Patient monitors

Nellcor Libra: troubleshooting and error codes

The ServiceForge knowledge base holds 55 documented symptoms for the Nellcor Libra, with 114 ranked causes, 128 diagnostic checks with test points and expected values, and 56 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Inaccurate pulse oximetry sensor measurement patient safety

SpO2 reading or pulse signal affected by sensor application, ambient conditions, or patient factors

Ranked causes

1. Incorrect sensor application (common)
2. Sensor placed on extremity with blood pressure cuff or line (common)
3. High ambient light (common)
4. Excessive patient activity (common)
5. Dark skin pigment or external coloring (occasional)
6. Poor peripheral perfusion (occasional)

First check

Verify sensor application

Test point: Sensor site
Expected: Sensor properly and securely applied per Directions for Use

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

Questionable readouts of patient physiological measurements patient safety

Patient data readings appear unreliable, inaccurate, or wrongly tagged; patient data missing from records.

Ranked causes

1. Sensor not attached correctly (common)
2. Faulty sensor (occasional)
3. Electromagnetic interference (occasional)
4. Ambient light interfering with proper sensing (occasional)
5. Coin cell battery was removed from Main board (rare)

First check

Verify sensor attachment and position

Test point: Sensor on patient and cable connections
Expected: Sensor properly attached and making good contact

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

USB data port does not function properly

USB data port connection fails or does not transfer data correctly to PC or external device.

Ranked causes

1. USB cable not firmly connected (common)
2. Covidien bridge driver corrupted (occasional)
3. Mismatched baud rates between monitoring system and PC (occasional)
4. Mismatched COM port between PC and HyperTerminal (occasional)
5. USB port damaged (rare)

First check

Verify USB cable connection

Test point: USB cable and port connections
Expected: Cable fully inserted and firmly seated

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

No SpO2 level or pulse rate displayed patient safety

Device cannot obtain SpO2 measurement or pulse rate; sensor message occurs

Ranked causes

1. Sensor not connected firmly (common)
2. Incompatible or defective sensor (occasional)
3. Extended or non-approved cable used (occasional)
4. High ambient light interference (occasional)

First check

Verify sensor cable connection at sensor port

Test point: Pulse oximetry sensor port on front panel and sensor connector
Expected: Cable firmly seated in port and connected to sensor

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

Pulse signal loss patient safety

Loss-of-pulse signal detected; no signal reaching monitor

Ranked causes

1. Sensor applied too tightly (common)
2. Blood pressure cuff inflation on same extremity (common)
3. Arterial occlusion proximal to sensor (rare)
4. Poor peripheral perfusion (occasional)

First check

Assess sensor tightness

Test point: Sensor site
Expected: Sensor firmly applied but not occluding circulation

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

System consumes battery power with AC connected

Monitoring system drains battery power even when AC power cord is connected.

Ranked causes

1. AC power cord not properly seated (common)
2. Faulty power source (occasional)
3. Faulty power cord (occasional)
4. Charger board or Power board malfunction (rare)

First check

Verify AC power cord connections

Test point: Power cord at wall outlet and device inlet
Expected: Both connections fully seated

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

Battery Charge Indicator not lit

Battery charge indicator light does not illuminate when power is connected.

Ranked causes

1. AC power cord disconnected (common)
2. Battery missing or defective (occasional)
3. Failed charger (occasional)

First check

Verify AC power connection

Test point: AC power cord and wall outlet
Expected: AC cord fully connected at both ends

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

Date and time incorrect on LCD and in trend data download patient safety

System displays incorrect date and time on LCD screen and in downloaded trend data.

Ranked causes

1. Date and time not set correctly during installation (common)
2. Coin cell battery depleted or removed (occasional)
3. Coin cell battery tab does not provide firm contact (rare)

First check

Check current date/time setting

Test point: SERVICE Menu date/time display
Expected: Date and time set correctly per facility locale format

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

Display does not function properly or looks distorted

LCD display shows distorted image, garbled text, or improper rendering of information.

Ranked causes

1. Electromagnetic interference (occasional)
2. LCD cable disconnected or improperly connected (common)
3. Main board is malfunctioning (rare)

First check

Identify and isolate EMI sources

Test point: Equipment in vicinity of monitor
Expected: No active electrosurgical devices or cell phones nearby

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

Inaccurate SpO2 measurements patient safety

SpO2 reading does not match expected clinical value or varies unexpectedly

Ranked causes

1. Patient physiological interference (common)
2. Sensor applied too tightly or left too long on one site (occasional)
3. High ambient light conditions (occasional)

First check

Inspect sensor site for skin integrity and correct positioning

Test point: Applied sensor site on patient
Expected: Intact skin, appropriate tension, secure adhesion, proper positioning per Directions for Use

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

Message: Abnormally shut down last time

System displays message indicating abnormal shutdown occurred on previous operation.

Ranked causes

1. System opened and harnesses disconnected (occasional)
2. Depleted battery (occasional)
3. Battery disconnected while powered on (occasional)

First check

Power cycle system and verify POST

Test point: System startup sequence
Expected: Normal POST completion without error messages

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

No sound during POST

Speaker produces no audio output during power-on self-test sequence.

Ranked causes

1. Speaker harness loose or disconnected (common)
2. Speaker is malfunctioning (occasional)
3. Main board is malfunctioning (rare)

First check

Verify speaker connector seating

Test point: Speaker connector on Main board
Expected: Connector fully engaged and seated

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

Nurse call system connection failure patient safety

Nurse call port does not successfully communicate alarm to nurses' station

Ranked causes

1. Nurse call cable not properly connected (common)
2. Nurse call system not responding to alarm (occasional)
3. Audible alarm turned off (common)

First check

Verify audible alarm is enabled

Test point: Monitoring system audible alarm setting
Expected: Audible alarm enabled

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

Power system not operating correctly patient safety

Monitoring system does not power on, Battery Charge Indicator does not light, or system does not turn off properly

Ranked causes

1. AC power not connected or power source faulty (common)
2. Battery not charging or Battery Charge Indicator malfunction (occasional)
3. Power button stuck or unresponsive (rare)

First check

Verify AC power connection and Battery Charge Indicator status

Test point: Battery Charge Indicator LED
Expected: Lit (amber/yellow) when connected to AC power

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

SpO2 sensor messages or disconnection patient safety

System displays sensor-related messages including SpO2 Pulse Search, Sensor Off, Cable Disconnect, or Signal Artifact Detected messages.

Ranked causes

1. Sensor disconnected from cable or monitoring system (common)
2. Sensor detached from patient (common)
3. Unable to get reliable readings due to skin contamination or motion (common)

First check

Verify sensor and cable connections

Test point: Sensor connector and cable connections at device
Expected: All connections fully seated and secure

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

System does not power on with battery only

Monitoring system does not turn on when Power On/Off button is pressed with battery power only.

Ranked causes

1. Power On/Off button not held long enough (common)
2. Battery not properly seated (occasional)
3. Battery depleted or defective (common)

First check

Verify button press duration

Test point: Power On/Off button
Expected: Button held for 2 seconds minimum

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

System does not respond to Power On/Off button with AC and battery

Monitoring system with battery installed and connected to AC power does not respond when Power On/Off button is pressed.

Ranked causes

1. Power On/Off button not held long enough (common)
2. Failed Power board (rare)
3. AC power interference (occasional)

First check

Verify button press duration

Test point: Power On/Off button
Expected: Button held for 2 seconds minimum

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

Alarm audio pause function not working

Audio paused button does not silence alarm tone or alarm does not remain silent for set interval

Ranked causes

1. Audio pause interval not properly configured in SERVICE Menu (common)
2. Audio pause button hardware or firmware malfunction (occasional)

First check

Audio pause interval configuration

Test point: SERVICE Menu AUDIO ALARM PAUSED setting
Expected: 30 seconds

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

Alarm audio reminder not sounding

Alarm audio reminder tone does not sound after configured interval when alarms are disabled

Ranked causes

1. Audio reminder interval not properly set in SERVICE Menu (common)
2. Firmware or audio circuit malfunction (rare)

First check

Audio reminder interval setting

Test point: SERVICE Menu ALARM AUDIO REMINDER setting
Expected: 3 minutes

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

Alarm volume cannot be adjusted

Alarm volume dots do not change or alarm tone volume does not vary with volume setting selection

Ranked causes

1. Alarm volume control circuit malfunction (occasional)
2. Audio amplifier failure (rare)

First check

Alarm volume setting display

Test point: OPTIONS Menu Volume Alarm Volume screen
Expected: Dots display from 1 to 8, default 5

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

Audio alarm does not pause for specified time

Audio alarm pauses for incorrect duration compared to institutional default settings configured in the system.

Ranked causes

1. Institutional defaults not set correctly (occasional)
2. Audio Paused button activator on Main board malfunctioning (rare)

First check

Verify institutional defaults setting

Test point: SERVICE Menu default settings
Expected: Pause duration matches institutional requirement

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

Battery status not indicated correctly during battery operation

Battery charge level indicator does not display correctly when operating on battery power.

Ranked causes

1. Battery is defective (occasional)
2. Main CPU or sub-CPU failure (rare)

First check

Verify battery installation and condition

Test point: Battery compartment and battery
Expected: Battery properly installed and functional

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

Blank display after normal POST

LCD display remains blank or inactive after successful power-on self-test.

Ranked causes

1. LCD cable disconnected (common)
2. LCD is damaged (occasional)

First check

Verify LCD cable connection

Test point: LCD connector on Main board
Expected: Cable fully seated and secured

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

Calibration: Automatic wavelength and LED intensity adjustment

System automatically selects coefficients for red LED wavelength and adjusts LED light intensity to compensate for tissue thickness variations during SpO2 measurement

Ranked causes

1. LED wavelength variation between sensors (common)
2. Tissue thickness differences affecting light intensity (common)

First check

Observe plethysmographic waveform during automatic calibration

Test point: Display
Expected: Waveform may briefly display flat line during calibration

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

Firmware download error or technical system error

Error code starting with 'E' appears on LCD display indicating firmware or system error.

Ranked causes

1. Firmware not loading correctly (occasional)
2. Monitoring system is malfunctioning (rare)

First check

Record exact error code displayed

Test point: LCD error code display
Expected: Error code clearly visible and readable

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

Key beep volume cannot be adjusted

Key beep tone does not vary in volume when selection dial is used or volume control does not respond

Ranked causes

1. Key beep volume control not properly configured (common)
2. Audio output circuit malfunction (occasional)

First check

Key beep volume setting display

Test point: OPTIONS Menu Volume Key Beep Volume screen
Expected: Dots display from 1 to 7, default 4

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

Low or critically low battery condition

Battery charge is depleted or critically low during battery-powered operation.

Ranked causes

1. Monitoring system run on battery for full lifespan (common)
2. Battery not recharging (occasional)

First check

Assess battery usage time

Test point: System operation duration on battery
Expected: Within expected battery life for model

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

Monitoring system is frozen patient safety

System does not respond to input and operation is halted.

Ranked causes

1. Reset needed (common)
2. Main board malfunction (rare)

First check

Attempt forced system reset

Test point: Power On/Off button
Expected: System powers off after 15 seconds

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

No response when control buttons are pressed

Control buttons on front panel do not respond to user input; system does not recognize button presses.

Ranked causes

1. Possible misplacement of buttons (occasional)
2. Button activators on Main board malfunctioning (rare)

First check

Verify button placement in bezel

Test point: Front panel button positions
Expected: All 3 buttons properly positioned in bezel housing

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

Pulse tone volume cannot be adjusted

Pulse tone does not sound with heartbeats or volume cannot be varied between settings

Ranked causes

1. Pulse volume control not properly configured or enabled (common)
2. Heart rate detection or pulse output circuit malfunction (occasional)

First check

Pulse tone sounds with heartbeats

Test point: Monitor speaker and heart rate detection
Expected: Pulse tone audible with each detected heartbeat

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

SpO2 and pulse rate values unstable or unreasonable patient safety

Oxygen saturation and pulse rate readings do not stabilize or show abnormal values when sensor applied to live subject

Ranked causes

1. Sensor not properly attached or patient movement (common)
2. Signal processing or sensor malfunction (occasional)

First check

System stabilization time

Test point: Monitor display
Expected: SpO2 and PR values stabilize within 15 to 30 seconds

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

System does not respond to jog dial operation

Jog dial control input does not produce any response or navigation change in the system.

Ranked causes

1. Jog dial is malfunctioning (occasional)
2. Encoder on Main board is malfunctioning (rare)

First check

Visually inspect jog dial

Test point: Jog dial control
Expected: No visible damage or stuck condition

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

Audio alarm cannot be paused

Audio alarm output cannot be silenced or paused by pressing the audio pause button.

Ranked causes

1. Main board is malfunctioning (rare)

First check

Press Audio Paused button

Test point: Audio Paused button control
Expected: Alarm pauses or silences when button pressed

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

Battery charge time excessive

Battery Charge Indicator does not change to green within expected timeframe or battery not fully charging

Ranked causes

1. Battery requires complete charge/discharge cycle to restore capacity (occasional)

First check

Verify battery charge time and indicator status

Test point: Battery Charge Indicator LED and charging time
Expected: Indicator changes to green: 4 hours for 5-hour battery, 8 hours for 10-hour battery

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

Battery charge time not reaching completion

Battery Charge Indicator does not change to green within expected timeframe during charging

Ranked causes

1. Battery requires complete charge/discharge cycle to restore normal capacity (occasional)

First check

Monitor Battery Charge Indicator color during charging

Test point: Battery Charge Indicator
Expected: Green after charging completion hours, 4 hours for 5-hour battery; 8 hours for 10-hour battery

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

Button press does not emit tone patient safety

Pressing Power On/Off button or other buttons produces no audible tone (neither valid nor invalid tone)

Ranked causes

1. Speaker failure or audio circuit malfunction (unknown)

First check

Press Power On/Off button and listen for tone

Test point: Speaker output
Expected: Audible tone (either valid or invalid)

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

Buzzer sounds during POST, EEE910 indicated on LCD

System emits buzzing sound during POST and displays error code EEE910 on LCD screen.

Ranked causes

1. CPU is malfunctioning (rare)

First check

Disconnect speaker and retry POST

Test point: Speaker connector and Main board
Expected: POST completes without buzzing or EEE910 error

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

Coin cell battery replacement patient safety

Date and time settings reset after replacing the coin cell battery on the Main board; patient data integrity may be compromised

Ranked causes

1. Coin cell battery depleted or removed (unknown)

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

Earth leakage current exceeds limit high voltage

Electrical safety analyzer detects excessive leakage current from device chassis to earth ground during IEC60601-1 earth leakage test

Ranked causes

1. Power supply leakage or insulation degradation (unknown)

First check

Measure earth leakage current in normal condition

Test point: AC power ground path
Expected: 500 microamps or less
Tools: Electrical safety analyzer

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

Enclosure leakage current exceeds limit high voltage

Electrical safety analyzer detects excessive ungrounded enclosure current between case and earth during IEC60601-1 enclosure leakage test

Ranked causes

1. Case insulation or shielding degradation (unknown)

First check

Measure enclosure leakage current in normal condition

Test point: Enclosure to earth
Expected: 100 microamps or less
Tools: Electrical safety analyzer, foil

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

Indicator or display element does not light patient safety

One or more display indicators or elements fails to illuminate during power-on

Ranked causes

1. Display or indicator failure (unknown)

First check

Observe all indicators and display elements during POST

Test point: Software version display, SpO2 alarm indicator, pulse rate alarm indicator
Expected: All indicators light for approximately 2 seconds

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

LCD visibly cracked or broken

LCD display panel shows visible physical damage including cracks or breaks.

Ranked causes

1. Physical damage to LCD (common)

First check

Inspect LCD for cracks or damage

Test point: LCD display panel surface
Expected: No visible cracks, breaks, or physical damage

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

LED intensity not controlled properly

LED brightness does not modulate as sensor clip opens/closes, indicating microprocessor control failure

Ranked causes

1. Microprocessor not controlling LED intensity (unknown)

First check

LED brightness when sensor fully open

Test point: Adult finger sensor
Expected: Brightly lit

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

Nurse call port resistance incorrect

Resistance measurements between nurse call port pins do not match expected values for the system state

Ranked causes

1. Nurse call port malfunction or connector fault (unknown)

First check

Measure resistance between pins 2 and 3 when system is powered off

Test point: Nurse call connector pins 2 and 3
Expected: Open

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

Patient leakage current exceeds limit patient safety

Electrical safety analyzer detects excessive leakage from patient connection (SpO2 sensor) to earth ground

Ranked causes

1. Patient connector insulation degradation or internal leakage (unknown)

First check

Measure patient leakage current in normal condition

Test point: SpO2 sensor to earth
Expected: 10 microamps or less
Tools: Electrical safety analyzer, test cable

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

Patient leakage current with mains voltage exceeds limit patient safety

Electrical safety analyzer detects excessive leakage when 110% mains voltage is applied between patient connection and earth

Ranked causes

1. Patient connector isolation failure under fault voltage (unknown)

First check

Measure patient leakage current with mains voltage, normal polarity

Test point: SpO2 sensor to earth
Expected: 50 microamps or less
Tools: Electrical safety analyzer, test cable

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

POST takes longer than expected to complete

POST sequence duration exceeds normal time

Ranked causes

1. Normal POST duration variance (occasional)

First check

Time the POST sequence duration

Test point: From Power On/Off button press to main monitoring screen display
Expected: Approximately 13 seconds

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

Power-On Self-Test (POST) fails or displays error

Error message appears during POST sequence instead of completing normally with pass tone and main monitoring screen

Ranked causes

1. POST sequence interrupted or incomplete (unknown)

First check

Verify AC power connection and indicators

Test point: AC power source, AC Indicator, Battery Charge Indicator
Expected: AC Indicator and Battery Charge Indicator are lit

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

Pulse rate alarm limit adjustment needed patient safety

Caregivers need to adjust pulse rate (PR) alarm thresholds. Display flashes on yellow background when pulse rate is outside alarm limits. Rates outside 20-250 bpm range displayed as 0 or 250.

Ranked causes

1. Pulse rate alarm limits require adjustment per patient needs (common)

First check

Verify current pulse rate alarm limit settings displayed as smaller values

Test point: Pulse Rate (PR) numerical area
Expected: Current upper and lower alarm limit settings visible to left of dynamic pulse rate value

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

SatSeconds alarm option configuration patient safety

SatSeconds alarm option manages frequency of SpO2 alarm limit violations. Higher value setting results in less frequent alarms.

Ranked causes

1. SpO2 alarm frequency requires adjustment using SatSeconds setting (occasional)

First check

Confirm SatSeconds alarm option is available in ALARM LIMITS Menu

Test point: ALARM LIMITS Menu options
Expected: SatSeconds Alarm option present in menu selection

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

SatSeconds alarm triggers during SpO2 desaturation patient safety

Patient SpO2 drops 10% below lower alarm threshold (85% to 75%) and remains below threshold for 2.5 seconds, triggering SatSeconds alarm when limit is set to 25

Ranked causes

1. SpO2 saturation below alarm threshold for duration exceeding SatSeconds limit (common)

First check

Verify SpO2 value relative to lower alarm threshold

Test point: Patient SpO2 reading
Expected: SpO2 above lower alarm threshold (e.g., >85% if threshold set to 85%)

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

Speaker does not sound during power-on patient safety

POST pass tone is inaudible after pressing Power On/Off button; alarm warning sounds remain inaudible

Ranked causes

1. Speaker obstructed or blocked (common)

First check

Verify speaker is unobstructed and clean

Test point: Speaker outlet
Expected: Speaker free of debris and blockage

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

SpO2 alarm limit adjustment needed patient safety

Caregivers need to adjust SpO2 alarm thresholds from default values. Changes take effect until modified again or power cycle occurs. SpO2 value flashes on yellow background when saturation is outside alarm limits.

Ranked causes

1. SpO2 alarm limits require adjustment per patient needs (common)

First check

Verify current SpO2 alarm limit settings displayed as smaller values

Test point: SpO2 numerical area
Expected: Current upper and lower alarm limit settings visible to left of dynamic SpO2 value

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

SpO2 and pulse rate alarm inhibition patient safety

Option to inhibit audible alarms for SpO2 and/or pulse rate alarm limit violations while maintaining visual monitoring.

Ranked causes

1. Alarm inhibition required per clinical protocol (occasional)

First check

Verify alarm inhibit icon is accessible in ALARM LIMITS Menu

Test point: ALARM LIMITS Menu
Expected: Alarm inhibit icon available for SpO2 and pulse rate selection

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

System does not power on with AC power only

Monitoring system does not turn on when Power On/Off button is pressed with AC power connected but no battery installed.

Ranked causes

1. No battery installed (common)

First check

Verify battery installation

Test point: Battery compartment
Expected: Battery installed and properly seated

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

Error codes

Code	Meaning	Trigger	Severity
`E.00.0001`	USB not recognized during firmware download	Firmware download initiated with USB connection not properly recognized	error
`E.00.0002`	Section.muf file corrupt or not found	Firmware download process cannot locate or verify Section.muf file integrity	error
`E.00.0003`	Ver.muf file corrupt or not found	Firmware download process cannot locate or verify Ver.muf file integrity	error
`E.00.0004`	Update.muf file corrupt or not found	Firmware download process cannot locate or verify Update.muf file integrity	error
`E.00.0005`	Binary file corrupt or not found	Firmware download process cannot locate or verify firmware binary file integrity	error
`E.01.0003`	Boot download failed	System failed to download boot firmware to memory	error
`E.01.0005`	Burn boot failed	System failed to write (burn) boot firmware to Flash memory	error
`E.01.0007`	Boot data between SDRAM and FLASH do not match	Data verification after firmware download found mismatch between RAM and Flash storage	error
`E.02.0003`	Main download failed	System failed to download main firmware to memory	error
`E.02.0005`	Burn main failed	System failed to write (burn) main firmware to Flash memory	error
`E.02.0007`	Main data between SDRAM and FLASH do not match	Data verification after firmware download found mismatch between RAM and Flash storage	error
`EEE001`	SpO2 module RAM error	SpO2 sensor module detected error in RAM during self-test or operation	error
`EEE002`	SpO2 module ROM/code integrity error	SpO2 sensor module detected error in firmware or program code integrity	error
`EEE003`	SpO2 module bad CRC in communications	SpO2 sensor module detected cyclic redundancy check error in communication data	error
`EEE004`	SpO2 module bad communication message	SpO2 sensor module received malformed or invalid communication message	error
`EEE005`	SpO2 module communication error; incorrect value	SpO2 sensor module communication returned unexpected or out-of-range value	error
`EEE006`	SpO2 module calibration (offset) failure	SpO2 sensor module calibration procedure failed during initialization	error
`EEE009`	SpO2 module syntax communication error	SpO2 sensor module detected syntax error in received communication data	error
`EEE010`	SpO2 module sensor error	SpO2 sensor module detected error condition in sensor itself during operation	error
`EEE012`	SpO2 module other hardware problem	SpO2 sensor module detected unspecified hardware error condition	error
`EEE017`	SpO2 module indicator that sensor appears defective	SpO2 sensor module detected characteristics suggesting sensor is defective or malfunctioning	warning
`EEE050`	SpO2 module intermittent error	SpO2 sensor module detected intermittent fault condition during operation	warning
`EEE051`	SpO2 module digital communication error	SpO2 sensor module detected error in digital communication protocol or line	error
`EEE255`	SpO2 module invalid jumper selection	SpO2 sensor module detected invalid jumper configuration during initialization	error
`EEE256`	SpO2 module beginning of packet missing	SpO2 sensor module received communication packet without proper start marker	error
`EEE257`	SpO2 module packet start (SID) missing	SpO2 sensor module received packet without start ID (SID) field	error
`EEE258`	SpO2 module packet length error	SpO2 sensor module received packet with incorrect or mismatched length field	error
`EEE259`	SpO2 module message length error	SpO2 sensor module received message with incorrect length field or data	error
`EEE260`	SpO2 module packet contains unsupported key	SpO2 sensor module received packet with command or key not supported by module firmware	warning
`EEE261`	SpO2 module packet CRC error	SpO2 sensor module detected cyclic redundancy check error in packet data	error
`EEE262`	SpO2 module end of packet missing	SpO2 sensor module received packet without proper end marker or terminator	error
`EEE263`	SpO2 module packet contains undefined key	SpO2 sensor module received packet with unrecognized command or data key	warning
`EEE264`	SpO2 module corrupted variable	SpO2 sensor module detected data corruption in module variable or memory location	error
`EEE265`	SpO2 module memory overflow	SpO2 sensor module memory allocation exceeded available space	error
`EEE266`	SpO2 module bad pointer	SpO2 sensor module detected invalid memory pointer or address during operation	error
`EEE267`	SpO2 module parameter value out of range	SpO2 sensor module received or generated parameter value outside acceptable limits	warning
`EEE268`	SpO2 module reset detected	SpO2 sensor module detected unexpected reset or restart during normal operation	warning
`EEE269`	SpO2 module unexpected value	SpO2 sensor module received value inconsistent with expected data or state	warning
`EEE270`	SpO2 module time out	SpO2 sensor module operation timed out waiting for expected event or response	warning
`EEE271`	SpO2 module not ready/not initialized	SpO2 sensor module not properly initialized or not ready for operation	warning
`EEE272`	SpO2 module double fault	SpO2 sensor module detected multiple simultaneous fault conditions	critical
`EEE273`	SpO2 module data out of range error	SpO2 sensor module measured or received data value outside valid sensor range	error
`EEE274`	SpO2 module incompatible digital sensor	SpO2 module detected digital sensor that is incompatible with module firmware	error
`EEE275`	SpO2 module incorrect registration number	SpO2 sensor module detected sensor with incorrect or mismatched registration identification	error
`EEE276`	SpO2 module sensor read failure	SpO2 module unable to read data from connected sensor during operation	error
`EEE277`	SpO2 module sensor signature verification failure	SpO2 module unable to verify or authenticate sensor identity and credentials	error
`EEE281`	SpO2 module overflow/underflow	SpO2 module internal buffer or calculation resulted in data overflow or underflow condition	error
`EEE282`	SpO2 module sensor activation failure	SpO2 module unable to activate or initialize sensor connection	error
`EEE283`	SpO2 module sensor write failure	SpO2 module unable to write data to sensor memory or configuration	error
`EEE284`	SpO2 module both HW and SW ECG triggers received	SpO2 module received conflicting hardware and software ECG trigger signals simultaneously	warning
`EEE285`	SpO2 module host attempted read/close of sensor trend before successful open	SpO2 module received read or close command for sensor trend data file not yet opened	warning
`EEE286`	SpO2 module host attempted redundant open of sensor trend	SpO2 module received second open command for sensor trend data file already open	warning
`EEE287`	SpO2 module sensor trend data unavailable for reading by host	Host system requested sensor trend data that is not available or accessible	warning
`EEE288`	SpO2 module no more sensor trend data available for reading by host	Host system has read all available sensor trend data and reached end of data	info
`EEE289`	SpO2 module sensor private label/host sensor key incompatible	SpO2 module detected incompatibility between sensor private label and host system key	error
`EEE804`	SpO2 module communication error	SpO2 sensor module detected general communication error during operation	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.