Ventilators · 731 Series family

ZOLL 731 Z Vent: troubleshooting and error codes

The ServiceForge knowledge base holds 54 documented symptoms for the ZOLL 731 Z Vent, with 89 ranked causes, 74 diagnostic checks with test points and expected values, and 176 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Breath performance parameters out of tolerance patient safety

Tidal volume, PEEP, PIP, BPM, FIO2 or I-Time fail to meet specified tolerances during calibration tests

Ranked causes

1. Test setup error or apparatus contamination (common)
2. Test lung defective or O2 sensor contaminated (common)
3. O2 sensor calibration drift or sensor failure (occasional)
4. Anti-asphyxia valve damaged or contaminated (occasional)
5. Ventilator requires recalibration (occasional)

First check

Measure tidal volume at VT=700, FIO2=21, BPM=20, Itime=1000, PEEP=0

Test point: Flow sensor
Expected: 700 ml ± (5ml + 8% of setting), ± (5ml + 8%)

5 more checks with pass and fail actions, 12 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Compressor system check failure

System reports failure when comparing measured flow values to published specifications or when checking intake pressure, RPM, or airway pressure.

Ranked causes

1. Loose intake assembly (common)
2. Dirty or clogged disk filter (common)
3. Anti-Asphyxia valve failure or leak during calibration (occasional)
4. System leak or high flow measurement (occasional)
5. Dirty filters (common)

First check

Check airflow tolerance

Test point: measured flow
Expected: within ± (0.1 LPM + 5% of setting)

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

Complete power failure patient safety

Loss of power from both internal battery and external source during operation

Ranked causes

1. External power not applied (common)
2. Battery disconnected or not charging (common)
3. PIM board connection issues (occasional)
4. PIM board needs replacement (occasional)

First check

Apply external power to device

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

Device does not communicate with Remote Calibration System

USB connection fails, device serial numbers cannot be read, test load cannot be installed

Ranked causes

1. USB connection problem or hardware issue (common)
2. FTDI component failure on CPU board (occasional)
3. Multiple RCS applications running (occasional)
4. SPM board communication failure (occasional)

First check

Verify USB cable for wear and degradation

Test point: USB connector panel
Expected: No visible damage or wear
Tools: Visual inspection

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

Ventilator system test failure or misalignment with specifications patient safety

System Tests sequence fails to confirm ventilator operating within expected tolerances or calibration tables do not test properly; limited to three retry attempts before fault recorded

Ranked causes

1. Incorrect test setup configuration (common)
2. Compressor not exercised or long-term storage effects (occasional)
3. USB connection between ventilator and computer insecure or disconnected (occasional)
4. Incorrect power-on timing relative to RCS prompts (common)

First check

Verify test setup configuration

Test point: Ventilator connections and RCS interface
Expected: Setup matches detailed diagrams and instructions in maintenance chapter

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

Compressor flow calibration failure

Remote Calibration System reports failed calibration for compressor flow during discrete tests or system check.

Ranked causes

1. Compressor flow gain too low (common)
2. Compressor flow gain too high (occasional)
3. Dirty disk filter or restricted intake (common)

First check

Review compressor flow offset range

Test point: CF_Offset
Expected: 26823 - 35474

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

Compressor system calibration failure

Remote Calibration System reports failed calibration for intake pressure or compressor flow during discrete tests.

Ranked causes

1. Intake pressure gain too low (common)
2. Intake pressure gain too high (common)
3. Damaged fresh gas intake filters (occasional)

First check

Review intake pressure calibration range

Test point: IP_Offset
Expected: 22588 - 41168

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

O2 Flow Calibration failure

Oxygen flow calibration fails with out-of-range offset or gain values

Ranked causes

1. Gain calibration error - Gain Too Low (common)
2. Gain calibration error - Gain Too High (occasional)
3. SPM/Vent assembly defective (occasional)

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

5V bus compromised

Self-check failure of the 5V power bus

Ranked causes

1. PIM to SPM board connection damaged (common)
2. PIM board defective (occasional)

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

Communication error SC1175 occurs during service operation

Alarm SC1175 (Internal COMM) appears intermittently during RCS service procedures; expected during service but not operational use

Ranked causes

1. Software assert in RCS or intermittent hardware condition (common)
2. SPM board hardware problem (rare)

First check

Power cycle device

Test point: Device power
Expected: Alarm clears after reset
Tools: Power switch

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

Compressor bypass protection alarm not triggered patient safety

Fresh gas intake blockage does not trigger intake blocked alarm or alarms incorrectly indicate partial blockage

Ranked causes

1. Loose or incomplete intake assembly blockage (common)
2. Partial blockage or incorrect test procedure (occasional)

First check

Verify intake blocked alarm 1030 triggers during fresh gas intake occlusion

Test point: Intake assembly
Expected: Alarm 1030 triggered

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

External battery fault indicator

Possible faulty wiring of the external power connector

Ranked causes

1. External power connector wiring fault (common)
2. External power cable defective (occasional)

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

Internal communication battery fault (no external power) patient safety

Communication failure to device main battery without external power

Ranked causes

1. Battery connection to PIM board loose or faulty (common)
2. Battery or PIM defective (occasional)

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

Internal communication battery fault (with external power) patient safety

Communication failure to device main battery while operating on external power

Ranked causes

1. Battery connection to PIM board loose or faulty (common)
2. Battery or PIM defective (occasional)

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

Internal communication power components fault

Communication error with the PIM (power interface module)

Ranked causes

1. PIM to SPM or CPU connection fault (common)
2. PIM or CPU connector cable defective (occasional)

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

LCD is dark or GUI is blank during service

Screen shows vertical line only or remains OFF during RCS programming, expected behavior during reset state

Ranked causes

1. Device in reset or intermediate state (common)
2. LCD or display hardware failure (occasional)

First check

Observe LCD during startup

Test point: LCD screen
Expected: Normal display after power cycle or vertical line during reset
Tools: Visual inspection

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

RTC battery low or date/PM due alarm resets caution

Alarm 3110 indicates low RTC battery; date and PM due settings reset frequently after battery replacement

Ranked causes

1. RTC battery voltage low (common)
2. RTC battery retention clip bent during installation (occasional)

First check

Verify RTC battery is properly seated

Test point: RTC battery slot
Expected: Battery seated firmly with retention clip secured
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

SpO2 readings not displayed or sensor LEDs not illuminated patient safety

Pulse oximeter sensor fails to illuminate and no SpO2 readings appear on ventilator display

Ranked causes

1. Defective SpO2 sensor or cable (common)
2. Masimo board failure (occasional)

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

System test failure during service

Device test fails during RCS System Tests; requires troubleshooting before calibration can proceed.

Ranked causes

1. Setup error or equipment configuration issue (common)
2. Identified failure in ventilator or calibration (occasional)

First check

Physical Inspection

Test point: Device exterior
Expected: No damage or defects; room temperature 16–28 °C/60–82 °F

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

TSI calibration out of specification

TSI barometric pressure, temperature, or calibration date exceeds valid operating range during test station operation

Ranked causes

1. Environmental conditions outside specification (temperature or pressure) (common)
2. TSI calibration date expired (common)

First check

Verify TSI barometric pressure reading

Test point: TSI sensor
Expected: 69kPa < reading < 102kPa, 69–102

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

Button Check failure

One or more buttons on device not functioning correctly

Ranked causes

1. Button hardware defective (common)

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

Buzzer Check failure patient safety

Device buzzer not producing audible alarm sound

Ranked causes

1. Buzzer hardware defective (common)

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

Calibration: 731 Series Ventilator patient safety

Service calibration procedure using RCS 9.1 software; requires Calibrations sequence to pass, followed by System Tests and forensic memory erasure

Ranked causes

1. Calibration setup via RCS 9.1 (common)

First check

Run Calibrations sequence from Service Actions list

Test point: RCS 9.1 software
Expected: PASS status with no failures

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

Calibration: Erase Forensic Memory

Clear ventilator forensic memory after system tests and calibrations

Ranked causes

1. Forensic memory requires erasing as part of service procedure (common)

First check

Run Erase Forensic Memory from Service Actions list

Test point: RCS 9.1 interface
Expected: Erase Forensic Memory completes successfully

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

Calibration: O2 Kickstart

Near zero flow target calibration for fine flow control after opening valve

Ranked causes

1. Oxygen Delivery System restriction or gas flow issue (common)

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

Calibration: Remote Calibration System (RCS) preventive maintenance patient safety

The RCS performs testing and calibration of the ventilator through discrete tests, either individually for troubleshooting or as part of larger sequences (Calibrations, System Tests). TSI Flow Module requires yearly calibration before ventilator calibration.

Ranked causes

1. Preventive maintenance due or PM/Calibration Due alarm (#3120) triggered (common)

First check

Verify TSI Flow Module calibration date

Test point: TSI Flow Module
Expected: Last calibration date within one year

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

Calibration: System Tests patient safety

Run System Tests sequence from Service Actions after successful Calibrations to verify ventilator operation

Ranked causes

1. System Tests must follow successful Calibrations (common)

First check

Run System Tests sequence

Test point: Service Actions menu
Expected: System Tests completes without failures

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

Calibration: Write serial numbers to ventilator

Update serial numbers for new parts or recover corrupted component data using RCS software

Ranked causes

1. New serialized parts installed or data corruption recovery required (unknown)

First check

RCS software launched and ventilator communication established

Test point: RCS user interface Read Vent button
Expected: Communication established between RCS application and ventilator

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

Comm RAM and Bootloader Check failure

EMV COMM interface, CPU RAM, bootloader, or SPM communication not functioning

Ranked causes

1. Front panel assembly defective (common)

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

EMV Self Check failure

RCS detects active alarms on EMV indicating power system, communications, or pulse oximeter problems

Ranked causes

1. Power system, communications, or pulse oximeter fault (unknown)

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

Encoder Check failure

Rotary encoder not functioning in one or both directions

Ranked causes

1. Rotary encoder hardware defective (common)

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

Exhalation valve timing out of specification

Exhalation valve rise or fall delay exceeds maximum allowed time at reference pressures

Ranked causes

1. SPM assembly or board fault (common)

First check

Measure autocal rise settling time at 4 cmH2O

Test point: Autocal valve output
Expected: < 30ms, < 30ms

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

Input protection circuit failure

Damaged fuse on the PIM board

Ranked causes

1. PIM board fuse damaged (common)

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

LCD Contrast Set failure

LCD contrast cannot be properly adjusted; contrast control not functioning

Ranked causes

1. Ribbon cable from LCD to button board not seated correctly (common)

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

LCD Visual Inspection failure

LCD display defects detected; stuck pixels, blemishes, backlight or contrast problems

Ranked causes

1. LCD defective with stuck pixels, blemishes, backlight or contrast issues (common)

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

LED Check failure

One or more device LEDs not functioning; green, yellow, red, or IR LED defective

Ranked causes

1. LED hardware defective (common)

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

Manifold pressure leak detected caution

Airway pressure slope during simulated expiratory phase exceeds specification indicating system leak

Ranked causes

1. Leak in manifold connections or tubing (common)

First check

Measure airway pressure slope at 5 cmH2O

Test point: Airway pressure sensor
Expected: < 0.5 cmH2O per second cmH2O/s, < 0.5 cmH2O per second

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

Masimo communication error alarm

Masimo communication thread out or cable/board connection damaged; codes 2301 or 3301 displayed

Ranked causes

1. Masimo cable or board connection issue (common)

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

Masimo module failure alarm during self-check patient safety

Internal OEM Masimo board indicates failure during system self-check; codes 2300 or 3300 displayed

Ranked causes

1. CPU/SPO2 Stack or Front Panel Assembly failure (common)

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

O2 filter resistance out of specification

Sintered bronze filter pressure drop measured outside acceptable range at 100 LPM

Ranked causes

1. Sintered bronze filter contaminated or clogged (common)

First check

Measure filter resistance at 100 LPM flow

Test point: O2 inlet filter
Expected: 0.01–0.06 psi/LPM, 0.01–0.06 psi/LPM

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

O2 regulator damaged or not functioning properly caution

O2 regulators may be damaged from improper use, affecting oxygen supply to test station

Ranked causes

1. Oxygen regulator not closed or over-tightened (common)

First check

Verify O2 regulator is not over-tightened

Test point: O2 regulator handle
Expected: Hand-tight only, not over-tightened

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

O2 supply hose damaged or O-rings compromised caution

O2 hoses show signs of damage, debris, or missing/damaged O-rings affecting oxygen delivery

Ranked causes

1. O-rings missing or damaged in O2 hose fittings (occasional)

First check

Inspect O2 hose O-rings and connections

Test point: O2 data cable and O2 cable connections
Expected: O-rings in place, no visible damage or debris

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

O2 supply pressure out of specification caution

O2 input pressure measured outside acceptable limits at reference pressures

Ranked causes

1. O2 supply pressure incorrect (common)

First check

Measure O2 input pressure at 90 psi reference

Test point: O2 inlet
Expected: +/- 1 psi, +/- 1 psi

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

O2 system leak rate excessive caution

O2 leak rate exceeds maximum allowed specification at reference pressure

Ranked causes

1. Leaks in O2 tubing or fittings (common)

First check

Measure O2 leak rate at 55 psi

Test point: O2 system output
Expected: <= 2000 ml/hour, <= 2000 ml/hour

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

O2 valve leakage excessive caution

Reported O2 leak through valve exceeds maximum allowed specification

Ranked causes

1. O2 valve damaged or tubing kinked (common)

First check

Measure reported O2 leak through valve

Test point: O2 valve outlet
Expected: <= 0.3 LPM, <= 0.3 LPM

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

Power Switch Check failure

Power switch not functioning correctly; unit does not shut off or turn on as expected

Ranked causes

1. Power switch functional issue (common)

First check

Unit fully shuts off with no external power

Test point: Power switch Off position with no external power
Expected: Off and No External Power = Pass

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

Reported O2 supply pressure out of limits caution

O2 supply pressure reported by system outside acceptable limits at zero and 70 psi reference

Ranked causes

1. O2 supply tubing kinked or damaged (common)

First check

Measure reported O2 supply pressure at zero reference

Test point: O2 system sensor
Expected: < 2 psi

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

RTC date and time check failure

RCS verification of date and time in device versus PC failed; RTC battery or connector may be defective

Ranked causes

1. RTC battery depleted or faulty battery connector (common)

First check

RCS verifies date and time in device matches PC

Test point: SPM real-time clock module
Expected: Date and time match PC value

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

RTC date and time set failure

RCS unable to set date and time in ventilator; may indicate RTC battery depletion

Ranked causes

1. RTC battery depleted (common)

First check

RCS attempts to set date and time

Test point: SPM real-time clock module
Expected: Date and time written to device

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

Self-Check Failure: O2 Valve Stuck Open

System detects oxygen valve stuck in open position

Ranked causes

1. O2 Valve Stuck Open (common)

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

SPM blink LED and buzzer failure

SPM unable to drive red LEDs and buzzer; operator confirmation not received within 15 seconds during test

Ranked causes

1. SPM board faulty or cable connections failed (common)

First check

Verify red LEDs and buzzer activation

Test point: SPM output
Expected: Red LEDs and buzzer driven within 15 seconds

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

SPM communication failure

RCS test confirms communication signals (RX & TX), bootload and toggle are not functional

Ranked causes

1. SPM board faulty or connections to SPM failed (common)

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

Total Power Failure Alarm Check failure patient safety

Power failure circuit not functioning; total power loss alarm does not trigger or display correctly

Ranked causes

1. Power failure circuit defective; alarm does not trigger on total power loss (occasional)

First check

Verify Total Power Failure alarm activation

Test point: Power failure circuit alarm output
Expected: 120 second Total Power Failure alarm triggers (fast beep and red alarm LED blink pattern) and lasts for at least 10 seconds.

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

User prompt not visible on screen

Expected UI prompt does not appear to the operator during normal operation

Ranked causes

1. Prompt hidden behind application window (common)

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

Error codes

Code	Meaning	Trigger	Severity
`1001`	Self-Check Failure or Self Check Fault	Compressor control fault detected	error
`1001`	Compressor failure	Compressor fails to operate or fails to provide required flow for breath delivery when high pressure O2 unavailable	critical
`1001`	Compressor does not respond to control signals	At power up or during operation; blocked output tubing, kinked tubing, loose connector, diffuser or flow screen issue	critical
`1002`	Compressor flow signal high, low, or stuck	Compressor internal communication failure; faulty compressor flow transducer or tubing issue	critical
`1002`	Compressor communication fault	Communication lost between compressor controller and Smart Pneumatic Module when high pressure O2 unavailable	critical
`1002`	Self Check Failure	PGA or ADC faults for Compressor System detected	error
`1003`	Low compressor speed at startup	Flow from first breath is ±20% of expected flow for tidal volume at start up	error
`1003`	Fails power-on self check breath	Sensor/transducers/calibration file failure at startup	critical
`1010`	O2 valve fails in open position	O2 valve failure causing continuous flow during expiratory phase, preventing ventilation	critical
`1011`	Loss of O2 flow control	O2 flow path failure or fault preventing O2 flow control	critical
`1011`	O2 valve flow delivery failure	Signal to O2 valve not delivering required flow rate and compressor unavailable	critical
`1011`	Control fault indicating insufficient O2 flow rate	Self-check detects inadequate oxygen flow	error
`1012`	PGA or ADC faults detected for O2 System	Self-check detects signal processing electronics failure	error
`1012`	O2 valve communication failure	Communication lost between O2 valve and SPM when compressor unavailable for ventilation	critical
`1012`	O2 flow sensor signal to SPM fails	Internal communication failure between O2 flow sensor and SPM	critical
`1020`	Low oxygen supply pressure (< 35 psig)	O2 supply pressure falls below minimum threshold	error
`1030`	Gas Intake Failure	Insufficient intake flow detected	error
`1030`	Fresh gas or emergency air inlet blocked	Fresh Gas/Emergency Air Inlet blocked preventing compressor from delivering sufficient flow	critical
`1030`	Insufficient flow or blocked fresh gas intake	Gas intake failure or fault preventing fresh gas intake	critical
`1041`	High oxygen supply pressure (> 87 psig)	O2 supply pressure exceeds maximum threshold	warning
`1051`	Autocal valve malfunction	After 10 breaths, valve does not open, opens part way, or readings too noisy	error
`1051`	Run-time calibration failure	Self check failure during runtime or startup	critical
`1052`	Airway pressure signal stuck high, low, or unchanging	Self check failure during power-on or runtime	critical
`1052`	Airway pressure sensor communication loss	Communication lost between airway pressure sensor and SPM	error
`1052`	Self-check failure: airway pressure transducer	Transducer not behaving as expected during self-check	error
`1060`	Exhalation system valve failure	PIP fails to return to baseline pressure for 3 consecutive breaths	critical
`1060`	PEEP higher than limit for 3 consecutive breaths	Exhalation system failure with excessive PEEP	critical
`1061`	Airway pressure excessive for extended time	Exhalation system failure with airway pressure >70 cmH2O for 1.5s or >35 cmH2O/PIP high limit for 5s	critical
`1172`	5V self check failure	Self check failure during power-up	critical
`1172`	5V bus compromised	Self-check failure of the 5V bus	error
`1173`	Communication failure	PIM to CPU communication fault at power-up	critical
`1174`	Unable to zero/null transducer offset	Self check failure unable to null one or more transducer offsets	critical
`1174`	Self Check Failure	Flow transducers behaving outside specifications	error
`1174`	PGA offset control calibration failure	Device unable to calibrate transducers at startup; PGA offset control fails	critical
`1174`	Flow transducers are not behaving as expected	Self-check detects flow sensor anomaly	error
`1175`	Internal communication bus failure	Internal communication bus and host unable to communicate with sub-assemblies	critical
`1175`	Loss of I2C communication for 4 consecutive attempts	Self check failure losing I2C bus communication	critical
`1176`	Calibration table or header CRC error	Self check failure with corrupted calibration table	critical
`1176`	Corrupted calibration file detected	Calibration file checksum failure or file corruption during write	warning
`1420`	Complete power failure	Power lost from both internal battery and external source during operation	critical
`1430`	Drained battery	Internal battery power drops below amount required for ventilation without external power	error
`1471`	User interface module communication failure	Device unable to communicate with User Interface Module and interface controls	error
`1471`	Cannot communicate with IO expander for buttons and LEDs	Self check failure on IO expander communication	error
`1472`	High rate of corrupted packets from SPM	Self check detects excessive SPM packet corruption	error
`1472`	Smart pneumatic module communication failure	Device unable to communicate with Smart Pneumatic Module	error
`1473`	SPM data timeout	No valid data sent from SPM within 1 second	error
`1474`	Cyclic redundancy check failure	CRC checking fails between device and SPM	error
`1474`	CPU and PIM communication gaps detected	Self check detects communication gaps between CPU and PIM	error
`1475`	Cannot communicate with LCD contrast control circuit	Self check failure on LCD contrast control communication	error
`1475`	Contrast control communication failure	Device lost communication with contrast control	error
`1480`	CPU and SPM software revisions incompatible	Self check detects version mismatch between CPU and SPM	error
`2001`	Compressor does not respond to control signals (medium priority)	Medium priority version of code 1001	error
`2001`	Self Check Fault	Compressor control fault detected	error
`2002`	Self Check Fault	PGA or ADC faults for Compressor System detected	error
`2002`	Compressor flow signal high, low, or stuck (medium priority)	Medium priority version of code 1002	error
`2010`	O2 Valve Stuck Open	Alarm code variant of 1010	error
`2011`	Self Check Fault	Communication between O2 valve and SPM fails and compressor is available to provide ventilation	warning
`2011`	Control fault indicating insufficient O2 flow rate	Alarm code variant of 1011	error
`2011`	Loss of O2 flow control (medium priority)	Medium priority version of 1011	error
`2012`	O2 flow sensor signal to SPM fails (medium priority)	Medium priority version of 1012	error
`2012`	Self Check Fault	Signal to O2 valve outside calibration range for required flow rate and compressor available	warning
`2020`	O2 supply pressure less than 35 psi	Low O2 supply fault condition	error
`2030`	Insufficient flow or blocked fresh gas intake (medium priority)	Medium priority version of 1030	error
`2030`	Gas Intake Fault	Fresh Gas/Emergency Air Inlet blocked; compressor unable to deliver breath within ±10% of settings; high pressure O2 available	error
`2041`	High oxygen supply pressure (> 87 psig)	Alarm code variant of 1041	warning
`2053`	Self Check Fault	Expiratory time < 170 ms for 3 consecutive breaths	warning
`2062`	Exhalation System Fault	Airway pressure PIP measured at end of expiration > 5 cm H2O above baseline pressure PEEP	error
`2062`	PEEP measured exceeds setting plus 5 cmH2O	Exhalation system fault with elevated PEEP	error
`2070`	Airway Pressure High	Airway pressure PIP greater than high airway pressure limit for 2 consecutive breaths	warning
`2071`	Low Airway Pressure	Airway pressure PIP less than low airway pressure limit for 2 consecutive breaths	warning
`2072`	High Tidal Volume	During pressure targeted ventilation, delivered tidal volume exceeds user defined limit for 2 consecutive breaths	warning
`2073`	Low Tidal Volume	During pressure targeted ventilation, delivered tidal volume does not reach user-defined limit for 2 consecutive breaths	warning
`2074`	High Breath Rate	Actual breathing rate (set rate plus spontaneous patient rate) exceeds high alarm limit	info
`2075`	Low Breath Rate/Apnea	Actual breathing rate (set rate plus spontaneous patient rate) less than low alarm limit	warning
`2076`	Apnea	Spontaneous breathing rate less than low alarm limit in noninvasive ventilation, CPAP and BL modes	warning
`2090`	PEEP Leak	Airway pressure drops below PEEP setting by 2 cm H2O during expiratory phase	warning
`2095`	Insufficient Flow	Pressure target not reached during inspiratory period during pressure targeted ventilation	warning
`2100`	Patient Disconnect	Airway pressure fails to exceed PEEP setting by approximately 7 cm H2O	error
`2170`	Spont. Breath PIP High	Airway pressure PIP exceeds High PIP Limit Setting during 2 consecutive spontaneous breaths	warning
`2171`	Spont. Breath PIP Low	Airway pressure PIP exceeds Low PIP Limit Setting during 2 consecutive spontaneous breaths	warning
`2172`	Spont. Breath Vt High	High VT Limit exceeded during 2 consecutive spontaneous breaths	warning
`2173`	Spont. Breath Tt Low	Low VT Limit Setting not achieved during 2 consecutive spontaneous breaths	warning
`2300`	Self-Check: Pulse Ox - Module Failure (Internal OEM Board)	Masimo board indicates failure during power-up self-check	critical
`2300`	Self Check Fault	Pulse oximeter module fails while in use	error
`2300`	Masimo board indicates a failure	Self check detects board failure	error
`2301`	Communication from Masimo board has timed out	Self check timeout on board communication	error
`2301`	Self Check Fault	Communication between pulse oximeter module and device fails	error
`2301`	Internal COMM: Masimo communication thread out or damaged	Masimo communication link failure or thread timeout	error
`2314`	Pulse Ox Sensor Off Patient	Operating sensor loses patient signal due to disconnection, misalignment or poor perfusion	warning
`2401`	SpO2 Low	SpO2 value drops below Low SpO2 Limit (default 94%)	warning
`2410`	Heart Rate High	Heart rate greater than High Heart Rate Limit (default 120 beats/min)	warning
`2411`	Heart Rate Low	Heart rate less than Low Heart Rate Limit (default 40 beats/min)	warning
`2421`	Self Check Fault	Failure of input protection circuit and device is able to operate	error
`2421`	Input protection circuit failure	Damaged fuse on the PIM board	error
`2423`	Self Check Fault	Internal power circuit failed and external power connected but cannot be used	error
`2423`	Power system failure	Self check detects power fault	error
`2430`	Nearly Drained Battery	Device detects ≤5 minutes of battery operation remaining and external power not connected	warning
`2450`	Battery Discharge Fault	Battery temperature reaches 70°C (158°F), 5°C from maximum operating temperature	error
`2450`	Battery pack internal temperature too high	Battery internal temperature ≥ 70 °C	warning
`2455`	Battery communication fault while powered by battery	System powered by battery AND battery communication fails	error
`2455`	Internal COMM battery fault	Communication failure to device main battery without external power	error
`3001`	Self Check Fault	Compressor fails to operate or provide required flow within ±10% of settings; high pressure O2 available; FIO2 set to 100%	warning
`3001`	Compressor does not respond to control signals (low priority)	Low priority version of code 1001	warning
`3002`	Self Check Fault	Communication between compressor controller and SPM lost; high pressure O2 available; FIO2 set to 100%	warning
`3003`	Compressor flow signal high, low, or stuck (low priority)	Low priority version of code 1002	warning
`3011`	Loss of O2 flow control (low priority)	Low priority version of 1011	warning
`3011`	Self Check Fault	Signal to O2 valve outside calibration range; compressor available; user set FIO2 to 21%	warning
`3012`	Self Check Fault	Communication between O2 valve and SPM lost; compressor available; FIO2 set to 21%	warning
`3012`	O2 flow sensor signal to SPM fails (low priority)	Low priority version of 1012	warning
`3030`	Insufficient flow or blocked fresh gas intake (low priority)	Low priority version of 1030	warning
`3030`	Gas Intake Fault	Fresh Gas/Emergency Air Inlet blocked; compressor unable to deliver breaths within ±10%; high pressure O2 available; FIO2 set to 100%	error
`3031`	Intake Restricted	Fresh Gas/Emergency Air Inlet blocked but still capable of delivering breaths within ±10% of settings	warning
`3031`	Insufficient flow from fresh gas intake (intake restricted)	Fresh gas intake restricted or partially occluded	warning
`3032`	Fresh gas intake pressure sensor signal stuck high or low	Sensor and transducer fault on fresh gas/intake pressure	warning
`3032`	Self Check Fault	Inlet pressure transducer malfunction detected	error
`3041`	High O2 Supply Fault	High pressure O2 supply ≥75 psig (517 kPa) and < 80 psig (552 kPa)	warning
`3041`	O2 input pressure too high (low priority)	Low priority version of 1041	warning
`3073`	Tubing Compliance Fault	Tubing compliance correction greater than set tidal volume	warning
`3091`	AutoPEEP	Exhaled flow continues throughout expiratory period	warning
`3092`	Inspiratory Demand	End-inspiratory pressure < -1.0 cm H2O for 3 consecutive breaths	warning
`3110`	RTC battery drained at startup	Real-time clock alarm at power-up with date/time reset to default	warning
`3120`	PM Due	Preselected number of days elapsed since last calibration at startup	info
`3120`	Calibration due or overdue	Calibration interval exceeded or RTC battery issue	warning
`3120`	PM Due - Preventive Maintenance required	Device reaches one year anniversary since last service	info
`#3120`	PM/Calibration Due alarm	Preventive maintenance interval expired or calibration overdue	warning
`3121`	Power Cycle Need	Device running continuously for 30 days	warning
`3130`	Ambient pressure sensor reads near zero or full scale	Self check fault on barometric pressure sensor	warning
`3131`	Excessive altitude detected	Ambient pressure <0.36 ATM indicating altitude greater than 25,000 feet	warning
`3132`	Low altitude detected (below -2000 feet)	Ambient pressure >1.1 ATM indicating altitude below -2000 feet	warning
`3132`	Low Altitude	Ambient pressure transducer detects altitude < -2,000 feet below sea level (610 meters, 15.8 psig or 103 kPa)	warning
`3140`	Ambient Temperature Fault	Ambient temperature exceeds normal operating range > 131 °F (55 °C)	warning
`3141`	Ambient Temperature Fault	Ambient temperature falls below normal operating range < 14 °F (-10 °C)	warning
`3143`	Temperature sensor fault	Self check fault with temperature sensor reading beyond threshold	warning
`3172`	Self-check fault: airway pressure transducer cannot zero	Transducer unable to zero during initialization	error
`3300`	Alarm priority for Pulse Ox - Module Failure	Same condition as 2300 with alarm priority indication	critical
`3300`	Masimo board indicates a failure	Self check detects board fault	critical
`3300`	Pulse Oximeter Module Self Check Fault	Pulse oximeter module failure with user acknowledging condition	error
`3301`	Communication from Masimo board has timed out	Self check timeout on board communication	critical
`3301`	Pulse Oximeter Communication Self Check Fault	Communication between pulse oximeter module and device fails	error
`3301`	Alarm priority for Internal COMM error (dependent on sensor usage)	Same as 2301 with alarm priority based on Masimo sensor active status	error
`3310`	Pulse Ox Sensor Not Connected	Pulse oximeter detects no SpO2 sensor after successful operation	warning
`3311`	Defective pulse oximeter sensor	Pulse oximeter cannot identify or sensor has failed	error
`3312`	Pulse Search	Pulse oximeter is searching for pulse signal	info
`3313`	Pulse Ox Signal Interference	Outside signal or energy source prevents accurate reading	warning
`3315`	Ambient Light Fault	Excessive ambient light on SpO2 sensor or inadequate tissue covering	warning
`3316`	Invalid pulse oximeter sensor	Pulse oximeter does not recognize connected sensor	warning
`3317`	Low SpO2 Perfusion	Amplitude of arterial pulsation is weak	warning
`3318`	Low SpO2 Perfusion	Quality of input signal is low due to excessive motion or artifact	warning
`3421`	External Power Low/Disconnect	External power drops below ~11 VDC or is disconnected	error
`3422`	Battery pack not detected	Device unable to detect battery	error
`3423`	Battery Charging Fault	Battery charging circuit fails	error
`3430`	Low Battery	Device detects < 30 minutes battery operation remaining with no external power	warning
`3431`	Low Battery	External power connected to device with internal battery drained to low status	warning
`3441`	External power input voltage too high	Input voltage exceeds 33 VDC after fuse	error
`3442`	External power input voltage too low	Input voltage below 11.5 VDC after fuse	error
`3444`	External power voltage negative	Voltage in at less than -1 VDC	error
`3450`	Battery Discharge Fault	Battery temperature reaches 70 °C (158 °F) with external power connected	warning
`3451`	Battery discharge fault at high temperature	Battery internal temperature ≥ 75 °C	critical
`3452`	Battery charging fault due to high temperature	External power present AND battery temperature ≥ 45 °C	warning
`3453`	Battery charging fault due to low temperature	External power present AND battery temperature ≤ 0 °C	warning
`3455`	Battery communication fault while powered by battery	System powered by battery AND battery communication fails	critical
`3455`	Battery Fault	Device unable to communicate with internal battery with external power connected	error
`3455`	Internal COMM battery fault (external power active)	Communication failure to device main battery while operating on external power	error
`3470`	Internal COMM power components fault	Communication error with the PIM	error
`3470`	PIM communication failure	Too many consecutive NACKS for LTC1760, LTC4260, or AN1112	error
`3480`	SPM serial number mismatch between CPU and SPM	Self check fault on SPM serial number verification	critical
`3480`	Calibration Not Performed	Device software detects lack of calibration with installed SPM	warning
`EXT BATT`	External battery indicator	Possible faulty wiring of the external power connector	warning
`SC 1001`	High priority alarm indicating occlusion condition	Gas Output Port occluded or equivalent condition detected	warning
`SC 1030`	High priority alarm indicating occlusion or system fault	Gas output blockage or calibration resistor occlusion detected	warning
`SC1175`	Internal COMM I2C fault - cannot communicate with PGA or RTC	I2C bus communication error detected during operation	warning
`SC1471`	Internal COMM CPU cannot communicate with UIM adapter board	CPU-UIM communication loss detected at startup	error
`SC1472`	CPU-SPM communication failure due to CRC errors	CPU detects excessive CRC errors in SPM communication	error
`SC1473`	Internal COMM CPU-SPM communication failure	CPU monitors SPM and detects no response	error
`SC1474`	CPU-SPM communication failure due to timeout	CPU SPM communication timeout during operation	error
`SC1475`	Contrast fault - LCD not visible	LCD visibility check fails during startup self-check	error

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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.