Patient monitors

GE Healthcare E-NMT: troubleshooting and error codes

The ServiceForge knowledge base holds 15 documented symptoms for the GE Healthcare E-NMT, with 19 ranked causes, 13 diagnostic checks with test points and expected values, and 13 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Response too weak message displayed patient safety

Maximum gain insufficient to increase response signal amplitude to measurable level during NMT measurement

Ranked causes

1. Stimulus electrodes loose or improperly positioned (common)
2. Response electrodes attached at wrong location (common)
3. Stimulus current too weak (occasional)
4. Electrodes dry or skin not properly prepared (occasional)

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

Reference not stable message displayed patient safety

Reference setting fails because measurement responses differ more than 10% due to patient factors or measurement errors

Ranked causes

1. Patient given relaxants during measurement (occasional)
2. Movement artifacts in electrode signal (occasional)

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

Calibration: NMT module functional check patient safety

Verify NMT module operation after maintenance or repair using simulator and sensor equipment

Ranked causes

1. Module requires functional verification after service (common)

First check

Verify front cover integrity

Test point: Front cover
Expected: Intact with no damage

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

Calibration: NMT module simulator and sensor setup

Prepare and connect NMT simulator and sensor equipment for module functional verification testing

Ranked causes

1. Equipment setup required for functional verification (common)

First check

Verify NMT Simulator availability

Test point: Test equipment
Expected: NMT Simulator P/N 871251–HEL present and functional

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

Check electrodes message displayed patient safety

One of stimulating electrodes (white or brown) disconnected, broken cable, or sensor error during NMT measurement

Ranked causes

1. Stimulating electrode disconnected or cable broken (common)

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

EMG electrodes off message displayed patient safety

One of recording electrodes (red or green) in ElectroSensor disconnected or broken during NMT measurement

Ranked causes

1. Recording electrode disconnected or broken (common)

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

Identical NMT modules message displayed

System detects two or more NMT modules installed simultaneously, causing conflict

Ranked causes

1. Multiple NMT modules connected to system (occasional)

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

Measurement off message displayed

NMT measurement has been stopped, measurement not running

Ranked causes

1. Measurement manually stopped or not started (common)

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

NMT cable removed message displayed patient safety

NMT sensor cable and sensor not physically connected to the module port

Ranked causes

1. NMT sensor cable disconnected from module (common)

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

NMT measurement removed message displayed patient safety

NMT module disconnected from module slot in main monitor unit

Ranked causes

1. NMT module not inserted in slot (common)

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

Regional Block message displayed patient safety

Nerve location with regional block stimulation is currently in progress during NMT measurement

Ranked causes

1. Regional block stimulation procedure active (common)

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

Setting reference message displayed

Reference setting procedure is currently in progress during NMT measurement

Ranked causes

1. Reference calibration procedure active (common)

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

Supramax not found message displayed patient safety

Supramaximal stimulus current could not be found, system defaults to 70 mA current

Ranked causes

1. Electrode positioning or stimulus configuration incorrect (common)

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

Supramax search message displayed

Search for supramaximal stimulus pulse is currently in progress during NMT measurement

Ranked causes

1. Supramax search procedure active (common)

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

TETANIC message displayed patient safety

Tetanic stimulation is currently in progress during NMT measurement

Ranked causes

1. Tetanic stimulation procedure active (common)

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

Error codes

Code	Meaning	Trigger	Severity
`Check electrodes`	Stimulating electrode disconnected or cable broken	NMT measurement with defective electrode connection	error
`EMG electrodes off`	Recording electrode disconnected or broken	NMT measurement with defective recording electrode	error
`Identical NMT modules`	Multiple NMT modules detected in system	System startup with two or more NMT modules connected	warning
`Measurement off`	NMT measurement stopped or not running	Measurement stop command or no active measurement	info
`NMT cable removed`	NMT sensor cable and sensor disconnected from module	Cable unplugged or poor connection during operation	error
`NMT measurement removed`	NMT module disconnected from module slot	Module ejected or not fully inserted in slot	error
`Reference not stable`	Reference setting fails due to response variation >10%	Automatic reference calibration with inconsistent responses	warning
`Regional Block`	Regional block stimulation in progress	Regional block stimulation procedure active	info
`Response too weak`	Signal amplitude insufficient even at maximum gain	Weak or absent neural response during measurement	error
`Setting reference`	Reference setting calibration in progress	Reference level calibration procedure running	info
`Supramax not found`	Supramaximal stimulus current could not be located	Automatic supramax search failed to find supramaximal level	warning
`Supramax search`	Supramaximal stimulus pulse search in progress	Automatic supramax search procedure running	info
`TETANIC`	Tetanic stimulation in progress	Tetanic stimulation procedure active during NMT measurement	info

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.