Patient monitors · Dinamap family

Critikon PRO 1000V3: troubleshooting and error codes

The ServiceForge knowledge base holds 33 documented symptoms for the Critikon PRO 1000V3, with 87 ranked causes, 34 diagnostic checks with test points and expected values, and 158 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit will not power on caution

Equipment fails to power on when AC power applied and power switch pressed

Ranked causes

1. No AC power available (common)
2. Faulty power supply (common)
3. Faulty PSU power board (occasional)
4. Faulty main board (occasional)
5. Faulty power cable (occasional)
6. Faulty power switch (occasional)

First check

Verify AC power availability at outlet

Expected: AC voltage present

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

Unit will not power on

Device fails to turn on or power up

Ranked causes

1. No AC power to unit (common)
2. Faulty power supply (occasional)
3. Faulty PSU PWA (occasional)
4. Faulty main board (occasional)
5. Faulty power cables (occasional)
6. Faulty power On/Off front panel switch (occasional)

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

Unit powers on but no display caution

Equipment powers up with signs of operation but display screen blank or dark

Ranked causes

1. Faulty display (common)
2. Faulty backlight driver (occasional)
3. Faulty main board (occasional)
4. Faulty PSU power board (occasional)

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

Unit powers on but no display

Device powers up but display shows nothing

Ranked causes

1. Faulty display (occasional)
2. Faulty backlight driver (occasional)
3. Faulty main board (occasional)
4. Faulty PSU PWA (occasional)

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

Unit will not perform NIBP function patient safety

Non-invasive blood pressure measurement not working

Ranked causes

1. Faulty main board (occasional)
2. Faulty pneumatics assembly (occasional)
3. Faulty pneumatics cable (occasional)
4. Faulty front panel switch (occasional)

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

Unit will not perform NIBP function patient safety

Non-invasive blood pressure monitoring function fails to operate

Ranked causes

1. Faulty main board (common)
2. Faulty pneumatics assembly (common)
3. Faulty pneumatics cable (occasional)
4. Faulty front panel switch (occasional)

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

Unit will not print

Printer function fails to produce output or paper issues present

Ranked causes

1. No paper or incorrect paper loading (common)
2. Faulty printer (common)
3. Faulty main board (occasional)
4. Faulty PSU power board (occasional)

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

Unit will not print

Printer module not printing documents

Ranked causes

1. Unit out of paper or paper incorrectly installed (common)
2. Faulty printer (occasional)
3. Faulty main board (occasional)
4. Faulty PSU PWA (occasional)

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

Unit will not operate on battery caution

Equipment powered by battery backup fails to operate or battery does not charge

Ranked causes

1. Battery disconnect fuse open or unplugged (common)
2. Faulty battery pack (common)
3. Faulty PSU power board (occasional)

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

Unit will not operate on battery

Device cannot run on battery power

Ranked causes

1. Battery disconnect fuse open or not plugged in (common)
2. Faulty battery pack (occasional)
3. Faulty PSU PWA (occasional)

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

Unit will not perform ECG function patient safety

Electrocardiogram monitoring function fails to operate

Ranked causes

1. Faulty ECG PWA assembly (common)
2. Faulty ECG cable assembly (common)
3. Faulty main board (occasional)

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

Unit will not perform ECG function patient safety

Electrocardiogram measurement not working

Ranked causes

1. Faulty ECG PWA assembly (occasional)
2. Faulty ECG cable assembly (occasional)
3. Faulty main board (occasional)

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

Unit will not perform SPO2 function patient safety

Pulse oximetry (SpO2) monitoring function fails to operate

Ranked causes

1. Faulty SPO2 PWA (Nellcor) (common)
2. Faulty SPO2 PWA (Masimo) (common)
3. Faulty main board (occasional)

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

Unit will not perform Temperature function patient safety

Temperature monitoring via probe fails to operate

Ranked causes

1. Faulty temperature probe (common)
2. Faulty temperature probe sensor (common)
3. Faulty main board (occasional)

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

Unit will not perform Temperature function patient safety

Temperature measurement not working

Ranked causes

1. Faulty temperature probe (occasional)
2. Faulty temperature probe sensor (occasional)
3. Faulty main board (occasional)

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

Calibration: Recorder print quality and speed

Verification that recorder prints waveforms and text at correct speed with even tone, proper pixel density, and legible spacing.

Ranked causes

1. Recorder paper misalignment or print head contamination (occasional)
2. Worn or defective recorder mechanism (rare)

First check

Verify paper is loaded in recorder

Test point: Recorder Parameter paper compartment
Expected: Paper properly loaded and ready for printing
Tools: Recorder paper

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

Unit Host Comms not functional

Host communications interface fails to operate

Ranked causes

1. Faulty main board (common)
2. Faulty PSU power board (occasional)

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

Unit host communications not functional

External device communication or networking not working

Ranked causes

1. Faulty main board (occasional)
2. Faulty PSU PWA (occasional)

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

Unit will not generate sound

Speaker or audio output not functioning

Ranked causes

1. Faulty speaker assembly (occasional)
2. Faulty main board (occasional)

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

Unit will not generate sound

Audio alarm or notification sounds fail to play

Ranked causes

1. Faulty speaker assembly (common)
2. Faulty main board (occasional)

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

Unit will not operate on external DC power caution

Equipment fails to operate when powered from external DC source

Ranked causes

1. Faulty DC input jack or cable (common)
2. Faulty PSU power board (occasional)

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

Unit will not operate on external DC power

Device cannot run on external DC power input

Ranked causes

1. Faulty DC input jack or DC cable (occasional)
2. Faulty PSU PWA (occasional)

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

Unit will not perform SpO2 function patient safety

Pulse oximetry (SpO2) measurement not working

Ranked causes

1. Faulty SpO2 PWA assembly (occasional)
2. Faulty main board (occasional)

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

Unit will not produce analog ECG waveform output patient safety

Defibrillator interface or ECG output not functional

Ranked causes

1. Faulty Defib cable assembly (occasional)
2. Faulty main board (occasional)

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

Unit will not produce analog ECG waveform output patient safety

Equipment fails to output ECG signal to external defibrillator or devices

Ranked causes

1. Faulty Defib cable assembly (common)
2. Faulty main board (occasional)

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

Unit will not respond to rotary knob

Rotary encoder control not functioning

Ranked causes

1. Faulty encoder (occasional)
2. Faulty main board (occasional)

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

Unit will not respond to rotary knob

Rotary encoder control on unit does not respond to user input

Ranked causes

1. Faulty encoder (common)
2. Faulty main board (occasional)

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

Calibration: ECG signal detection and waveform display

Verification of ECG simulator signal acquisition, waveform display, paced marker detection, and alarm functions across heart rate range.

Ranked causes

1. ECG lead or connector fault (occasional)

First check

Verify ECG waveform display at 80 BPM

Test point: LCD display waveform and HR indication
Expected: ECG waveform displayed on LCD
Tools: ECG simulator set to 80 BPM Paced, 1.0 mV amplitude

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

Calibration: NIBP leak test caution

Pneumatic system pressure loss rate measurement to verify system integrity before NIBP calibration checks.

Ranked causes

1. Cuff or hose defective or leaking (common)

First check

Run automated leak test from Service Menu

Test point: NIBP Parameter connection
Expected: Leak Test Status displays Passed, Leak Test Results value less than 6, Service Error: None

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

Calibration: NIBP overpressure protection caution

Verification that pump automatically shuts down and releases pressure at safe limits for adult and neonatal cuff settings.

Ranked causes

1. Overpressure valve out of tolerance (occasional)

First check

Verify adult overpressure threshold

Test point: Manometer pressure reading when pump shuts down
Expected: Pump shuts down and pressure released at 300-330 mmHg, 300-330 mmHg
Tools: Manometer, calibration kit 320-246

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

Calibration: NIBP pressure measurement accuracy caution

Verification that PT1 and PT2 pressure transducers read within tolerance at multiple reference pressures to confirm system linearity and accuracy.

Ranked causes

1. Pressure transducers out of calibration (occasional)

First check

Verify PT1 and PT2 pressure at 200 mmHg reference

Test point: Service Menu PT1 Pressure and PT2 Pressure display
Expected: PT1 and PT2 Pressures within 1 mmHg of manometer reading, ±1 mmHg
Tools: Manometer, calibration kit 320-246

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

Calibration: Respiration waveform verification

Verification that respiration waveform and rate readings display correctly at simulated respiration rates.

Ranked causes

1. Respiration sensor or signal processing fault (rare)

First check

Verify respiration waveform at 20 BrPM

Test point: LCD display respiration waveform
Expected: RESP waveform displayed on LCD BrPM
Tools: Respiration simulator, delta ohms 1.0, Lead II, Baseline 1K

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

Calibration: Temperature probe accuracy

Verification that temperature probe readings display within tolerance at multiple reference temperatures and probe connection/disconnection detection.

Ranked causes

1. Temperature probe fault or misalignment (occasional)

First check

Verify temperature reading at 98.6°F

Test point: Monitor temperature display
Expected: Displayed temperature 98.6°F ±0.2°F, ±0.2°F
Tools: IVAC probe simulator TE 1811

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

Error codes

Code	Meaning	Trigger	Severity
`101-ECG`	ECG board data rate error	ECG data acquisition	error
`101 (ECG)`	ECG board data rate error	ECG board data transmission rate incorrect	warning
`101 (Recorder)`	output (to printer) queue overflow	Printer output queue buffer overflowed	warning
`101-Recorder`	Printer output queue overflow	Printer data buffering	error
`101-Respiration`	Memory error at wake up, unable to get data space	Respiration module wake-up	error
`101 (Respiration)`	This means something was wrong with memory at wake up. Couldn't get data space.	Memory allocation failure at system wake-up	warning
`102 (ECG)`	ECG board revision not compatible	ECG board software/hardware revision incompatible with main system	warning
`102-ECG`	ECG board revision not compatible	ECG board identification	error
`102-Recorder`	Printer output queue overflow	Printer data buffering	error
`102 (Recorder)`	output (to printer) queue overflow	Printer output queue overrun	warning
`102 (Respiration)`	Algorithm execution couldn't keep up with data acquisition	Respiration algorithm processing rate too slow	warning
`102-Respiration`	Respiration algorithm execution behind data acquisition	Respiration data processing	error
`103-ECG`	ECG board hardware error	ECG board self-test	error
`103 (ECG)`	ECG board hardware error	Hardware failure detected in ECG board	warning
`103 (Recorder)`	output (to printer) queue overflow	Printer output buffer overflow condition	warning
`103-Recorder`	Printer output queue overflow	Printer data buffering	error
`103-Respiration`	Respiration algorithm execution behind data acquisition	Respiration data processing	error
`103 (Respiration)`	Algorithm execution couldn't keep up with data acquisition	Respiration algorithm lagging behind acquisition	warning
`104 (Recorder)`	input queue (from system) overflow	Printer input buffer from system overflowed	warning
`104-Recorder`	Printer input queue overflow from system	Printer input buffering	error
`104-Respiration`	Respiration algorithm execution behind data acquisition	Respiration data processing	error
`104 (Respiration)`	Algorithm execution couldn't keep up with data acquisition	Respiration algorithm processing too slow	warning
`105 (Recorder)`	queue freeze error	Printer queue processing frozen	warning
`105-Recorder`	Printer queue freeze error	Printer queue operation	error
`109-ECG`	ECG waveform processing too far behind	ECG data processing	error
`109 (ECG)`	Processing of ECG waveform too far behind	ECG waveform processing lagging behind data acquisition	warning
`110`	Overpressure circuit failure	Overpressure detection circuit malfunction	critical
`110`	Overpressure circuit failure	NIBP pressure monitoring	error
`110-Recorder`	Invalid printer speed setting	Printer configuration	error
`110 (Recorder)`	invalid speed setting	Printer speed parameter invalid or out of range	info
`111`	Software error - state machine bad probe number	Temperature monitoring state machine	error
`111-Recorder`	Invalid printer number of waves setting	Printer configuration	error
`111 (Recorder)`	invalid number of waves setting	Printer wave display count parameter invalid	info
`111 (Temperature)`	Software error - state machine bad probe number	Temperature module software detected invalid probe number in state machine	warning
`112`	Overpressure watchdog error	Overpressure watchdog protection circuit failure	critical
`112`	Overpressure watchdog error	Pressure monitoring watchdog	error
`112-Recorder`	Invalid printer density setting	Printer configuration	error
`112 (Recorder)`	invalid density setting	Printer density parameter invalid or out of range	info
`112-Temp`	Temperature sample rate error	Temperature data acquisition	error
`112 (Temperature)`	Temp sample rate error	Temperature sampling rate incorrect	warning
`113 (ECG)`	Data requested from ECG data manager is not available	ECG data manager does not have requested data	warning
`113-ECG`	Data from ECG data manager not available	ECG data request	error
`113-Temp`	Temperature lost synchronization with PIC	Temperature PIC communication	error
`113 (Temperature)`	Temp lost synchronization with PIC	Temperature module lost sync with peripheral interface controller	warning
`114 (ECG)`	Data requested from ECG data manager is not available	ECG data not available in data manager	warning
`114-ECG`	Data from ECG data manager not available	ECG data request	error
`114-Recorder`	Bad command to printer	Printer command transmission	error
`114 (Recorder)`	bad command	Invalid command sent to printer	warning
`114-Temp`	Unable to synchronize with temperature PIC	Temperature PIC synchronization	error
`114 (Temperature)`	Unable to synchronize with the Temp PIC	Failed to establish synchronization with temperature peripheral controller	warning
`115-Recorder`	Bad command to printer	Printer command transmission	error
`115 (Recorder)`	bad command	Invalid printer command detected	warning
`120-Recorder`	Printer queue not initialized	Printer initialization	error
`120 (Recorder)`	queue not initialized	Printer queue data structure not properly initialized	warning
`121 (Recorder)`	annotation queue overflow	Printer annotation buffer overflowed	warning
`121-Recorder`	Printer annotation queue overflow	Printer annotation buffering	error
`122-Recorder`	Invalid printer queue location	Printer queue management	error
`122 (Recorder)`	invalid location	Printer output location parameter invalid	info
`123 (Recorder)`	not enough room	Printer buffer insufficient space for requested output	warning
`123-Recorder`	Printer queue insufficient room	Printer buffer management	error
`125-SPO2`	Too many reset requests from SPO2	SPO2 board operation	warning
`125 (SPO2)`	too many reset requests	SPO2 module reset requested excessively	warning
`126 (SPO2)`	Nellcor has posted a 'serious' FE error	Nellcor SPO2 sensor reports serious functional error	warning
`126-SPO2`	Nellcor posted a serious front-end error	SPO2 Nellcor interface operation	error
`128-132-ECG`	Error generating analog output	ECG analog output generation	error
`128-132 (ECG)`	Errors returned while generating analog O/P (range)	Multiple analog output generation errors detected	warning
`128 (ECG)`	Errors returned while generating analog O/P	Analog output generation failure during ECG processing	warning
`128-ECG`	Error generating analog output	ECG analog output generation	error
`129-SPO2`	SPO2 front-end data OK but processing stalled	SPO2 data processing	error
`129 (SPO2)`	FE data OK - processing stalled	SPO2 functional error data valid but processing halted	warning
`130`	EEProm read failure	Unable to read data from non-volatile EEPROM memory	critical
`130`	EEPROM read failure	EEPROM access during startup	error
`130-SPO2`	Masimo board or diagnostic failure	SPO2 Masimo interface operation	error
`130 (SPO2)`	MASIMO has posted either board or diagnostic failure	MASIMO SPO2 sensor reports board or diagnostic error	warning
`131`	EEProm write failure	Unable to write data to non-volatile EEPROM memory	critical
`131`	EEPROM write failure	EEPROM write operation	error
`131-SPO2`	SPO2 message out of sequence	SPO2 data reception	error
`131 (SPO2)`	msg looks out of sequence	SPO2 board message sequence error detected	warning
`132 (SPO2)`	missing characters inside a packet	SPO2 data packet incomplete or corrupted	warning
`132-SPO2`	Missing characters in SPO2 packet	SPO2 packet reception	error
`133-SPO2`	Unable to correctly set SPO2 parameter	SPO2 parameter configuration	error
`133 (SPO2)`	not able to correctly set parameter	Failed to set SPO2 module parameter	warning
`134 (SPO2)`	NELL_SendCommand() called before previous call completed	SPO2 command sent before previous command processing complete	warning
`134-SPO2`	SPO2 SendCommand called before previous call completed	SPO2 command execution	error
`135-SPO2`	Transmit FIFO full for SPO2 communication	SPO2 data transmission	error
`135 (SPO2)`	Not enough room left in transmit FIFO to send data	SPO2 transmit buffer full	warning
`136 (SPO2)`	Receive FIFO full, probably lost data	SPO2 receive buffer overrun detected	warning
`136-SPO2`	SPO2 receive FIFO full, data lost	SPO2 data reception	error
`137-SPO2`	SPO2 output queue to OEM board full	SPO2 data queuing	error
`137 (SPO2)`	queue out to OEM board is full	SPO2 output queue to OEM board at capacity	warning
`138 (SPO2)`	Nellcor has posted too many auto resets	Nellcor SPO2 sensor auto-reset exceeded acceptable count	warning
`138-SPO2`	Nellcor posted too many auto resets	SPO2 Nellcor operation	error
`139-SPO2`	Nellcor software error	SPO2 Nellcor module operation	error
`139 (SPO2)`	Nellcor software error	Nellcor SPO2 software failure detected	warning
`140`	Transducer initialization failure	Pressure transducer initialization failed during startup	critical
`140`	Transducer initialization failure	Transducer power-up	error
`140-Recorder`	Bad command for printer mode	Printer mode-specific command	error
`140 (Recorder)`	bad command for this mode	Printer command invalid for current operating mode	warning
`140 (SPO2)`	Nellcor has posted too many communication errors	Nellcor SPO2 communication error count exceeded limit	warning
`140-SPO2`	Nellcor posted too many communication errors	SPO2 Nellcor communication	error
`141`	Transducer zero calibration failed	Transducer auto-zero procedure	error
`141`	Calibration of a transducer channel's zero failed	Pressure transducer zero-point calibration failed	critical
`141 (Recorder)`	bad command for this mode	Unsupported printer command in current mode	warning
`141-Recorder`	Bad command for printer mode	Printer mode-specific command	error
`141-SPO2`	No communication with SPO2 board	SPO2 board initialization	error
`141 (SPO2)`	No communication with SPO2 board. Unit may be configured incorrectly	SPO2 board communication failure or non-responsive	warning
`142`	Calibration of a transducer channel's span failed	Pressure transducer span calibration failed	critical
`142`	Transducer span calibration failed	Transducer span calibration	error
`150`	Auto zero failure	Auto-zero calibration procedure	error
`150`	Auto zero failure	Automatic pressure zero calibration failed	critical
`151`	Auto zero verify failed	Verification of auto zero calibration failed	critical
`151`	Auto zero verification failed	Auto-zero verification after calibration	error
`170`	Pump current failure	Pneumatic pump current monitoring	error
`170`	Pump current failure	Pump current measurement out of acceptable range	critical
`171`	Pump current value out of NI_RANGE	Pump current reading outside specified nominal range	critical
`171`	Pump current value out of range	Pump current measurement	error
`180`	Excessive pneumatic leakage detected	Pressure decay monitoring	error
`180`	Excessive leakage	Pressure not maintained in pneumatic system	warning
`190`	Commands out of sequence	NIBP commands received in unexpected order	warning
`190`	Commands received out of sequence	Command sequence validation	error
`200`	Overpressure setpoint not found	Overpressure setpoint determination	error
`200`	Ovp setpoint not found	Overpressure setpoint value not located in memory	critical
`201 (ECG)`	ECG board command queue overrun	ECG board command queue exceeded capacity	warning
`201-ECG`	ECG board command queue overrun	Command queue processing	error
`210`	Pump stuck on during idle	Idle state pump monitoring	error
`210`	Pump stuck on during idle	Pump continues running when it should be idle	critical
`220`	Valve in illegal state	Pneumatic valve position invalid or unknown	critical
`220`	Valve in illegal state	Valve state monitoring	error
`221`	Pressure too high for too long	Pressure threshold and duration monitoring	error
`221`	Pressure too high for too long	System pressure exceeds setpoint for extended duration	critical
`26631`	Operating system 300 Hertz timer re-entry error	OS timer interrupt re-entry detected	critical
`26631`	Operating system 300 Hz timer re-entry error	OS timer interrupt handling	error
`27268`	Unexpected error condition	Software exception handler	error
`27268`	Unexpected error condition	Unexpected error detected by system	critical
`8193`	HW, Time Base Failure	Hardware time base clock failure detected	critical
`8193`	Time base failure	Hardware initialization	error
`8202`	Power supply system failure	Power supply monitoring	error
`8202`	HW, Power Supply System Failure	Power supply or system power failure detected	critical
`8222`	HW, RAM Test Failure	RAM memory test failure during self-test	critical
`8222`	RAM test failure	RAM memory self-test	error
`8232`	ROM checksum failure	ROM integrity check	error
`8232`	HW, ROM Checksum failure	ROM memory checksum verification failed	critical
`8252`	HW, Secondary processor not compatible	Secondary processor compatibility check failed	critical
`8252`	Secondary processor incompatible	Secondary processor detection	error
`8253`	Secondary communications failure	Inter-processor communication	error
`8253`	HW, Secondary communications failure	Communication with secondary processor failed	critical
`SY-16`	Power fail signal true time is too long	Power failure duration exceeds acceptable limit	critical
`SY-16`	Power fail signal duration exceeds threshold	Power supply monitoring	error
`SY-19`	Power supply output out of limits	Software power supply voltage monitoring	error
`SY-19`	Software detected power supply out of limits failure	Power supply voltage measured outside acceptable range	critical
`SY-20`	Checksum of code in Flash Memory is not valid	Flash memory program code checksum verification failed	critical
`SY-20`	Code checksum in flash memory invalid	Flash memory integrity check	error
`SY-40`	Unexpected interrupt occurred	Interrupt handler execution	error
`SY-40`	Unexpected interrupt	Software detected unexpected interrupt signal	critical
`SY-43`	Real time clock (DS1284) running too slow	Real-time clock oscillator frequency too low	warning
`SY-43`	Real time clock running too slow	Real time clock monitoring	warning
`SY-44`	Real time clock running too fast	Real time clock monitoring	warning
`SY-44`	Real time clock (DS1284) running too fast	Real-time clock oscillator frequency too high	warning

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.