Error codes › Generator

Generator error codes

105 codes from 8 manufacturers, each with its meaning and the document it comes from. Open a code for the details, or search every system.

Cummins Onan (3)

58 (Exhaust Gas Temperature Shutdown)Exhaust gas temperature reached 650C (1202F) for 2 seconds while the set was running. See an authorized Onan…
81 (EGT Sensor Open)Exhaust Gas Temperature sensor stuck open (open circuit). Authorized dealer service required.
82 (EGT Sensor Shorted)Short circuit in the Exhaust Gas Temperature sensor. Authorized dealer service required.

Cummins-Onan EC-30W (5)

Failed to StartEC-30W commanded genset to start, but genset did not start after three crank attempts. AGS disables.
Failed to StopEC-30W commanded genset to stop, but genset continued running. AGS disables.
Motion FaultAccelerometer diagnostics failed. AGS is disabled.
Display BatteryDisplay battery voltage too low for AGS operation. Genset stops and AGS disables.
Verify MotionEC-30W has not detected any motion in last 30 days. AGS disables.

Cummins-Onan KY (19)

3 (KY)Service Check fault (first-level code) - it indicates a second-level fault code; press STOP once to display it
4 (KY)Overcrank — cranked >20 sec without start
13 (KY)Undervoltage - the controller is unable to maintain rated output voltage.
14 (KY)Overfrequency - the engine governor is unable to maintain rated frequency.
15 (KY)Underfrequency - the engine governor is unable to maintain rated frequency.
29 (KY)Battery voltage >19 V
12 (KY)Over Voltage — the control is unable to maintain rated output voltage.
27 (KY)Voltage Sense — the control is unable to sense output voltage.
32 (KY)Low Cranking Speed — cranking speed is less than 180 RPM for more than 2 seconds.
35 (KY)Control Card Failure — a microprocessor EEPROM error occurred during self-test.
36 (KY)Engine Stopped — the engine stopped without receiving a command from the control.
37 (KY)Invalid Generator Set Configuration - the genset configuration is preprogrammed at the factory; an invalid…
38 (KY)Over Current (Field Overload) — low power-factor loads.
41 (KY)Generator Rotor — the control is unable to sense field or output voltage.
42 (KY)Processor — a microprocessor ROM error occurred during self-test.
43 (KY)Processor — a microprocessor RAM error occurred during self-test.
45 (KY)Speed Sense — the control is unable to sense quadrature frequency.
47 (KY)Ignition — the control is unable to sense ignition.
48 (KY)Generator Field Sense — the control is unable to sense field voltage.

Cummins-Onan QD (23)

3 (QD)Service check — a second-level fault is stored. Press Stop once to make the status lamp blink the two-digit…
4 (QD)Overcrank — generator failed to start within the cranking time allowed. (4 amber blinks)
12 (QD)Over-voltage — automatic shutdown (after voltage regulation was enabled, output rose above 150 VAC [125% of…
13 (QD)Under-voltage — automatic shutdown (after voltage regulation was enabled, output fell below 108 VAC [90% of…
14 (QD)Over-frequency — automatic shutdown (after the starter engaged, frequency rose above 70 Hz for 40 ms, or…
15 (QD)Under-frequency — automatic shutdown (during normal operation, frequency fell below 54 Hz for more than 8 s).…
19 (QD)Actuator shorted or open — at startup the controller sensed an open or shorted governor actuator or harness.…
22 (QD)Actuator overload — the controller held the governor actuator at full duty cycle (maximum PWM) for 60 s…
24 (QD)Faulty engine temperature sender — after 10 minutes of normal operation the controller sensed an open…
27 (QD)VAC sense lost — the controller lost AC-voltage sensing during normal voltage regulation while the field was…
29 (QD)High battery voltage — the controller sensed battery-system voltage greater than 19.2 V (at startup, or for 1…
32 (QD)Starting fault — the controller could not detect cranking speed (quadrature zero crossings) for 12 s. (Code…
35 (QD)EE checksum fault — at startup the controller detected an EEPROM memory error. (Code 35, second-level)
36 (QD)Mechanical fault — engine speed fell below 1000 RPM for 0.5 s (not by controller action). (Code 36…
38 (QD)Field overload — during normal voltage regulation, field voltage exceeded 180 VAC for 10 s. (Code 38…
41 (QD)Generator rotor short — while flashing the field the controller sensed the rotor circuit shorted to ground.…
42 (QD)ROM fault — at startup the controller detected a ROM memory error. (Code 42, second-level)
43 (QD)RAM fault — at startup the controller detected a RAM memory error. (Code 43, second-level)
45 (QD)Speed sense lost — after start disconnect the controller lost speed sense (quadrature zero crossings) for…
48 (QD)Loss of field sense — the field-sense circuit on the controller board failed during normal voltage…
57 (QD)Overprime — the local or remote control switch was held in the PRIME (Stop) position for more than 3 minutes.…
1 (QD)High engine temperature — automatic shutdown (engine coolant temperature exceeded 239 °F / 115 °C for 10 s).…
2 (QD)Low oil pressure — automatic shutdown (engine oil pressure dropped to less than 14 psi for 3 s, oil-pressure…

Onan HGJAA-HGJAF (27)

1 blinkFirst-level shutdown: high engine coolant temperature (where equipped).
2 (Low Oil Pressure)First-level fault. Low-oil-pressure cutoff switch did not open (switch grounded at controller P1-6).…
3 (Service Check)First-level fault indicating a two-digit fault code is logged. While LED is flashing 3x, press STOP once to…
4 (Overcrank)First-level fault. Cranking exceeded 30 seconds without engine starting. Controller cannot sense generator…
12 (Overvoltage)Controller unable to maintain rated voltage. Instantaneous: AC S1-S2 >150 VAC. Delayed: 138-150 VAC for 3…
13 (Undervoltage)Controller unable to maintain rated voltage. AC S1-S2 below 108 VAC for 5 continuous seconds.
14 (Overfrequency)Instantaneous: freq >70 Hz (60 Hz set) or >58 Hz (50 Hz set). Delayed: 66-70 Hz for 6 sec (60 Hz) or 55-58 Hz…
15 (Underfrequency)Engine governor unable to maintain rated frequency. 60 Hz carburetor models: <54 Hz for 30 continuous…
17 (Fuel Pump Fault)Pre-2001 models only. Controller detected an OPEN fuel pump circuit at the control (the manual's FC 17 logic…
23 (Oil Pressure Switch Fault)Pre-2001 models only. Continuous open on oil pressure switch input before cranking (not a running fault).…
27 (Voltage Sense Lost)Controller unable to sense output voltage (sense lead open, blown sense fuse, or field collapse). Manual…
29 (High Battery Voltage)Voltage across battery system greater than 19 VDC.
32 (Low Cranking Speed)Cranking too slow: quadrature frequency ≤3 Hz AND engine RPM ≤100 RPM for 12 continuous seconds after…
33NOT ASSIGNED. If seeing blink pattern that looks like 33, it is actually first-level code 3 (Service Check) …
35 (Control Card Failure)Microprocessor EEPROM error during self-test.
36 (Engine Stopped Without Fault)Engine stopped without command by controller. Manual logic: RPM less than 500 AND sense voltage S1-S2 at 0…
37 (Invalid Configuration)Wrong frequency/RPM ratio detected (configuration mismatch).
38 (Field Overload / Overcurrent)Field voltage F1-F2 greater than 150 VDC for 10 continuous seconds.
41 (Alternator/Generator Rotor Fault)Post-2003 models only. Field voltage F1-F2 = 0 VDC AND sense voltage S1-S2 = 0 VAC for 1 continuous second…
42 (Processor Fault - ROM)Microprocessor ROM error during self-test.
43 (Processor Fault - RAM)Microprocessor RAM error during self-test.
44NOT ASSIGNED. If seeing blink pattern that looks like 44, it is actually first-level code 4 (Overcrank).
45 (Speed Sense Fault)Controller unable to sense quadrature frequency (Q1-Q2 signal lost; the Q1-Q2 winding generates the…
47 (Ignition Fault)Controller unable to sense ignition pulses (used for RPM input). On HGJAB and HGJAE the fault is enabled only…
48 (Field Sense Fault)Controller unable to sense field voltage.
51 (Processor Failure)Microprocessor malfunction.
57 (Overprime Fault)Prime mode (STOP/PRIME held) exceeded 3 minutes.

Onan HGJAA-HGJAF (EFI) (5)

19 (Governor Actuator Fault)EFI only. Controller sensed open or shorted circuit in throttle body/governor actuator.
22 (Governor Actuator Overload)Pre-2001 EFI models only. Maximum governor output (PWM) sustained for 10 continuous seconds (operation at or…
52 (Fuel Injector Fault)EFI only. Open or short circuit in fuel injector.
54 (MAT Sensor Fault)EFI only. Open or short circuit in MAT sender. Manual threshold: MAT sender input greater than 300k Ohms.
56 (MAP Sensor Fault)EFI only. Open or short circuit in MAP sender. Manual threshold: MAP sensor input less than 50 kPa at start.

Onan HGJAA-HGJAF (HGJAD/E/F) (1)

31 (Overspeed)Overspeed (per source manual ch.12.25, only triggered in ERO/Engine Run Only mode): 5 kW sets >2880 RPM via…

Xantrex AGS (22)

Gen Won't StartGenerator failed to start after four attempted cranking cycles over 12-minute period
Gen Quiet FaultAutomatic generator start condition met during programmed quiet-time window; alerts user that generator will…
Low AC Input VAC input voltage drops below 45 VAC (Power Tech generators only); indicates weak generator output or…
W200Generator was stopped manually.
W201Generator was started manually.
W202Unable to start generator. AGS will try again.
W203Manual Off: Max generator run time reached. Reset AGS Mode.
W204Manual Off: Max generator cycles reached. Reset AGS Mode.
W205Generator started by its switch. Use its switch to stop.
W206Mismatched triggers. Enable stop trigger or disable start trigger.
W207Mismatched triggers. Enable start trigger or disable stop trigger.
W208Auto triggers not enabled. Config auto triggers
W209Gen external stop. Start gen via its control panel.
W250The selected value failed to change. Try again.
W500Network connection lost. Check connections.
W501AGS has fixed memory problem and restored default settings.
F200Exceeded max number of start tries. Check gen, clear fault.
F201Unable to stop gen. Stop gen via its control panel.
F203Manual Off: Gen stopped by ext sensor. Reset AGS mode.
F500Serial Number Failure, Service Required.
F501Memory Failure. Service Required.
F505Internal Failure. No Service Required. A controller fault has occurred and the Auto Gen Start has gone into…