Patient monitors · CARESCAPE family

GE Healthcare E-musb: troubleshooting and error codes

The ServiceForge knowledge base holds 47 documented symptoms for the GE Healthcare E-musb, with 54 ranked causes, 39 diagnostic checks with test points and expected values, and 8 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Module not communicating or parameters not displaying

Module connected but no parameters shown, messages in display field, or module communication failing

Ranked causes

1. Module not connected to monitor (common)
2. Module not compatible with monitor system (occasional)
3. Parameters not configured or set to inactive (occasional)
4. Accessory malfunction or incompatibility (occasional)

First check

Verify monitor power and module connection

Test point: Monitor and module physical connections
Expected: Monitor powered on, module firmly connected

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

CO2 device failure

Alarm area message indicates device startup or communication failure with error codes

Ranked causes

1. Front end processor startup failure (error 0x108F) (rare)
2. Incorrect initialization (error 0x124F) (rare)
3. No keep alive response (error 0x128F) (rare)

First check

Reconnect CARESCAPE CO2 device

Test point: Device connector and interface
Expected: Device recognized and responsive

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

CO2 device malfunction

Alarm area or parameter window message indicates startup/runtime failure or software download mode

Ranked causes

1. CARESCAPE CO2 Microstream startup or runtime failure (occasional)
2. Device in software download mode (rare)

First check

Reconnect CARESCAPE CO2 device

Test point: Device connector and interface
Expected: Device initializes successfully

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

E-musb faulty device in port X patient safety

Alarm 'E-musb faulty device in port X' indicates overcurrent condition on E-musb port A or B

Ranked causes

1. Defective CARESCAPE Parameter cable in indicated port (common)
2. Hardware failure in E-musb module (occasional)

First check

Test E-musb port with known-good CARESCAPE Parameter

Test point: E-musb port A or B
Expected: Overcurrent condition clears, device recognized

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

Acquiring rSO2 signal

System is actively acquiring the rSO2 signal from the patient

Ranked causes

1. Normal signal acquisition in progress (common)

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

Apnea alarm deactivated

Parameter window message indicates apnea detection not active

Ranked causes

1. Apnea alarm start-up conditions not met (common)

First check

Monitor for respiratory breaths

Test point: CO2 waveform display
Expected: Three or more breaths detected

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

Auto detecting source

Waveform area message indicates automatic source detection in progress

Ranked causes

1. Automatic gas measurement source detection ongoing (common)

First check

Monitor auto-detection progress

Test point: Parameter window display
Expected: Detection completes and message clears

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

Calibrating

Parameter window message indicates calibration in progress

Ranked causes

1. Calibration in progress (common)

First check

Monitor calibration progress

Test point: Parameter window display
Expected: Calibration completes successfully

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

Calibration error

Parameter window message indicates unsuccessful calibration

Ranked causes

1. Unsuccessful calibration (occasional)

First check

Verify calibration gas type

Test point: Calibration gas canister
Expected: Specified calibration gas in use

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

Calibration required

Parameter window message indicates CO2 device needs calibration

Ranked causes

1. CARESCAPE CO2 Microstream needs calibration (common)

First check

Access calibration menu

Test point: Monitor interface menu
Expected: Service Calibrations option accessible

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

Calibration: CARESCAPE CO2 gas measurement patient safety

Gas calibration required to maintain measurement accuracy for CO2 airway parameter device

Ranked causes

1. Gas calibration overdue or not performed per schedule (occasional)

First check

Verify calibration schedule compliance

Test point: Device operating hours counter
Expected: Calibration performed within 1200 hours/1 year of installation, then every 4000 hours/1 year

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

Calibration: Gas measurement (CARESCAPE CO2 – Microstream) patient safety

Periodic calibration of airway gas measurement device to maintain measurement accuracy

Ranked causes

1. Gas calibration due at scheduled interval (common)

First check

Check calibration schedule: initial calibration due

Test point: Operating hours or installation date
Expected: 1200 operating hours after installation or one year after installation, whichever comes first

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

Calibration: Power frequency setting patient safety

Monitor power line frequency must match AC input to avoid affecting ECG, EEE, and rSO2 signal quality

Ranked causes

1. Power frequency setting does not match AC line input frequency (common)

First check

Verify power line frequency setting matches local AC input

Test point: Configuration > Power Frequency menu
Expected: Frequency matching local AC power supply

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

Check device - rSO2 malfunction patient safety

Hardware or software fault detected in CARESCAPE rSO2; no rSO2 signal detected

Ranked causes

1. rSO2 device malfunction or disconnection (unknown)

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

Check gas flow

Alarm area or parameter window message indicates abnormal sample flow rate

Ranked causes

1. Sample flow rate abnormal due to obstruction or leak (common)

First check

Inspect gas exhaust pathway

Test point: Sample line and exhaust tubing
Expected: No visible blockages or disconnections

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

Check rSO2 labels after patient transport patient safety

rSO2 measurement continues after patient transport; channel labels may be misaligned

Ranked causes

1. Channel labels misassociated with sensors after transport (common)

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

CO2 inaccurate

Alarm area message indicates measured values outside range or inaccurate

Ranked causes

1. Measured values outside range or inaccurate due to high respiration rate (occasional)

First check

Verify calibration gas levels

Test point: Calibration gas canister gauge
Expected: Adequate gas pressure remaining

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

CO2 measurement over range

Parameter or waveform area message indicates value outside measurable range

Ranked causes

1. CO2 value outside measurable range (rare)

First check

Verify CO2 value validity

Test point: Parameter display value
Expected: Value within measurable range

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

CO2 measurement purging

Alarm area or parameter window message indicates self-cleaning in progress

Ranked causes

1. CARESCAPE CO2 Microstream self-cleaning blockage in sample line (common)

First check

Inspect sample line

Test point: Sample tubing from sensor to device
Expected: No visible blockages or obstructions

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

CO2 measurement removed

Alarm area message indicates device disconnected from E-musb

Ranked causes

1. CARESCAPE CO2 Microstream disconnected from E-musb (common)

First check

Verify device connection

Test point: CO2 device interface connector
Expected: Device physically connected to E-musb

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

CO2 sensor overheated caution

Alarm area message indicates sensor temperature too high and device shutdown

Ranked causes

1. CARESCAPE CO2 Microstream sensor temperature too high (occasional)

First check

Check device placement and ventilation

Test point: CARESCAPE CO2 device position and surroundings
Expected: Device in open location, not covered or blocked

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

Continuous blockage in sample line

Waveform area message indicates sample line blocked

Ranked causes

1. CARESCAPE CO2 Microstream sampling line is blocked (common)

First check

Inspect sample line for blockages

Test point: Entire sample line path from patient to device
Expected: Clear unobstructed path for gas flow

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

E-musb disabled with CARESCAPE ONE connected patient safety

Alarm displays 'E-musb disabled. Connect parameters to CS ONE.' E-musb measurement stops or fails to start.

Ranked causes

1. CARESCAPE Parameter connected to E-musb while CARESCAPE ONE active (common)

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

E-musb faulty port detected

E-musb reports a fault on port A or B, preventing normal operation

Ranked causes

1. Internal E-musb hardware error, dirty connectors, or defective CARESCAPE Parameter (unknown)

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

E-musb module error patient safety

Alarm 'E-musb module error' indicates hardware error with E-musb module

Ranked causes

1. E-musb module hardware failure or loose connection (common)

First check

Verify E-musb module connection

Test point: E-musb module connector
Expected: Module fully seated and connected

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

E-musb unknown device in port X patient safety

Alarm 'E-musb unknown device in port X' indicates incompatible parameter or USB hub connected to E-musb port A or B

Ranked causes

1. Incompatible CARESCAPE Parameter or USB hub device connected (common)

First check

Verify connected device type and compatibility

Test point: E-musb port A or B
Expected: CARESCAPE CO2—Microstream or CARESCAPE rSO2 connected

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

Identical CO2 device detected

Alarm area message indicates multiple CARESCAPE CO2 Microstream devices in system

Ranked causes

1. More than one CARESCAPE CO2 Microstream in the system (error 0x110F) (rare)

First check

Verify connected CO2 devices

Test point: System device inventory
Expected: Only one CARESCAPE CO2 Microstream connected

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

Identical E-musb modules detected

System reports multiple E-musb modules present simultaneously

Ranked causes

1. Multiple E-musb modules installed (common)

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

Incompatible rSO2 device

Connected CARESCAPE rSO2 is not compatible with the system

Ranked causes

1. Incompatible rSO2 device installed (occasional)

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

Physical damage to CARESCAPE CO2 Microstream module caution

Visual damage including cracks, breaks, dirt, loose connectors, corrosion, bent pins, leakages or fluid contamination

Ranked causes

1. Physical damage from handling or transport (unknown)

First check

Visual inspection for physical damage

Test point: Module exterior and connectors
Expected: No cracks, breaks, dirt, loose connectors, corrosion, bent pins, leakages or stains

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

rSO2 device failure

Alarm area message indicates CARESCAPE rSO2 startup or initialization failure

Ranked causes

1. CARESCAPE rSO2 startup or initialization failure (common)

First check

Verify CARESCAPE rSO2 connection

Test point: rSO2 device connector
Expected: Device connected and powered

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

rSO2 excess light detected

Excessive ambient light detected on an rSO2 sensor channel

Ranked causes

1. High ambient light conditions (common)

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

rSO2 interference detected

rSO2 measurement is disturbed by interference on a channel

Ranked causes

1. Interference from external source (occasional)

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

rSO2 measurement removed

Alarm area message indicates device has been disconnected

Ranked causes

1. CARESCAPE rSO2 disconnected from acquisition platform (common)

First check

Check CARESCAPE rSO2 physical connection

Test point: rSO2 device connector to acquisition platform
Expected: Device physically connected

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

rSO2 poor signal patient safety

rSO2 measurement cannot be performed due to poor signal quality on a channel

Ranked causes

1. Poor sensor positioning or defective sensor (common)

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

rSO2 sensor disconnected

rSO2 sensor has been disconnected from the channel

Ranked causes

1. Sensor cable disconnected or loose (common)

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

rSO2 sensor off

Parameter alarm area message indicates sensor not connected to patient

Ranked causes

1. rSO2 sensor not connected to patient (common)

First check

Verify rSO2 sensor attachment to patient

Test point: Sensor contact points on patient skin
Expected: Sensor in full contact with patient

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

rSO2 sensor replacement required

rSO2 sensor is defective or not compatible with the system

Ranked causes

1. Defective or incompatible sensor (occasional)

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

Sample line blocked

Alarm area or parameter window message indicates gas sampling line obstruction

Ranked causes

1. Gas sampling line blocked (common)

First check

Inspect sample line patency

Test point: Entire sample line from patient connector to device inlet
Expected: Clear unobstructed passage for gas

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

Sample line disconnected

Alarm area or parameter window message indicates sample line connection lost

Ranked causes

1. Sample line is disconnected (common)

First check

Verify sample line connections

Test point: Sample line connectors at patient end and device inlet
Expected: All connectors firmly seated and connected

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

Select patient age for CO2 patient safety

Alarm area or parameter window message indicates age not selected

Ranked causes

1. Patient age not selected before CO2 measurement start (common)

First check

Verify patient age entry

Test point: Age parameter in monitor setup
Expected: Patient age selected and visible

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

Sensor overheating warning caution

Alarm area or parameter window message indicates internal temperature too high

Ranked causes

1. CARESCAPE CO2 Microstream internal temperature too high (occasional)

First check

Check device placement and ventilation

Test point: CARESCAPE CO2 device position and surrounding environment
Expected: Device in open well-ventilated location, not covered

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

Service CO2 sensor

Alarm area or parameter window message indicates problem with CARESCAPE CO2 device

Ranked causes

1. Problem with CARESCAPE CO2 Microstream device (occasional)

First check

Attempt device reset/reconnection

Test point: Device connector and interface
Expected: Device responds and error clears

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

Unsupported rSO2 sensor

Parameter alarm area message indicates sensor type not supported

Ranked causes

1. Sensor type is not supported (occasional)

First check

Verify rSO2 sensor type compatibility

Test point: Sensor model/type label
Expected: Supported sensor type for this equipment

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

Warming up

Parameter window message indicates CARESCAPE CO2 device warm-up in progress

Ranked causes

1. CARESCAPE CO2 Microstream warming up after startup (common)

First check

Monitor warm-up progress

Test point: Parameter window display
Expected: Warm-up message clears after completion

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

Waveform over scale

Waveform area message indicates gas signal exceeds maximum display range

Ranked causes

1. Incorrect waveform scale; gas concentration exceeds upper limit (common)

First check

Adjust waveform display scale

Test point: Waveform scale setting in menu
Expected: Scale appropriate for measured gas concentration

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

Zeroing in progress

Parameter or waveform area message indicates CO2 zeroing calibration underway

Ranked causes

1. Zeroing calibration process in progress (common)

First check

Monitor zeroing progress

Test point: Parameter or waveform display
Expected: Zeroing message clears when process completes

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

Error codes

Code	Meaning	Trigger	Severity
`0x108F`	Front end processor startup failure	CO2 device initialization failure on startup	error
`0x110F`	Identical CO2 device detected	Multiple CARESCAPE CO2 Microstream devices connected simultaneously	warning
`0x124F`	Incorrect initialization	CO2 device initialization error during startup	error
`0x128F`	No keep alive response	CO2 device communication loss with monitor	error
`E-musb disabled. Connect parameters to CS ONE.`	E-musb module disabled due to active CARESCAPE ONE connection	CARESCAPE Parameter connected to E-musb while CARESCAPE ONE is connected to monitor	warning
`E-musb faulty device in port X`	Overcurrent condition detected on E-musb port A or B	Hardware detects overcurrent on indicated port	error
`E-musb module error`	Hardware error detected in E-musb module	Module firmware detects internal hardware fault	error
`E-musb unknown device in port X`	Unrecognized or incompatible device connected to E-musb port A or B	Module detects incompatible parameter or USB device on port	warning

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.