Patient monitors · IntelliVue family

Philips IntelliVue MX40: troubleshooting and error codes

The ServiceForge knowledge base holds 57 documented symptoms for the Philips IntelliVue MX40, with 68 ranked causes, 7 diagnostic checks with test points and expected values, and 61 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Telemeter weak signal reception

Patient at outer range of radio coverage or receiving weak signal with high data loss from access point. May indicate AP issue.

Ranked causes

1. Patient outside optimal coverage area (common)
2. MX40 reception or RF hardware failure (occasional)
3. Access point coverage degraded in area (occasional)

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

Display does not react to touch

MX40 touchscreen unresponsive to finger input

Ranked causes

1. Screen is locked (common)
2. User not using finger to touch screen (common)

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

Display does not turn on

MX40 screen remains blank when powered on

Ranked causes

1. AA Battery Tray inserted backwards (common)
2. User not holding Main Screen button long enough (common)

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

Leadset unplugged patient safety

Patient cable unplugged from MX40 or incompatible leadset attached to patient cable

Ranked causes

1. Patient cable disconnected from monitor (common)
2. Incompatible leadset attached (occasional)

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

No central monitor connection patient safety

MX40 is out of range of network or Patient Sector at Information Center is in Standby

Ranked causes

1. MX40 out of network coverage range (common)
2. Information Center Patient Sector in Standby (common)

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

No signal at Information Center patient safety

MX40 is outside coverage area, has no batteries, or has failed; displayed as NO DATA PWM with IIC iX

Ranked causes

1. MX40 outside coverage area (common)
2. MX40 has dead batteries or failed (occasional)

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

SpO2 sensor poor signal quality patient safety

Although measurement is possible, accuracy may be reduced. Sensor receives poor signal quality during operation.

Ranked causes

1. Improper sensor application (common)
2. Sensor location suboptimal (common)

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

SpO2T sensor not properly applied patient safety

Algorithm detected sensor is connected but not properly applied to patient. Sensor application is incorrect despite connection.

Ranked causes

1. Sensor improperly applied to patient (common)
2. Sensor location inadequate (occasional)

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

WLAN connection status abnormal or offline patient safety

MX40 WLAN device fails to establish or maintain connection to Smart-hopping network or IntelliVue Information Center.

Ranked causes

1. MX40 not assigned to sector or INOP messages present (common)
2. MX40 connection status not Active (common)

First check

Verify MX40 equipment sector assignment

Test point: IntelliVue Information Center status display
Expected: MX40 listed as assigned to a specific sector with no INOP messages

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

WLAN signal strength insufficient for clinical operation patient safety

MX40 WLAN device shows poor radio signal strength (RSSI) in patient care areas, affecting wireless network performance and patient monitoring continuity.

Ranked causes

1. Access point position or insufficient coverage (common)
2. RF interference in coverage area (occasional)

First check

Verify MX40 setup for coverage test

Test point: Patient cable connection, RF auto-shutoff
Expected: Patient cable attached; RF auto-shutoff avoided by simulator, shorting ECG leads, or SpO2 measurement

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

Battery low patient safety

Less than 15 minutes of AA battery monitoring time remaining, or lithium-ion battery <10% or <30 minutes remaining

Ranked causes

1. AA or lithium-ion battery depleted (common)

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

Cableless NBP battery empty patient safety

CL NBP Pod battery completely depleted; monitoring is not possible

Ranked causes

1. CL NBP Pod battery completely discharged (common)

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

Cableless NBP battery low patient safety

CL NBP Pod has weak battery condition and cannot perform measurements

Ranked causes

1. CL NBP Pod battery depleted or low (common)

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

Cableless NBP disconnected patient safety

CL NBP Pod is not connected with the MX40; out of range or excessive radio interference

Ranked causes

1. Radio range exceeded or interference present (common)

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

Cableless SpO2 battery empty patient safety

CL SpO2 Pod battery completely depleted; monitoring is not possible

Ranked causes

1. CL SpO2 Pod battery completely discharged (common)

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

Cableless SpO2 battery low patient safety

CL SpO2 Pod has weak battery condition; charging required

Ranked causes

1. CL SpO2 Pod battery low (common)

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

Cableless SpO2 disconnected patient safety

CL SpO2 Pod is not connected with the MX40; out of range or excessive interference

Ranked causes

1. Radio range exceeded or interference present (common)

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

Cannot analyze ECG patient safety

Arrhythmia algorithm cannot reliably analyze ECG data on any monitored leads

Ranked causes

1. Lead selection error or signal quality issue (common)

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

Check pairing failed

Problem with wireless device pairing; MX40 paired with X2 monitor has lost network connection

Ranked causes

1. Pairing configuration error or network connection lost (common)

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

Cuff not deflated patient safety

Cuff pressure has exceeded the specified safety limit during NBP measurement

Ranked causes

1. Cuff did not fully deflate during measurement cycle (occasional)

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

Cuff overpressure patient safety

Cuff pressure has increased above overpressure safety limits

Ranked causes

1. Cuff pressure exceeded safety threshold (occasional)

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

Device does not recognize patient cable type patient safety

MX40 unable to identify connected IntelliVue style leadset adapter cable

Ranked causes

1. IntelliVue style leadset adapter cable in use (common)

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

ECG leads off patient safety

Multiple ECG leads are disconnected from patient or not making proper contact

Ranked causes

1. ECG leads disconnected or loose contact with patient (common)

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

ECG/ARRH alarms off patient safety

ECG arrhythmia alarm monitoring has been disabled; no alarm generation for rhythm abnormalities

Ranked causes

1. ECG monitoring disabled by user or system (common)

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

Leadset life exceeded patient safety

Single-patient use leadset has exceeded its limit of 25 cycles and must be replaced

Ranked causes

1. Leadset cycle limit reached (25 cycles) (common)

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

Local audio off

No alarm audio notification when operating in Telemetry Mode; normal operation in Telemetry Mode

Ranked causes

1. Monitor in Telemetry Mode (no audio alarms) (common)

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

MX40 WLAN IP address unavailable

MX40 is connected to access point but cannot obtain IP address. Network communication fails.

Ranked causes

1. WLAN IP address assignment failure (common)

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

MX40 WLAN out of range

MX40 wireless connection is out of range of available access points. Radio link cannot be established.

Ranked causes

1. Device outside access point coverage area (common)

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

NBP equipment malfunction caution

Tubing may be obstructed, kinked, or hardware malfunction in NBP equipment

Ranked causes

1. Tubing obstruction/kink or NBP hardware failure (occasional)

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

NBP measurement failed patient safety

Measurement values cannot be derived from NBP Pod; obstructed tubing or hardware malfunction

Ranked causes

1. Tubing obstructed or kinked; hardware malfunction (occasional)

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

NBP measurement interrupted patient safety

Preset maximum time for total NBP measurement has been exceeded due to patient movement or cuff interaction

Ranked causes

1. Patient movement or cuff/tubing interaction during measurement (common)

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

No alarm display patient safety

No local alarming at MX40 when networked with Information Center Release L or M

Ranked causes

1. Operating with older Information Center firmware (Release L or M) (occasional)

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

No host monitor connection

Paired MX40/bedside monitor is out of short-range radio range or experiencing excessive radio interference

Ranked causes

1. Radio range exceeded or radio interference present (common)

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

Replace battery required patient safety

Battery is dead and completely discharged; no monitoring occurring

Ranked causes

1. Battery completely discharged (common)

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

Respiration equipment malfunction caution

Malfunction in respiration equipment or MX40 requires calibration

Ranked causes

1. Respiration equipment hardware failure or calibration needed (occasional)

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

Respiration lead off patient safety

Respiration lead is disconnected from patient; OR leadsets cannot be used for Resp monitoring

Ranked causes

1. Respiration lead disconnected or loose (common)

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

Single ECG lead off patient safety

One ECG lead is disconnected or not making proper contact with patient

Ranked causes

1. Single lead disconnected or loose contact (common)

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

Some ECG alarms off

Some ECG alarms have been turned off at the Information Center; informational message only

Ranked causes

1. ECG alarms disabled at Information Center (unknown)

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

SpO2 equipment malfunction caution

Malfunction in SpO2 equipment; sensor or transducer failure

Ranked causes

1. SpO2 equipment hardware failure (occasional)

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

SpO2 hardware upgrade in progress patient safety

SpO2 hardware is undergoing upgrade process. Patient monitoring is not possible during this time.

Ranked causes

1. SpO2 hardware upgrade in progress (common)

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

SpO2 interference caution

Ambient light or electrical interference too high; SpO2 sensor cannot measure SpO2 and pulse rate

Ranked causes

1. Excessive ambient light or electrical noise near sensor (occasional)

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

SpO2 low perfusion patient safety

Accuracy may be reduced due to low blood perfusion at sensor site; data displayed with ?

Ranked causes

1. Low blood perfusion at sensor site (common)

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

SpO2 measurement erratic patient safety

Erratic SpO2 measurements due to faulty sensor, invalid measurements, or incorrect transducer position

Ranked causes

1. Faulty sensor or incorrect sensor position on patient (common)

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

SpO2 no pulse detected patient safety

Pulse is too weak or not detectable; sensor has fallen off at patient or poor connection

Ranked causes

1. Pulse too weak or sensor disconnected from patient (common)

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

SpO2 no sensor attached patient safety

No SpO2 sensor is attached to SpO2 device; silencing alarm turns off SpO2 measurement

Ranked causes

1. SpO2 sensor not connected or unplugged (common)

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

SpO2 noisy signal caution

Excessive patient movements or electrical interference causing irregular pulse patterns in SpO2 data

Ranked causes

1. Patient movement or electrical noise during measurement (common)

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

SpO2 unsupported sensor type

Connected SpO2 sensor and/or adapter cable is not supported by installed hardware version. Incompatible equipment detected.

Ranked causes

1. Incompatible sensor or adapter cable for hardware version (common)

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

SpO2 update period extended

Update period of SpO2 displayed values extended due to simultaneous NBP measurement or excessively noisy signal

Ranked causes

1. NBP measurement active on same limb or excessive signal noise (common)

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

SpO2T searching for measurement

Patient signal is being analyzed but valid numeric value not yet available. System is still acquiring stable measurement.

Ranked causes

1. Measurement acquisition in progress (common)

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

SpO2T sensor malfunction patient safety

Malfunction detected in SpO2 sensor or adapter cable. Hardware is defective and requires replacement.

Ranked causes

1. SpO2 sensor or adapter cable failure (common)

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

Telemeter battery charge cycle warning caution

Lithium-ion battery has less than 25 charge cycles remaining before reaching maximum limit. Battery nearing end of service life.

Ranked causes

1. Battery approaching charge cycle limit (common)

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

Telemeter battery critically low patient safety

Lithium-ion battery level is critically low with 10-minute countdown. MX40 will shut down if condition not cleared. Battery is depleted.

Ranked causes

1. Battery charge depleted below critical level (common)

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

Telemeter battery end of life reached caution

Lithium-ion battery has exceeded maximum charge cycle limit and reached end of useful life. Battery no longer functional.

Ranked causes

1. Battery maximum charge cycles exceeded (common)

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

Telemeter battery temperature critical removal required caution

Lithium-ion battery temperature exceeds 60°C. Battery must be removed immediately for safety.

Ranked causes

1. Battery temperature critically high (common)

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

Telemeter battery temperature out of range caution

Lithium-ion battery temperature is above 55°C or below -5°C. Battery thermal condition is unsafe.

Ranked causes

1. Battery temperature exceeds safe operating range (common)

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

Telemeter malfunction or self-test failure patient safety

MX40 malfunction detected or self-test failed. Device requires service replacement.

Ranked causes

1. MX40 hardware malfunction or failed self-test (common)

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

Transmitter RF auto shutoff triggered patient safety

RF transmitter automatically shut off after 10 minutes of all leads off and no SpO2 sensor connected. Transmission disabled.

Ranked causes

1. All leads detached and no SpO2 sensor for 10 minutes (common)

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

Error codes

Code	Meaning	Trigger	Severity
`BATTERY LOW T`	Low battery level on AA or lithium-ion battery	AA batteries: less than 15 minutes remaining. Lithium-ion: level < 10% or <30 minutes remaining	warning
`BATTERY LOW T`	Low battery condition with less than 15 minutes monitoring time remaining or lithium-ion <10%	Battery level drops below threshold: AA <15 min remaining or lithium-ion <10% or <30 min	warning
`CANNOT ANALYZE ECG`	Arrhythmia algorithm unable to reliably analyze ECG data on any monitored leads	Arrhythmia algorithm detects unreliable or corrupted ECG signal quality on all leads	error
`CHECK PAIRING`	Problem with wireless device pairing or network connectivity with paired monitor	Pairing configuration error or loss of network connection on wireless paired devices	warning
`cl NBP Batt Empty`	Cableless NBP Pod battery is completely empty and depleted	CL NBP Pod battery completely discharged; cannot power device	critical
`cl NBP Batt Low`	Cableless NBP Pod battery is in weak/low charge condition	CL NBP Pod battery voltage drops below operational threshold	error
`cl NBP DISCONNECT`	Cableless NBP Pod is not connected with the MX40 monitor	Wireless communication link lost between CL NBP Pod and MX40	error
`cl SpO2 Batt Empty`	Cableless SpO2 Pod battery completely empty and depleted	CL SpO2 Pod battery completely discharged; cannot power device	critical
`cl SpO2 Batt Low`	Cableless SpO2 Pod battery in weak/low charge condition	CL SpO2 Pod battery voltage drops below operational threshold	error
`cl SpO2 DISCONNECT`	Cableless SpO2 Pod is not connected with the MX40 monitor	Wireless communication link lost between CL SpO2 Pod and MX40	error
`!!!/!! CUFF NOT DEFLATED`	Cuff pressure has exceeded specified safety limit during NBP measurement	Cuff pressure remains elevated beyond safety threshold after measurement cycle	critical
`!!!/!! CUFF OVERPRESS`	Cuff pressure increased above overpressure safety limits during measurement	Cuff pressure exceeds maximum allowable overpressure threshold	critical
`ECG/ARRH ALARM OFF`	ECG monitoring turned off	ECG function disabled by user	warning
`ECG/ARRH ALARM(S) OFF`	ECG arrhythmia alarm monitoring is disabled; no alarm generation	ECG monitoring or arrhythmia alarm function disabled by user or system	warning
`ECG LEADS OFF`	Multiple ECG leads are disconnected or not making proper contact with patient	One or more ECG electrode leads detected as open or loose	error
`<electrode> LEAD OFF`	Single specified ECG lead is disconnected or not making proper contact	One ECG electrode detected as open or loose; MCL primary lead shows as V/C	error
`LEADSET LIFE`	Single-patient use leadset has exceeded its limit of 25 cycles	Leadset cycle counter reaches 25 use cycles	warning
`LEADSET UNPLUGGED`	Patient cable unplugged from MX40 or incompatible leadset attached to patient cable	Patient cable disconnected from monitor connector or wrong leadset type installed	error
`LOCAL AUDIO OFF`	No alarm audio notification when operating in Telemetry Mode (normal)	MX40 operating in Telemetry Mode; audio alarms suppressed for patient privacy	info
`NBP EQUIP MALF`	NBP equipment malfunction; tubing obstruction or hardware failure	NBP system detects tubing blockage, kink, or internal hardware malfunction	error
`NBP INTERRUPTED`	NBP measurement time exceeded maximum preset duration	Total measurement time exceeded preset maximum	error
`NBP INTERRUPTED`	NBP measurement interrupted; preset maximum measurement time exceeded	NBP measurement duration exceeds preset maximum time limit	error
`NBP MEASURE FAILED`	NBP measurement values cannot be derived; measurement unsuccessful	NBP algorithm fails to calculate systolic/diastolic/mean pressure from cuff data	error
`NO ALARM DISPLAY`	No local alarm display at MX40 when operating with Information Center Release L or M	Operating with Information Center Release L or M in networked or non-networked mode	warning
`NO CENTRAL MONITOR`	MX40 is out of range of network or Information Center Patient Sector in Standby	Wireless network connection lost or Information Center Patient Sector in Standby mode	error
`NO HOST MONITOR`	Paired MX40/bedside monitor is out of short-range radio range or experiencing interference	Wireless short-range link lost between MX40 and bedside monitor or host device	error
`NO HOST MONITORING`	MX40 out of short-range radio range or excessive radio interference	Loss of short-range wireless connectivity or high RF interference	error
`NO SIGNAL`	MX40 not detected at Information Center; displayed as NO DATA PWM with IIC iX	Information Center cannot receive signal from MX40 monitor	error
`NO SIGNAL`	MX40 outside coverage area, no batteries, or device failed	MX40 not detected by Information Center due to range loss, power loss, or failure	error
`REPLACE BATTERY T`	Dead battery with no monitoring occurring; battery must be replaced immediately	Battery completely discharged and unable to power the device	critical
`RESP EQUIP MALF`	Malfunction in respiration measurement equipment or MX40 requires calibration	Respiration sensor detects malfunction or MX40 firmware detects need for calibration	error
`RESP LEAD OFF`	Respiration lead disconnected from patient; OR leadsets cannot monitor Resp	Respiration electrode lead detected as open or loose	error
`SOME ECG ALARMS OFF`	Some ECG alarms have been disabled at Information Center level	Selected ECG alarm thresholds disabled by Information Center configuration	info
`SpO2 POOR SIGNAL`	Measurement possible but accuracy reduced due to poor signal quality	Low-amplitude or noisy SpO2 signal	warning
`SpO2T EQUIP MALF`	Malfunction in SpO2 measurement equipment or transducer	SpO2 sensor detects internal hardware malfunction or communication error	error
`SpO2T ERRATIC`	Erratic SpO2 measurements	Faulty sensor, invalid measurements, or incorrect transducer position	error
`SpO2T ERRATIC`	Erratic SpO2 measurements due to faulty sensor or incorrect transducer position	SpO2 algorithm detects invalid or unstable measurement values	error
`SpO2T EXTD UPDATE`	Update period of SpO2 displayed values extended due to NBP or signal noise	SpO2 algorithm detects high noise or simultaneous NBP measurement on same limb	warning
`SpO2T INTERFERENCE`	Ambient light or electrical interference too high; SpO2 sensor cannot measure	SpO2 sensor detects excessive optical or electrical noise in measurement signal	error
`SpO2T LOW PERF`	Accuracy reduced due to low perfusion at sensor site; data shown with ?	SpO2 algorithm detects insufficient blood flow at measurement site	warning
`%SpO2T NOISY SIGN`	Excessive patient movement or electrical interference causing irregular pulse patterns	SpO2 algorithm detects high-frequency noise in pulse waveform	error
`SpO2T NO PULSE`	Pulse is too weak or not detectable; sensor may have fallen off patient	SpO2 algorithm cannot detect pulse wave in measurement signal	error
`SpO2T NO SENSOR`	No SpO2 sensor attached to SpO2 measurement device	SpO2 system detects missing or disconnected sensor	error
`SpO2T SEARCHING`	SpO2 measurement acquisition in progress	Sensor connected and analyzing patient signal	info
`SpO2T SEARCHING`	Patient signal analyzed but valid numeric not yet available	SpO2 measurement algorithm initializing or processing signal	info
`SpO2T SENSOR MALF`	Malfunction of the SpO2 sensor or adapter cable	SpO2 sensor or adapter hardware failure	error
`SpO2T SENSOR OFF`	Sensor connected but not properly applied to patient	Sensor not making proper contact with patient skin	error
`SpO2T UPGRADE`	SpO2 hardware firmware upgrade in progress	Upgrade process initiated and running	warning
`SpO2 UNKN SENSOR`	Connected SpO2 sensor and/or adapter cable not supported by hardware version	Incompatible sensor or adapter cable attached	error
`TELE BATT EMPTY`	Lithium-ion battery critically low with 10-minute countdown to shutdown	Lithium-ion battery level critically depleted	error
`TELE BATTERY LOW`	Lithium-ion battery level critically low	Lithium-ion battery level < 20% or < 30 minutes remaining	warning
`TELE BATTERY TEMP`	Temperature of lithium-ion battery outside safe operating range	Battery temperature above 55°C or below -5°C	error
`TELE BATTERY TEMP`	Telemeter battery temperature out of safe range	Battery temperature exceeded limits (>55°C or <-5°C)	error
`TELE CHECK BATT`	Lithium-ion battery nearing maximum charge cycle limit	Battery has < 25 charge cycles remaining before reaching maximum	warning
`TELE MALFUNCTION`	MX40 malfunction or self-test failure	Internal device failure or Power On Self Test failure detected	critical
`TELE REMOVE BATT`	Battery temperature exceeds safe limit and must be removed immediately	Lithium-ion battery temperature > 60°C	critical
`TELE SERVICE BATT`	Lithium-ion battery reached end of useful life	Battery has exceeded maximum charge cycle limit	error
`TELE WEAK SIGNAL`	Weak wireless signal reception with high data loss	Patient at outer range of coverage area or MX40 receiving weak signal from AP	warning
`TRANSMITTER OFF`	RF transmitter disabled after 10 minutes with all leads off and no SpO2 sensor	All ECG leads off and no SpO2 sensor connected for 10 minutes	error
`UNSUPPORTED LAN`	MX40 cannot obtain IP address on WLAN	Device connected to AP but IP assignment failed	error
`WIFI OUT OF RANGE`	MX40 WLAN out of access point coverage range	No access points detected or signal too weak	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.