two

Test point: Ventilator control panel
Expected: Ventilator operates in BUV mode

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

Calibration: BUV volumes (R85 and R86) patient safety

Back-up ventilator oxygen and air volume potentiometers on interface PCB require calibration to ensure correct delivery volumes

Ranked causes

1. BUV volume potentiometers R85 and R86 require calibration (unknown)

First check

Select VOLUME screen and BTPS attribute on PTS-2000

Test point: PTS-2000 display
Expected: Volume screen with BTPS, L, corrected selected, threshold 10

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

Calibration: Monitor volume

Metabolic monitor volume calibration required after battery power disconnection from motherboard

Ranked causes

1. Battery power disconnected from motherboard connector J11 (common)

First check

Verify battery reconnected to motherboard connector J11

Test point: Connector J11
Expected: Battery power connected

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

Calibration: PEEP System Test patient safety

Verify PEEP system performance by measuring pressure at various settings (10, 30, and maximum cmH2O) using ventilator display and external test instrument.

Ranked causes

1. PEEP system requires calibration verification (common)

First check

Configure ventilator settings

Test point: Ventilator controls
Expected: CMV mode, 0.5L tidal volume, 1 bpm rate, 20 cmH2O sensitivity, 120 cmH2O high pressure limit (100 cmH2O for German ventilators), 3 cmH2O low inspiration pressure, 0 cmH2O low PEEP/CPAP pressure

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

Check valve assembly twisting risk patient safety

Risk of increased expiratory resistance if check valve assembly twists due to loose retaining ring

Ranked causes

1. Filter retaining ring not tight (common)

First check

Verify filter does not turn when retaining ring is engaged

Test point: Bacteria filter
Expected: Filter stationary and cannot be rotated by hand

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

Compressor and cooling fans not operating properly caution

Compressor or ventilator cooling fans fail to operate or operate intermittently.

Ranked causes

1. Insufficient ac voltage to fan (common)

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

More symptoms

Cooling fan operation failure
Debris protection for flow sensors during gas supply assembly service
Electrical safety test failure: current draw out of range
Electrical safety test failure: ground resistance out of range
Electrical safety test failure: leakage current out of range
Electroluminescent PCB and power supply PCB replaced without matched set
Electronics compartment fan filter requires cleaning or replacement
EST power loss during execution
Exhalation bacteria filter heater not warm
Exhalation bacteria filter heater removal required
Exhalation check valve (CV5) assembly dysfunction
Ground line resistance exceeds 0.1 Ω
High pressure leak in pneumatic chassis
Lamps, indicators, displays, and alarm not activating in test sequence
Moisture condensation in exhalation bacteria filter or Q3/T3
Moisture condensing in exhalation filter or Q3/T3
Oxygen and air flow sensor assembly replacement required
Oxygen delivery percentage out of range
PCB assembly cable connection check
POST and Total EST not passed
POST error codes displayed after power cycle
Power disconnect alarm not sounding
Pressure transducer PCB not responding
Printer self-test malfunction
REG4 cracking pressure and full back pressure too low
Replace audio alarm
Safety valve back pressure regulator (REG4) requires removal or replacement
Settings lost or changed after power cycle
SOL1 or SOL2 valve does not actuate
Temperature sensor integral to flow sensor assembly Q1/T1 and Q2/T2
Test REG1 or REG2 outlet pressure
Test regulator REG1 or REG2 outlet pressure
Water trap/filter assembly air/oxygen cross-connection

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

Error codes

Code	Meaning	Trigger	Severity
`1401`	Battery disconnection or calendar-clock reset event	After battery reconnection to Q1/T1 or Q2/T2 sensor assembly	info
`INVALID KEY`	Operator pressed incorrect key in response to EST prompt	Wrong key pressed twice in response to prompt	warning
`OPERATOR RESPONSE TIMED OUT. PLEASE RESPOND TO THE PROMPT.`	Operator failed to respond to EST prompt within allotted time	No key entry received before timeout interval expires	warning
`TIME OUT`	Test timeout; operator response delayed or ventilator unable to respond to action	During PEEP setting, PEEP circuit cannot achieve desired level	error
`xxyz ERR`	EST hardware error with specific error code xxyz	EST detects hardware malfunction during test execution	critical

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

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

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