Patient monitors · Philips Vitals Signs Monitors VSx family

Philips VS4 QuickAlerts Configuration: troubleshooting and error codes

The ServiceForge knowledge base holds 65 documented symptoms for the Philips VS4 QuickAlerts Configuration, with 136 ranked causes, 123 diagnostic checks with test points and expected values, and 128 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Temperature measurements not displayed

Temperature reading does not appear on monitor screen

Ranked causes

1. Temperature probe disconnected from monitor (common)
2. Temperature probe misplaced (common)
3. Predictive temperature out of range (common)
4. Temperature probe malfunctioned (occasional)
5. Front end board malfunction (occasional)
6. Temperature module malfunction (occasional)
7. Main board malfunction (occasional)

First check

Verify temperature probe connection and seating

Test point: Temperature probe connector and probe well
Expected: Probe firmly seated in probe well

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

NBP measurements not displayed patient safety

NBP readings are not shown on monitor screen even after measurement attempt

Ranked causes

1. Wrong cuff size or incorrect cuff placement (common)
2. Initial pressure setting incorrect (common)
3. Air tube bent, twisted, or cuff has air leakage (common)
4. External problem with measurement conditions (common)
5. NBP pump filter is blocked (occasional)
6. NBP module error (occasional)

First check

Verify cuff size and placement

Test point: Patient arm and cuff fit
Expected: Correct size cuff applied at correct location

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

Unit does not turn on with AC power high voltage

Monitor powers on with battery but not when connected to AC outlet

Ranked causes

1. AC power cord unplugged or broken (common)
2. Fuse is blown (common)
3. Power supply cable malfunction (occasional)
4. Power supply output voltage incorrect (occasional)
5. AC power connector malfunction (occasional)
6. Main board malfunction (occasional)

First check

Verify AC power cord connection

Test point: AC outlet and monitor connector
Expected: Power cord plugged in securely

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

Monitor power and basic operation troubleshooting

Initial diagnostic checks before detailed troubleshooting: power switch status, battery charge, AC connection, display function, and LED indicators

Ranked causes

1. Power switch not enabled (common)
2. Battery not adequately charged (common)
3. AC power not connected or outlet non-functional (common)
4. Display malfunction (occasional)
5. LED indicators not illuminated as expected (occasional)

First check

Verify power switch is turned on

Test point: Power switch on front panel
Expected: Power switch in ON position

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

NBP cuff does not inflate patient safety

Blood pressure cuff fails to inflate when NBP measurement is initiated

Ranked causes

1. Air tube or cuff bent or twisted (common)
2. Air leak in air tube or cuff (common)
3. NBP module malfunctioned (occasional)
4. NBP pump filter is blocked (occasional)
5. Main board malfunctioned (occasional)

First check

Inspect air tube and cuff for kinks

Test point: Air tube and cuff pathway
Expected: Tube and cuff straight and unkindled

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

Nurse call function does not signal alarm conditions patient safety

Nurse call system fails to alert when monitor alarms are triggered

Ranked causes

1. Minimum Nurse Call Alarm Priority set too high (common)
2. Alarms have been silenced (common)
3. Phono connector is loose or broken (occasional)
4. Communications board malfunctioned (occasional)
5. Main board malfunctioned (occasional)

First check

Verify nurse call alarm priority threshold

Test point: Configuration menu alarm priority settings
Expected: Priority threshold set appropriately low

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

Recorder does not print

Recorder module fails to produce printed output

Ranked causes

1. Recorder is out of paper (common)
2. Recorder door is open (common)
3. System does not recognize recorder (occasional)
4. Recorder module malfunctioned (occasional)
5. Main board malfunctioned (occasional)

First check

Verify paper supply

Test point: Recorder paper roll
Expected: Paper loaded in recorder

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

SpO2 measurements not displayed

Oxygen saturation readings do not appear on monitor screen

Ranked causes

1. SpO2 module in learning phase (common)
2. SpO2 sensor malfunctioned (occasional)
3. SpO2 board has faulty connection to front end board (occasional)
4. SpO2 board malfunctioned (occasional)
5. Main board malfunctioned (occasional)

First check

Wait for SpO2 module learning phase to complete

Test point: SpO2 module status indicator
Expected: Learning phase completed

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

Audible alarms do not sound patient safety

Audio alarm functionality is silent; monitor does not produce alarm tones

Ranked causes

1. Monitor in Audio Pause or Audio Off mode (common)
2. Speaker connection faulty (occasional)
3. Speaker malfunctioned (occasional)
4. Main board malfunction (occasional)

First check

Verify audio alarm mode setting

Test point: System Menu audio settings
Expected: Audio mode set to normal (not Audio Off or Audio Pause)

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

Monitor does not respond to navigation wheel or keys

Front panel keys and navigation wheel do not produce any function

Ranked causes

1. Main board has faulty connection (occasional)
2. Front panel keypad or navigation wheel broken (occasional)
3. Main board malfunctioned (occasional)
4. Membrane switch assembly malfunction (occasional)

First check

Inspect main board connector seating

Test point: Main board connectors
Expected: All connectors firmly seated

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

Monitor does not respond to touch screen

Touch screen input is not recognized or does not function

Ranked causes

1. Touch screen is locked (common)
2. Touch screen is not configured (occasional)
3. Touch screen is not calibrated (occasional)
4. Touch screen malfunctioned (occasional)

First check

Verify touch screen is not locked

Test point: System Menu or lock status display
Expected: Touch screen unlocked status shown

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

NBP measurements unreliable patient safety

Blood pressure readings are inconsistent, inaccurate, or vary widely between measurements

Ranked causes

1. Wrong cuff size or incorrect cuff placement (common)
2. Initial pressure setting incorrect (common)
3. External problem with measurement conditions (common)
4. NBP module needs calibration (occasional)

First check

Verify cuff size and placement

Test point: Patient arm and cuff fit
Expected: Correct size cuff applied at correct location

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

Temperature measurements unreliable

Temperature readings are inconsistent, inaccurate, or vary between measurements

Ranked causes

1. Temperature probe malfunctioned (common)
2. Temperature module not calibrated (common)
3. Front end board malfunction (occasional)
4. Temperature module malfunctioned (occasional)

First check

Verify temperature module calibration

Test point: Calibration status in diagnostics
Expected: Module calibrated and within tolerance

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

Unit does not turn on with battery power

Monitor powers on with AC but not when using battery

Ranked causes

1. Battery not charged (common)
2. Battery or battery connector loose (common)
3. Battery board not connected to main board (occasional)
4. Main board malfunction (occasional)

First check

Verify battery charge status

Test point: Battery charging indicator or battery gauge
Expected: Battery charged or charging LED lit

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

USB hub does not work

USB hub ports are non-functional or not recognized

Ranked causes

1. USB hub is disconnected from monitor (common)
2. Hub USB ports are blocked by dust or dirt (common)
3. USB hub is broken (occasional)
4. LAN board is broken or not properly connected (occasional)

First check

Verify USB hub cable connection to monitor

Test point: USB hub power and data connectors
Expected: All USB plugs firmly connected to ports

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

Monitor screen is blank

Power is on but display shows no image or content

Ranked causes

1. Monitor in Standby mode (common)
2. LCD backlight connection faulty (occasional)
3. Main board malfunction (occasional)

First check

Verify monitor is not in Standby mode

Test point: Monitor status indicator and display
Expected: Monitor active, display lit

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

Random or distorted graphics with white background

Display shows garbled text and images with white background

Ranked causes

1. LCD signal cable not attached correctly (common)
2. LCD malfunctioned (occasional)
3. Main board malfunction (occasional)

First check

Inspect and reseat LCD signal cable

Test point: LCD signal cable connectors
Expected: Cable seated fully on both connectors

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

Recorder paper is jamming

Recorder paper does not feed properly or becomes stuck

Ranked causes

1. Paper not installed correctly (common)
2. Wrong type of paper installed (common)
3. Recorder has mechanical problem (occasional)

First check

Remove and inspect recorder paper installation

Test point: Recorder paper path and rollers
Expected: Paper properly threaded and fed straight

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

Software upgrade failure or interruption patient safety

Monitor enters failed state if software upgrade is interrupted or USB drive is removed during process

Ranked causes

1. Upgrade interrupted by unplugging monitor during process (rare)
2. Upgrade interrupted by removing USB flash drive during process (rare)
3. Upgrade interrupted by pressing keys during process (rare)

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

Monitor does not power on

No power to monitor; verify AC power cord and battery connected, check LED indicators

Ranked causes

1. No AC power or battery installed (common)
2. Power supply or charging issue (common)

First check

Verify AC power cord or battery inserted

Test point: Power connector and battery slot
Expected: Power source connected to monitor

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

NBP initial pressure too high patient safety

Blood pressure cuff inflates to excessively high pressure on initial measurement

Ranked causes

1. Cuff is too tight (common)
2. Initial inflation pressure setting incorrect (common)

First check

Inspect cuff fit on patient

Test point: Cuff tightness around arm
Expected: Cuff snug but not constricting circulation

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

Recorder test pattern abnormal

Optional recorder prints incorrect or defective test pattern during diagnostics

Ranked causes

1. Faulty print head (unknown)
2. Motor malfunction (unknown)

First check

Run recorder test from System Diagnostics menu

Test point: Recorder Test button
Expected: Test pattern prints

Self test fails on NBP module

Self test displays Failed (red text) for NBP test during diagnostic run

Ranked causes

1. NBP module not detected or NBP initialization failure (common)
2. Main board failure (occasional)

First check

Run self test

Test point: System Diagnostics menu, Self Test button
Expected: All test results display Passed or Not Supported

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

SpO2 measurements unreliable

Oxygen saturation readings are inconsistent, inaccurate, or unstable

Ranked causes

1. External problem such as excessive patient movement (common)
2. Perfusion is low (occasional)

First check

Verify patient positioning and movement

Test point: Patient arm position and body movement
Expected: Patient calm and arm stable

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

System error code 1051: Cannot initialize NBP

Self test reports system error code 1051 during startup or diagnostic run

Ranked causes

1. NBP module communication failure (common)
2. Main board fault (occasional)

First check

Shutdown and restart

Test point: Power supply
Expected: Monitor boots without 1051 error

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

Access System Admin Menu with password

Procedure to unlock System Admin Menu for configuring password-protected functions including Demo Mode, system diagnostics, and software upgrade

Ranked causes

1. Need to access System Admin functions (common)

First check

Access System Menu and select System Admin

Test point: System Menu interface
Expected: System Admin button visible and selectable in System Menu

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

Access System Diagnostics for verification testing

Open System Diagnostics menu from System Admin to perform verification tests; monitoring is suspended while menu is open

Ranked causes

1. Need to perform verification testing on monitor (common)

First check

Navigate to Diagnostics in System Admin Menu

Test point: System Admin Menu display
Expected: Diagnostics button visible and available (not grayed out)

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

AUDIO FAILED error appears

Flashing red and white box with AUDIO FAILED message displayed on screen

Ranked causes

1. Speaker malfunctioned or connection faulty (common)

First check

Verify speaker connection

Test point: Speaker connector at main board
Expected: Speaker cable firmly seated

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

Auto Set Alarm Limits button unavailable

Auto Set Alarm Limits function cannot be accessed or is greyed out

Ranked causes

1. Monitor not in NBP Interval or Continuous SpO2 mode (common)

First check

Verify monitor measurement mode

Test point: Monitor operating mode display
Expected: Monitor in NBP Interval mode or Continuous SpO2 mode

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

Battery LED test failure

Charging LED does not display expected yellow-green-yellow-green sequence during System Diagnostics LED test

Ranked causes

1. Battery charging circuit malfunction (common)

First check

Battery LED test sequence

Test point: Charging LED indicator
Expected: Lights yellow 5s, lights green 5s, flashes yellow 5s, flashes green 5s

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

Battery reconditioning required

Battery Max Error is 10% or greater, indicating degraded capacity

Ranked causes

1. Battery Max Error 10% or greater (occasional)

First check

Measure battery Max Error

Test point: Battery system
Expected: Less than 10%

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

Battery service required message displayed

Monitor displays Battery service required alert on screen

Ranked causes

1. Max Error value exceeds 8% or Full Capacity half of Design Capacity (common)

First check

Check battery error and capacity values

Test point: Battery diagnostics in System Menu
Expected: Max Error < 8%, Full Capacity >= 50% of Design Capacity

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

Calibration: Monitor internal repair verification patient safety

Performance verification testing after opening monitor or replacing internal parts

Ranked causes

1. Monitor opened or internal parts replaced (non-NBP) (common)

First check

Power-on self test

Test point: monitor startup
Expected: Self test completes without errors

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

Calibration: NBP accuracy

Non-invasive blood pressure measurement accuracy verification using reference manometer and expansion chamber connected to NBP connector.

Ranked causes

1. NBP sensor drift or offset error requiring calibration (common)

First check

Connect manometer pump and tubing to NBP connector

Test point: NBP connector
Expected: Connection established

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

Calibration: NBP module patient safety

Verify NBP (Non-invasive Blood Pressure) module calibration after replacement or maintenance

Ranked causes

1. NBP module or parts replaced (common)

First check

Power-on self test

Test point: Monitor startup
Expected: Self test completes successfully

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

Calibration: NBP module verification patient safety

Performance verification and testing of NBP (non-invasive blood pressure) system after replacement or maintenance

Ranked causes

1. NBP module or parts replaced (common)

First check

Power-on self test

Test point: monitor startup
Expected: Self test completes without errors

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

Calibration: NBP pneumatic leakage

Pneumatic system and valve leakage test to verify pressure retention over time in the NBP module.

Ranked causes

1. Pneumatic tubing leak or valve malfunction (occasional)

First check

Apply 280 mmHg pressure and record initial value (P1)

Test point: NBP Test window pressure display
Expected: 280 mmHg applied and stabilized

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

Calibration: Software upgrade verification patient safety

Verification testing after software upgrade to ensure system settings and functionality

Ranked causes

1. Software upgraded (occasional)

First check

Power-on self test

Test point: monitor startup
Expected: Self test completes without errors

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

Calibration: SpO2 performance verification patient safety

Oxygen saturation measurement accuracy requires periodic verification

Ranked causes

1. SpO2 measurement accuracy drift (occasional)

First check

Perform SpO2 accuracy test

Test point: SpO2 measurement system
Expected: Within device specification

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

Calibration: Tympanic temperature accuracy patient safety

Temperature measurement may drift out of specification

Ranked causes

1. Temperature measurement drift over time (common)

First check

Verify predictive temperature accuracy is within specification

Test point: Temperature measurement system
Expected: Within device specification

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

Cannot initialize NBP patient safety

System cannot initialize non-invasive blood pressure module

Ranked causes

1. NBP module hardware fault or disconnection (unknown)

First check

Verify NBP module connection

Test point: NBP module connector at main board
Expected: Connector fully seated, no visible damage

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

Charging LED test failure

Battery LED does not exhibit expected light sequence during LED test

Ranked causes

1. LED or battery charging circuit malfunction (unknown)

First check

Run LED test from System Diagnostics menu

Test point: Charging LED indicator
Expected: Lights yellow 5 sec, green 5 sec, flashes yellow 5 sec, flashes green 5 sec; AC Power LED stays green

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

Clear patient data from monitor memory

Remove all stored patient information before returning monitor for service or maintenance; does not affect calibration or hardware configuration data

Ranked causes

1. Patient data retention in memory (common)

First check

Open Maintenance options

Test point: System Diagnostics menu
Expected: Maintenance options accessible

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

Enable Demo Mode on vital signs monitor patient safety

Activate Demo Mode to demonstrate monitor without actual patient connection; demo simulates all patient parameters and generates alarms when thresholds exceeded

Ranked causes

1. Need to demonstrate monitor functionality without patient (common)

First check

Open System Admin Menu

Test point: System Admin Menu access
Expected: System Admin Menu displays all configuration options

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

Fuse replacement required high voltage

AC power fuse in connector needs replacement due to blown or failed fuse

Ranked causes

1. Blown or failed AC power fuse (unknown)

First check

Disconnect AC power cord

Test point: Rear of monitor
Expected: Power cord removed

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

Internal parts replaced (non-NBP, non-SpO2) caution

Verify monitor function after replacement of internal components other than NBP or SpO2 modules

Ranked causes

1. Internal component replaced (occasional)

First check

Power-on self test

Test point: Monitor startup and diagnostics
Expected: Self test completes successfully

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

Key is collapsed or does not click when pressed

Front panel key is unresponsive or lacks tactile feedback

Ranked causes

1. Membrane switch assembly malfunctioned (occasional)

First check

Inspect affected key physical condition

Test point: Key button surface and mechanical travel
Expected: Key has normal tactile feedback and click

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

Loss of monitoring patient safety

Monitoring capability temporarily lost or not available

Ranked causes

1. Temporary system state or informational condition (unknown)

Memory error detected patient safety

System memory test failed during self-test or startup

Ranked causes

1. Memory module fault or unseated connection (unknown)

First check

Note error code during startup

Test point: System startup display
Expected: No error code 1052 displayed

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

Monitor display incorrect or absent

LCD not displaying correctly or shows no image after power-up

Ranked causes

1. Display initialization failure (unknown)

First check

Verify color bar appears on startup

Test point: LCD display
Expected: Color bar visible for ~5 seconds

Monitor does not power up after power supply reconnection high voltage

Monitor fails to power on after reconnecting power supply connectors to main board

Ranked causes

1. Power supply connectors reversed during reconnection (occasional)

First check

Verify power supply connector polarity

Test point: 6-pin and 2-pin connectors at main board
Expected: White 6-pin connector connected to power supply; black connector connected to main board

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

Monitor freezes on opening screen or color bar

Monitor starts bootup but freezes on splash screen or test pattern

Ranked causes

1. Main board malfunction (occasional)

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

Monitor opened for any reason patient safety

Perform required tests after opening monitor enclosure for repairs or maintenance

Ranked causes

1. Monitor enclosure opened for service (common)

First check

Power-on self test

Test point: Monitor startup
Expected: Self test completes successfully

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

Nurse call relay function not operating

Nurse call alarm output relay (phone jack connector) does not engage or release contacts (tip/ring/sleeve) during alarm condition or normal operation.

Ranked causes

1. Nurse call relay contacts not functioning (tip normally open, ring normally closed, or common not connected) (unknown)

First check

Verify tip contact (normally open relay)

Test point: Nurse call connector tip
Expected: Open at rest, closed when alarm active

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

Only one charging LED color displayed

Charging LED shows only one color instead of expected indication

Ranked causes

1. Membrane switch assembly malfunction (occasional)

First check

Inspect charging LED display

Test point: Charging indicator LED
Expected: Both LED colors visible during charge cycle

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

Patient leakage current excessive with mains voltage applied high voltage

Single fault condition test with mains voltage on applied part; leakage current from applied part to earth measured at S5 open and closed, all polarity combinations tested via S2 and S6 for each measurement input.

Ranked causes

1. Leakage current exceeds 50 µA at 250 V under single fault condition (unknown)

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

Pressing a key does not access expected function

Front panel key performs incorrect action (e.g., pressing Print initiates NBP)

Ranked causes

1. Membrane switch assembly malfunctioned (occasional)

First check

Test all front panel keys for correct function

Test point: Each key and expected function
Expected: Each key triggers correct action

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

System error code 1052: Memory error

Self test reports system error code 1052 indicating internal memory failure

Ranked causes

1. Main board memory failure (common)

First check

Shutdown and restart

Test point: Power supply and system memory
Expected: Monitor boots without 1052 error

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

System error code 1053: Loss of monitoring patient safety

System reports error code 1053 indicating loss of monitoring capability

Ranked causes

1. Informational message; normal operation mode change (unknown)

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

Test: Nurse call relay verification patient safety

Nurse call relay function requires periodic verification to ensure alarm notification

Ranked causes

1. Nurse call relay degradation over time (rare)

First check

Verify nurse call relay operates correctly

Test point: Nurse call relay output
Expected: Relay activates and deactivates as commanded

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

More symptoms

Tympanic temperature reading unusually high
Tympanic temperature reading unusually low
Unit does not turn on with either AC or battery power
Upgrade monitor software
Verify system after software upgrade

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

Error codes

Code	Meaning	Trigger	Severity
`1025`	System Error (1025)	Could not load ResourceDLL.dll	error
`1026`	System Error (1026)	Could not load data from flash	error
`1027`	System Error (1027)	Could not start the front end	error
`1028`	System Error (1028)	Could not stop the front end	error
`1029`	System Error (1029)	Could not allocate enough memory	error
`1030`	System Error (1030)	Error when system shut down front end	error
`1031`	System Error (1031)	Monitoring and watchdog thread could not initialize	error
`1032`	System Error	Could not open audio files	error
`1033`	System Error	Unspecified error	error
`1034`	System Error	Failed to load product info	error
`1035`	System Error	Cannot initialize the front-end manager	error
`1036`	System Error	Failed to start work thread	error
`1037`	System Error	Cannot start polling thread	error
`1039`	System Error	Cannot get front-end version	error
`1042`	System Error	Failed to start up network driver	error
`1043`	System Error	Work thread timed out	error
`1044`	System Error	Front end software error	error
`1045`	System Error	Printing software error	error
`1047`	System Error	Monitoring software error	error
`1048`	System Error	Exception detected in alarming software	error
`1050`	System Error	Failed to stop work thread	error
`1051`	Cannot initialize NBP module	NBP module initialization fails during startup or self test	error
`1052`	Memory error	Memory test fails during startup or self test execution	error
`1053`	Loss of monitoring	Monitoring capability temporarily lost	info
`257`	System Error - battery charger power failure	Battery charger unable to deliver power	error
`261`	System Error - battery overcharged	Battery charging circuit detects overcharge condition	error
`264`	System Error - battery over temperature	Battery temperature sensor detects excessive temperature	warning
`817`	FPGA FIFO Overrun	FPGA first-in-first-out buffer overflow during NBP operation	info
`818 (101)`	NBP Equipment Malfunction - task overrun	NBP task scheduler unable to complete tasks in time	warning
`818 (102)`	NBP Equipment Malfunction - interrupt stack overwritten	Interrupt handler stack buffer overflow	error
`818 (103)`	NBP Equipment Malfunction - user stack overwritten	User program stack buffer overflow	error
`818 (104)`	NBP Equipment Malfunction - data validity check failed	Data integrity verification fails during operation	error
`818 (106)`	NBP Equipment Malfunction - unable to write init flag to non-volatile memory	Non-volatile memory write failure during initialization	error
`818 (107)`	NBP Equipment Malfunction - unable to verify init flag data	Non-volatile memory verification fails after write	error
`818 (109)`	NBP Equipment Malfunction - unable to write NBP configuration to non-volatile memory	Configuration data write failure	error
`818 (110)`	NBP Equipment Malfunction - unable to write NBP configuration to non-volatile memory	Configuration data write failure	error
`818 (111)`	NBP Equipment Malfunction - calibration data checksum error	Calibration data checksum verification fails	error
`818 (112)`	NBP Equipment Malfunction - unable to write calibration data to non-volatile memory	Calibration data write failure	error
`818 (113)`	NBP Equipment Malfunction - unable to verify calibration data	Calibration data verification fails after write	error
`818 (114)`	NBP Equipment Malfunction - error log checksum error	Error log data checksum verification fails	error
`818 (115)`	NBP Equipment Malfunction - unable to write error log to non-volatile memory	Error log data write failure	error
`818 (116)`	NBP Equipment Malfunction - unable to verify error log data	Error log verification fails after write	error
`818 (117)`	NBP Equipment Malfunction - inflation cycle count and runtime data checksum error	Cycle count data checksum verification fails	error
`818 (118)`	NBP Equipment Malfunction - unable to write inflation cycle count and runtime data	Cycle count data write failure	error
`818 (119)`	NBP Equipment Malfunction - unable to verify inflation cycle count and runtime data	Cycle count data verification fails after write	error
`818 (120)`	NBP Equipment Malfunction - message sending conflict	New message queued before previous message completes transmission	warning
`818 (121)`	NBP Equipment Malfunction - pressure sensor 2 data unavailable	Second pressure sensor fails to return data	error
`818 (122)`	NBP Equipment Malfunction - 5-volt supply voltage out of range	Voltage regulation circuit detects improper 5V supply	error
`818 (123)`	NBP Equipment Malfunction - 5-volt regulator error	5-volt voltage regulator detects internal failure	error
`818 (124)`	NBP Equipment Malfunction - 12-volt supply voltage out of range	Voltage regulation circuit detects improper 12V supply	error
`818 (128)`	NBP Equipment Malfunction - pressure sensor 1 offset out of range	Pressure sensor 1 offset calibration fails validation	error
`818 (129)`	NBP Equipment Malfunction - pressure sensor 2 offset out of range	Pressure sensor 2 offset calibration fails validation	error
`818 (130)`	NBP Equipment Malfunction - pressure sensor 2 test signal response out of range	Pressure sensor 2 self-test fails validation	error
`818 (131)`	NBP Equipment Malfunction - pressure channel difference too large	Difference between two pressure channels exceeds threshold	error
`818 (132)`	NBP Equipment Malfunction - valve activated too long	Valve activation timer exceeds maximum allowed duration	error
`818 (133)`	NBP Equipment Malfunction - calibration data CRC mismatch	Calibration data CRC verification fails	error
`818 (134)`	NBP Equipment Malfunction - error log data CRC mismatch	Error log data CRC verification fails	error
`818 (135)`	NBP Equipment Malfunction - inflation cycle count data CRC mismatch	Cycle count data CRC verification fails	error
`818 (136)`	NBP Equipment Malfunction - pneumatic safety switch failure	Pneumatic safety switch detects malfunction	error
`818 (137)`	NBP Equipment Malfunction - valve 2 defective or blocked	Valve 2 unable to operate or blocked	error
`818 (141)`	NBP Equipment Malfunction - inflation time exceeded for selected patient type	NBP inflation cycle duration exceeds maximum for patient type	warning
`818 (15)`	NBP Equipment Malfunction - internal firmware error	NBP detects unrecoverable system errors in firmware	critical
`818 (199)`	NBP equipment malfunction	No data from NBP block	error
`818 (2)`	NBP Equipment Malfunction - A/D converter or pressure offset failure	NBP power-on self-test fails	error
`818 (25)`	NBP Equipment Malfunction - no data received	NBP hardware unable to receive data from pressure sensors	error
`819`	NBP equipment malfunction - not calibrated	NBP module not calibrated	warning
`819 (127)`	NBP equipment malfunction	NBP module not calibrated	error
`820 (138)`	NBP hose blocked	Problem in pneumatic system	warning
`821 (139)`	NBP air leak	Air leak or valve defect in NBP system	warning
`833 (1)`	SpO2 equipment malfunction	SpO2 ROM checksum error	error
`833 (10)`	SpO2 equipment malfunction	SpO2 host communication error	error
`833 (2)`	SpO2 equipment malfunction	SpO2 RAM test error	error
`833 (20)`	SpO2 equipment malfunction	SpO2 hardware defect	error
`833 (4)`	SpO2 equipment malfunction	SpO2 analog signal path self test failed	error
`833 (40)`	SpO2 equipment malfunction	SpO2 non-volatile memory corrupted	error
`833 (6)`	SpO2 equipment malfunction	SpO2 self test timeout	warning
`833 (8)`	SpO2 equipment malfunction	SpO2 internal DSP communication error	error
`834`	SpO2 sensor malfunction	Malfunction of SpO2 sensor or sensor cable	warning
`835`	FPGA FIFO overrun	SpO2 software error	info
`836`	SpO2 communication error	SpO2 communication error	info
`837`	SpO2 error, front end reset	No data from SpO2	error
`865`	FPGA FIFO overrun	Temperature software error	info
`866 (21)`	Temperature probe error	Probe operating above 43.3°C (112°F)	warning
`866 (22)`	Temperature probe error	Excessive heater energy	warning
`866 (32)`	Temperature probe error	Thermistor pulled away or heater broken	warning
`866 (33)`	Temperature probe error	Probe not responsive	warning
`866 (34)`	Temperature probe error	Probe not characterized or calibrated	warning
`866 (45)`	Temperature probe error	Measurement below allowable temperature values	warning
`866 (46)`	Temperature probe error	Measurement above allowable temperature values	warning
`866 (52)`	Temperature probe error	Probe not characterized or calibrated	warning
`866 (63)`	Temperature probe error	Probe well missing or not installed properly	warning
`866 (70)`	Temperature probe error	Error reading probe EEPROM	warning
`866 (75)`	Temperature probe error	Error reading probe EEPROM or not factory tested	warning
`866 (78)`	Temperature module malfunction	Probe non-volatile error detection mechanism triggered	error
`866 (79)`	Temperature module malfunction	Module non-volatile error log memory error detected	error
`866 (80)`	Temperature probe error	Software turning off heater but heater feedback still on	error
`866 (81)`	Temperature probe error	Software turning on heater but heater feedback still off	error
`867 (101)`	Temp Module Malfunc (101)	Tympanic temperature module checksum error	error
`867 (102)`	Temp Module Malfunc (102)	Tympanic temperature module calibration error	error
`867 (103)`	Temp Module Malfunc (103)	Ambient temperature below minimum operating limit	warning
`867 (104)`	Temp Module Malfunc (104)	Ambient temperature above maximum operating limit	warning
`867 (24)`	Temperature module malfunction	Ambient temperature too high	warning
`867 (25)`	Temperature module malfunction	Ambient temperature too low	warning
`867 (27)`	Temperature module malfunction	Battery or power supply voltage exceeds maximum	error
`867 (28)`	Temperature module malfunction	Battery or power supply voltage below minimum	error
`867 (47)`	Temperature module malfunction	Internal calibration resistor RCAL damaged	error
`867 (48)`	Temperature module malfunction	Internal calibration resistor RCAL damaged	error
`867 (49)`	Temperature module malfunction	Internal circuit validation resistor PTB damaged	error
`867 (50)`	Temperature module malfunction	Internal circuit validation resistor PTB damaged	error
`867 (51)`	Temperature module malfunction	A/D measurement timed out	error
`867 (59)`	Temperature module malfunction	Battery or power supply voltage below maximum	error
`867 (60)`	Temperature module malfunction	Battery or power supply voltage exceeds minimum	error
`867 (61)`	Temperature module malfunction	Reference voltage circuit under voltage or unstable	error
`867 (62)`	Temperature module malfunction	Module not calibrated	error
`867 (65)`	Temp Module Malfunc (65)	Error saving to module EEPROM	warning
`867 (66)`	Temp Module Malfunc (66)	Non-volatile calibration memory error detected	warning
`867 (67)`	Temp Module Malfunc (67)	Error reading/writing EEPROM	warning
`867 (68)`	Temp Module Malfunc (68)	Error reading/writing EEPROM	warning
`867 (69)`	Temp Module Malfunc (69)	Error reading/writing EEPROM	warning
`867 (74)`	Temp Module Malfunc (74)	Internal error during EEPROM initialization	warning
`867 (82)`	Temp Module Malfunc (82)	HTR_Q on, HTRC off, but voltage present	warning
`867 (83)`	Temp Module Malfunc (83)	HTR_Q tri-stated with HTRC enabled and heater power	warning
`867 (84)`	Temp Module Malfunc (84)	Q&C on but heater voltage insufficient	warning
`867 (85)`	Temp Module Malfunc (85)	Heater fail-safe did not turn off when expected	error
`868`	Temp Error. Front end will reset.	No data from temperature sensor	error
`881`	Speaker Malfunc (881)	Speaker failed	warning
`882`	Wireless Malfunc	Wireless module malfunction	error
`883`	Touch Screen Malfunc	Touch screen malfunction	error

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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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.