Patient monitors

Welch Allyn Vital Signs Monitor 300: troubleshooting and error codes

The ServiceForge knowledge base holds 67 documented symptoms for the Welch Allyn Vital Signs Monitor 300, with 84 ranked causes, 91 diagnostic checks with test points and expected values, and 26 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Calibration: SpO2 monitor function (Nellcor)

Verify SpO2 pulse rate and saturation percentage display accuracy using Nellcor SRC-MAX functional tester

Ranked causes

1. Functional verification of SpO2 monitoring circuit (unknown)
2. Functional verification of SpO2 monitoring circuit (Masimo) (unknown)
3. Functional verification of SpO2 sensor with monitor (unknown)
4. Functional verification of temperature monitor function (unknown)
5. Functional verification of temperature probe with monitor (unknown)
6. Functional verification of Nurse Call relay (unknown)
7. Functional verification of battery charging and voltage (unknown)
8. Functional verification of patient isolation (unknown)

First check

Verify all monitor LEDs flash

Test point: Left panel, center panel, right panel LEDs
Expected: All LEDs flash continuously

23 more checks with pass and fail actions, 23 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

NIBP air leak exceeds limits patient safety

NIBP (non-invasive blood pressure) module leaks air

Ranked causes

1. Leaky check valve (common)
2. Leaky tubing or connector (common)
3. Leaky pump (occasional)
4. Leaky bleed or dump valve (occasional)

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

Calibration: NIBP leak test patient safety

Verify NIBP system for abnormal leakage using neonatal cuff at specified inflation pressures

Ranked causes

1. Leak in NIBP cuff (occasional)
2. Leak in NIBP hose or connections (occasional)
3. Leak in internal NIBP module (rare)

First check

Put monitor in Service mode

Test point: Power button and control buttons
Expected: Monitor in SERVICE MODE

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

Repeated C07 error code patient safety

SpO2 module repeatedly reports error C07

Ranked causes

1. Incompatible SpO2 sensor (common)
2. Faulty SpO2 sensor (common)
4. Faulty SpO2 board (rare)

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

Repeated C20 temperature error code patient safety

Temperature module repeatedly reports error C20

Ranked causes

1. Probe well not installed (common)
2. Faulty probe (common)
3. Faulty temperature board (occasional)

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

Repeated C04 error code patient safety

NIBP module repeatedly reports error C04

Ranked causes

1. NIBP internal tubing disconnected (common)
2. Faulty NIBP module (occasional)

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

Battery run time is low

Device battery does not provide adequate operating duration

Ranked causes

1. Defective battery (common)

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

Button requires excessive pressure

Buttons on right side require noticeably more force to actuate

Ranked causes

1. Display board mounting screws loose (common)

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

Calibration: Battery charging and voltage

Verify battery charging, runtime capability, and voltage

Ranked causes

1. Functional verification of battery charging and voltage (unknown)

First check

Verify AC mains indicator illuminated

Test point: Monitor front panel AC mains indicator
Expected: Flashing (charging) or steady (90% charged)

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

Calibration: Blood pressure cuff pressure accuracy patient safety

Verify that SYS display matches digital pressure meter readings at 80, 150, and 300 mmHg target pressures during functional verification

Ranked causes

1. Pressure transducer or software calibration drift (unknown)

First check

Verify SYS display at 80 mmHg target pressure

Test point: SYS window, digital pressure meter
Expected: Within 3 mmHg (0.4 kPa) of meter reading, 3 mmHg (0.4 kPa)
Tools: Digital pressure meter

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

Calibration: Blood pressure sensor accuracy at 150 mmHg

Verify systolic pressure reading accuracy at 150 mmHg (20 kPa) target against digital pressure meter

Ranked causes

1. Sensor calibration drift (unknown)

First check

Compare SYS display reading to digital pressure meter at 150 mmHg

Test point: SYS window and digital pressure meter
Expected: Within 3 mmHg (0.4 kPa) of meter reading, ±3 mmHg (±0.4 kPa)

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

Calibration: Blood pressure sensor accuracy at 300 mmHg

Verify systolic pressure reading accuracy at 300 mmHg (40 kPa) target against digital pressure meter

Ranked causes

1. Sensor calibration drift (unknown)

First check

Compare SYS display reading to digital pressure meter at 300 mmHg

Test point: SYS window and digital pressure meter
Expected: Within 6 mmHg (0.8 kPa) of meter reading, ±6 mmHg (±0.8 kPa)

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

Calibration: Blood pressure sensor accuracy at 80 mmHg

Verify systolic pressure reading accuracy at 80 mmHg (10.7 kPa) target against digital pressure meter

Ranked causes

1. Sensor calibration drift (unknown)

First check

Compare SYS display reading to digital pressure meter at 80 mmHg

Test point: SYS window and digital pressure meter
Expected: Within 3 mmHg (0.4 kPa) of meter reading, ±3 mmHg (±0.4 kPa)

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

Calibration: Cuff deflation rate

Verify deflation valve opens and pressure drops at specified rate from ~300 mmHg to <15 mmHg in 10 seconds

Ranked causes

1. Deflation valve stuck or blocked (unknown)

First check

Measure pressure drop over 10 seconds after selecting 0 mmHg

Test point: Manometer reading at 10-second mark
Expected: Less than 15 mmHg remaining, <15 mmHg
Tools: Manometer, timer

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

Calibration: Cuff inflation time from 5 to 250 mmHg

Verify pump inflation rate meets timing requirement when pressurizing from 5 mmHg to 250 mmHg

Ranked causes

1. Pump speed degradation or mechanical restriction (unknown)

First check

Time cuff inflation from 5 mmHg to 250 mmHg using manometer

Test point: Manometer and timer
Expected: Less than 8 seconds, <8 seconds
Tools: Timer, manometer

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

Calibration: Maximum allowable adult cuff pressure patient safety

Verify cuff cannot exceed 280 mmHg in adult mode even when manually pressurized beyond target

Ranked causes

1. Overpressure safety circuit malfunction (unknown)

First check

Attempt to pressurize cuff above 280 mmHg in ADULT mode

Test point: Cuff pressure (manometer or SYS display)
Expected: Pressure does not exceed 280 mmHg; dump valve opens; C10 displayed, ≤280 mmHg

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

Calibration: Maximum allowable cuff pressure (Adult mode) patient safety

Verify overpressure protection limits adult cuff pressure to 280 mmHg maximum before dump valve opens

Ranked causes

1. Software overpressure limit not enforced, or dump valve failure (unknown)

First check

Pressure at which dump valve opens in Adult mode

Test point: Manometer, SYS window, visual observation of dump valve action
Expected: Dump valve opens at 280 mmHg; pressure drops to approximately 0; C10 error displays, 280 mmHg

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

Calibration: Maximum allowable cuff pressure (Neonate mode) patient safety

Verify overpressure protection limits neonate cuff pressure to 141 mmHg maximum before dump valve opens

Ranked causes

1. Software overpressure limit not enforced for neonate mode, or dump valve failure (unknown)

First check

Pressure at which dump valve opens in Neonate mode

Test point: Manometer, SYS window, visual observation of dump valve action
Expected: Dump valve opens at 141 mmHg; pressure drops to approximately 0; C10 error displays, 141 mmHg

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

Calibration: Maximum allowable cuff pressure (Pediatric mode) patient safety

Verify overpressure protection limits pediatric cuff pressure to 200 mmHg maximum before dump valve opens

Ranked causes

1. Software overpressure limit not enforced for pediatric mode, or dump valve failure (unknown)

First check

Pressure at which dump valve opens in Pediatric mode

Test point: Manometer, SYS window, visual observation of dump valve action
Expected: Dump valve opens at 200 mmHg; pressure drops to approximately 0; C10 error displays, 200 mmHg

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

Calibration: Maximum allowable neonate cuff pressure patient safety

Verify cuff cannot exceed 141 mmHg in neonate mode even when manually pressurized beyond target

Ranked causes

1. Overpressure safety circuit malfunction (unknown)

First check

Attempt to pressurize neonate cuff above 141 mmHg in NEONATE mode

Test point: Cuff pressure (manometer or SYS display)
Expected: Pressure does not exceed 141 mmHg; dump valve opens; C10 displayed, ≤141 mmHg

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

Calibration: Maximum allowable pediatric cuff pressure patient safety

Verify cuff cannot exceed 200 mmHg in pediatric mode even when manually pressurized beyond target

Ranked causes

1. Overpressure safety circuit malfunction (unknown)

First check

Attempt to pressurize cuff above 200 mmHg in PEDIATRIC mode

Test point: Cuff pressure (manometer or SYS display)
Expected: Pressure does not exceed 200 mmHg; dump valve opens; C10 displayed, ≤200 mmHg

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

Calibration: NIBP characterization test patient safety

Verify NIBP module error code C03 appears during characterization using 35 mL syringe test volume

Ranked causes

1. NIBP module not properly characterized or calibrated (common)

First check

Attach neonate hose (part 008-0265-01) to NIBP fitting

Test point: NIBP fitting on monitor
Expected: Neonatal hose securely attached

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

Calibration: NIBP pump current

Measure pump current draw during inflation to verify pump operation and detect motor or drive circuit faults

Ranked causes

1. Pump motor fault or excessive current draw (unknown)

First check

Measure pump current rise during 80 mmHg inflation

Test point: Current meter, monitoring pump startup
Expected: Not more than 750 mA above baseline
Tools: Current meter

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

Calibration: NIBP pump deflation rate patient safety

Verify cuff deflates from approximately 300 mmHg to less than 15 mmHg within 10 seconds to ensure controlled pressure release

Ranked causes

1. Bleed valve partially stuck, or blockage in deflation path (unknown)

First check

Measure deflation pressure after 10 seconds from ~300 mmHg

Test point: Manometer, timer, SYS window
Expected: Less than 15 mmHg, < 15 mmHg
Tools: Timer, manometer

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

Calibration: NIBP pump inflation rate patient safety

Verify pump inflates cuff from 5 mmHg to 250 mmHg within 8 seconds to ensure adequate inflation speed

Ranked causes

1. Pump worn, leak in tubing/cuff connection, or pressure relief valve stuck open (unknown)

First check

Measure inflation time from 5 to 250 mmHg

Test point: Manometer, timer
Expected: Less than 8 seconds, < 8 sec
Tools: Timer, manometer

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

Calibration: Nurse Call relay

Verify Nurse Call relay contact resistance in alarm and non-alarm states

Ranked causes

1. Functional verification of Nurse Call relay (unknown)

First check

Measure Nurse Call relay resistance pins 1-2 (alarm OFF)

Test point: Nurse Call connector pins 1-2
Expected: > 1 MΩ
Tools: Ohmmeter

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

Calibration: Overpressure cutoff emergency safety (NIBP 4.20.00+) patient safety

Verify emergency overpressure cutoff stops pump and opens dump/bleed valves before pressure exceeds 280 mmHg in Adult mode

Ranked causes

1. Overpressure cutoff circuit or software failure (NIBP 4.20.00+) (unknown)

First check

Verify overpressure cutoff maximum pressure during rapid inflation

Test point: Digital pressure meter, SYS window, E40 error display
Expected: Pressure does not exceed 280 mmHg; E40 error displays; any button press shuts down monitor, ≤ 280 mmHg

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

Calibration: Overpressure cutoff emergency shutdown patient safety

Verify overpressure cutoff circuit prevents pressure exceeding 280 mmHg and triggers E40 error when manual bulb squeeze forces rapid pressure rise

Ranked causes

1. Overpressure cutoff circuit malfunction (unknown)

First check

Rapid pressurization triggers overpressure cutoff

Test point: Digital pressure meter and SYS display
Expected: Pressure ≤280 mmHg; E40 error; dump/bleed valves open, ≤280 mmHg
Tools: Digital pressure meter, monitor display

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

Calibration: Patient isolation high voltage

Verify patient isolation using AC Withstand Voltage hi-pot tester on all external connectors

Ranked causes

1. Functional verification of patient isolation (unknown)

First check

Test Nurse Call isolation current

Test point: Hi-pot tester current measurement
Expected: ≤ 2.50 mA (shielding sufficient)
Tools: AR 3605 or equivalent hi-pot tester

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

Calibration: Printer output and current draw

Verify printer produces legible settings report with no anomalies, missing, or faded sections; measure current draw during printing

Ranked causes

1. Printer paper depleted, printer motor or drive circuit fault, or excessive current draw (unknown)

First check

Print settings report and inspect output quality

Test point: Printed report, visual inspection
Expected: Report completes with no printed anomalies, missing sections, or faded text

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

Calibration: Pump current draw during 80 mmHg inflation

Verify pump motor current remains within specified limit during cuff inflation to 80 mmHg from 0 mmHg baseline

Ranked causes

1. Pump motor malfunction or excessive load (unknown)

First check

Measure highest current during inflation from 0 to 80 mmHg

Test point: Current meter during pump operation
Expected: Not more than 750 mA above baseline current, Maximum 750 mA above baseline
Tools: Current meter

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

Calibration: SpO2 monitor function (Masimo)

Verify SpO2 pulse rate and saturation percentage display accuracy using Masimo Tester REF 1593

Ranked causes

1. Functional verification of SpO2 monitoring circuit (Masimo) (unknown)

First check

Measure pulse rate and SpO2 with Masimo tester

Test point: Monitor display
Expected: Pulse rate 61 ± 1 bpm, saturation 81 ± 3%, ± 1 bpm

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

Calibration: SpO2 sensor with monitor

Verify SpO2 sensor and monitor function using BioTek Index2 simulator

Ranked causes

1. Functional verification of SpO2 sensor with monitor (unknown)

First check

Measure SpO2 with BioTek simulator

Test point: Monitor display
Expected: SpO2 saturation 94 ± 4%, ± 4 %

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

Calibration: Temperature monitor function

Verify temperature display accuracy using Welch Allyn Sure Temp Plus test key

Ranked causes

1. Functional verification of temperature monitor function (unknown)

First check

Measure temperature with test key

Test point: Monitor display
Expected: Temperature 97.3 ± 0.2 °F (36.3 ± 0.1 °C), ± 0.2 °F

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

Calibration: Temperature probe with monitor

Verify temperature probe accuracy using Welch Allyn Calibration Tester

Ranked causes

1. Functional verification of temperature probe with monitor (unknown)

First check

Measure temperature at 96.4 °F setpoint (9600 model)

Test point: Monitor display
Expected: 96.4 ± 0.4 °F (35.8 ± 0.2 °C), ± 0.4 °F

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

Erroneous LCD characters

LCD display showing corrupted or incorrect characters

Ranked causes

1. LCD partially connected to main board (common)

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

Error code E30

PROM memory corruption

Ranked causes

1. PROM memory corrupted (rare)

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

Error code E31

RAM memory test failure

Ranked causes

1. RAM test failure (occasional)

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

Error code E32

Factory data failure

Ranked causes

1. Factory data corrupted (rare)

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

Error code E33

User data error

Ranked causes

1. User settings corrupted (occasional)

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

Error code E34

A/D converter failure

Ranked causes

1. A/D converter malfunction (occasional)

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

Error code E35 patient safety

SpO2 module failure

Ranked causes

1. SpO2 module malfunction (occasional)

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

Error code E36

Temperature probe or module failure

Ranked causes

1. Faulty temperature probe (common)

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

Error code E37

Printer module failure

Ranked causes

1. Printer module malfunction (occasional)

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

Error code E38

Real-time clock failure

Ranked causes

1. Real-time clock malfunction (occasional)

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

Error code E40 patient safety

NIBP module failure

Ranked causes

1. NIBP module malfunction (occasional)

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

Error code E41 patient safety

NIBP module failure

Ranked causes

1. NIBP module malfunction (occasional)

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

Error code E44

POST queue overflow

Ranked causes

1. POST queue overflow (rare)

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

Front panel replacement required

Monitor requires front panel replacement

Ranked causes

1. Front panel failure (unknown)

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

Main board replacement required

Monitor requires main board replacement

Ranked causes

1. Main board failure (unknown)

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

Missing LED display

LED display on display board not illuminating

Ranked causes

1. LED failure on display board (occasional)

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

Monitor configuration incompatible after NIBP module replacement patient safety

Monitor unable to recognize or function with new NIBP (POEM) module until service utility updates monitor configuration

Ranked causes

1. NIBP module firmware version not registered in monitor configuration (common)

First check

Verify NIBP module installed has different firmware version than monitor expects

Test point: Service utility main screen, NIBP Module row under 'Installed Ver' and 'Update Ver'
Expected: Version numbers shown for old POEM and new POEM2 NIBP module differ

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

Monitor displays E35 error after temperature module replacement patient safety

E35 error appears on display when a new temperature module with different firmware version is installed without configuration update

Ranked causes

1. Temperature module firmware version not accepted by monitor (common)

First check

Verify if new temperature module firmware version differs from previously installed version

Test point: Service utility Update Monitor screen, Installed Version column
Expected: New firmware version shown in orange if different from last configured version

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

Monitor does not power up

Monitor fails to turn on or show display

Ranked causes

2. Wrong power adapter used (common)

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

NIBP air leak exceeds specified limits patient safety

Non-invasive blood pressure module has excessive air leakage

Ranked causes

1. Leaky check valve (common)

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

NIBP cuff overinflation after component replacement patient safety

NIBP module not properly characterized after replacing pump, air filter, check valve, tubing, or NIBP board; cuff could overinflate posing hazard to neonatal patients

Ranked causes

1. NIBP component replaced without characterization (common)

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

NIBP cuff overinflation hazard in neonatal patients patient safety

Risk of NIBP cuff overinflation causing injury to neonatal patients if NIBP module is not properly characterized after component replacement

Ranked causes

1. NIBP module not characterized after component replacement (common)

First check

Verify NIBP characterization was performed

Test point: Service Utility logs or monitor status display
Expected: Characterization completion record present and current

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

NIBP module characterization required patient safety

NIBP module must be characterized after component replacement to ensure proper cuff inflation and patient safety

Ranked causes

1. NIBP component replaced (pump, air filter, check valve, tubing, or NIBP board) (common)

First check

Verify NIBP characterization completed before returning monitor to service

Test point: NIBP module
Expected: Characterization procedure successfully completed using Service Utility

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

NIBP module replacement required patient safety

Monitor requires NIBP module replacement

Ranked causes

1. NIBP module failure (unknown)

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

NIBP module requires characterization after component replacement patient safety

NIBP characterization procedure must be performed after replacing pump, air filter, check valve, tubing, or NIBP board to ensure proper cuff inflation and prevent hazard to neonatal patients

Ranked causes

1. NIBP component replaced (pump, air filter, check valve, tubing, or NIBP board) (common)

First check

NIBP characterization completed using Monitor Service Utility

Test point: Monitor Service Utility
Expected: Characterization procedure successfully completed without errors

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

More symptoms

Printer replacement required
Repeated C03 error code
Software update required
SpO2 board replacement required
SpO2 side panel replacement required
Temperature board replacement required
Warning: Do not connect to patient in Service mode

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

Error codes

Code	Meaning	Trigger	Severity
`C03`	NIBP internal tubing is kinked or blocked	Air cannot flow through kinked tubing during measurement	warning
`C03`	NIBP module characterization successful; cuff overpressure condition detected or test sequence complete	Expected to appear during NIBP characterization test when cuff inflation reaches specified volume threshold	info
`C03`	NIBP characterization complete (success indicator)	NIBP module successfully characterizes against fixed volume test chamber	info
`C04`	Alarm condition indicator during Nurse Call relay verification test	Monitor enters alarm state after pump charges twice (approximately 10 seconds) during functional verification	info
`C04`	NIBP internal tubing is disconnected or faulty NIBP module	NIBP tubing disconnected from module or module failure	error
`C07`	SpO2 sensor incompatible, faulty, improperly connected, or faulty SpO2 board	SpO2 sensor not detected or communication failure	error
`C10`	Overpressure condition detected and cuff pressure dumped	Cuff pressure exceeds safe limits for selected mode (280 mmHg adult, 200 mmHg pediatric, 141 mmHg neonate)	warning
`C10`	Overpressure event occurred	Cuff pressure exceeded maximum allowable limit for patient mode (280 mmHg adult, 200 mmHg pediatric, 141 mmHg neonate)	warning
`C20`	Temperature probe well not installed, faulty probe, or faulty temperature board	Temperature measurement subsystem failure	error
`E30`	PROM is corrupt	PROM memory corruption detected	critical
`E31`	RAM test failure	RAM memory test failed	error
`E32`	Factory data failure	Factory calibration data corrupted	critical
`E33`	User data error	User settings data corrupted	warning
`E34`	A/D converter failure	Analog to digital converter malfunction	error
`E35`	Temperature module fault or incompatibility	New temperature module with different firmware version installed and monitor configuration not updated to accept it	error
`E35`	SpO2 module failure	SpO2 module communication or hardware failure	error
`E36`	Temperature module failure	Temperature module communication or hardware failure	error
`E37`	Printer failure	Printer module communication or hardware failure	error
`E38`	Real-time clock failure	Clock battery depleted or RTC malfunction	warning
`E38`	Power-on self-test error or initialization error	Displayed during or after power-on self-test sequence	error
`E38`	Temperature probe error or disconnection detected	When temperature probe is removed from probe well during initialization or when system detects probe fault	warning
`E40`	Emergency overpressure cutoff triggered; pump stopped and valves opened	Pressure rise rate exceeds cutoff threshold (rapid manual pressurization or pump malfunction)	critical
`E40`	Overpressure cutoff activated (NIBP 4.20.00+)	Pump pressure rise exceeds cutoff threshold (295-330 mmHg) during inflation; emergency safety feature activation	error
`E40`	NIBP module failure	NIBP module communication or hardware failure	error
`E41`	NIBP module failure	NIBP module communication or hardware failure	error
`E44`	POST queue full	Power-on self-test queue overflow	error

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.