SDMO
SDMO Standby Generators Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
AL01
Generator will not start in AUTO mode; the controller shows AL01, and the start sequence aborts after several crank attempts.
Failed Automatic Start Sequence
AL02
Generator shuts down shortly after start; the controller displays AL02, indicating a low oil pressure shutdown.
Low Oil Pressure Shutdown
AL03
Generator stops, and the controller shows AL03, indicating a high coolant temperature alarm/shutdown.
High Engine Coolant Temperature
AL04
The controller displays AL04, indicating overspeed; the generator stops abruptly during or shortly after start.
Engine Overspeed Protection Trip
AL05
Generator shuts down with AL05, indicating underspeed; the engine runs rough and cannot reach rated frequency.
Engine Underspeed / Underfrequency
AL06
Controller displays AL06, indicating a low fuel level or fuel reserve alarm; the generator may stop or refuse to start.
Low Fuel Level Detection
AL07
The generator stops and the controller displays AL07, indicating a battery low voltage alarm.
Low DC Battery Voltage
AL08
The controller indicates AL08 (battery high voltage); the DC voltage reading is above the normal range.
High DC Battery Voltage
AL09
The generator fails to start; the controller displays AL09, indicating that the emergency stop is active.
Emergency Stop Circuit Activated
AL10
The controller displays AL10, indicating a low coolant level; the generator may not start or may shut down.
Low Coolant Level Detection
AL11
The generator stops with AL11, indicating low fuel pressure or a fuel supply fault.
Low Fuel Pressure Shutdown
AL12
The controller displays AL12, indicating a high fuel level in the bund or a leak detection alarm.
Fuel Leak / Bund High Level
AL13
The generator stops and the controller displays AL13, indicating a mains failure detection fault.
Mains Sensing Circuit Fault
AL14
The controller displays AL14, indicating generator overvoltage; the output voltage exceeds the setpoint.
Generator Overvoltage
AL15
The controller displays AL15, indicating generator undervoltage; the output voltage is below nominal.
Generator Undervoltage
AL16
Controller shows AL16, indicating overcurrent or overload; generator trips off load.
Generator Overload / Overcurrent Protection
AL17
Controller indicates AL17 phase sequence or phase loss; the generator may not connect to the load or ATS.
Phase Sequence / Phase Loss Fault
AL18
Controller shows AL18, indicating frequency out of range; the generator will not connect to the load.
Frequency Out of Limits
AL19
Controller displays AL19, indicating engine stop failure; the engine continues running after a stop command.
Engine Stop Solenoid Failure
AL20
Controller shows AL20, indicating high oil temperature; the engine shuts down.
High Engine Oil Temperature
AL21
Controller indicates AL21, a CAN communication error between the SDMO controller and the engine ECU.
CAN Bus Communication Fault
AL22
Controller shows AL22, indicating sensor failure (generic analog input fault).
Analog Sensor Input Fault
AL23
Controller displays AL23, indicating a glow plug fault on the diesel SDMO standby generator.
Glow Plug Circuit Failure
AL24
Controller shows AL24, indicating air filter restriction or an intake pressure fault.
Air Intake Restriction
AL25
Controller displays AL25, indicating high alternator temperature.
Alternator Overtemperature
Symptom
Automatic transfer switch (ATS) does not transfer to generator during mains failure, although SDMO generator runs normally.
ATS Control / Signaling Fault
Symptom
Blue smoke from the exhaust and noticeable engine oil consumption on the SDMO standby generator.
Oil Burning / Internal Engine Wear
Symptom
Corrosion visible on battery terminals and metal parts inside SDMO generator enclosure; strong smell of battery acid.
Battery Gas Corrosion / Ventilation Issue
Symptom
Excessive black smoke from the exhaust when the SDMO generator is under load.
Overfueling / Incomplete Combustion
Symptom
Excessive white smoke from the exhaust, especially on cold start, with rough running.
Incomplete Combustion / Low Cylinder Temperature
Symptom
Generator cranks but does not start; no error code displayed on the SDMO controller.
No Start Without Fault Code
Symptom
Generator starts but immediately shuts down after a few seconds with no specific code; the controller may show a generic shutdown.
Run-Then-Stop Condition
Symptom
SDMO controller display is blank or intermittent; generator cannot be controlled from panel.
Control Panel Power Loss
Symptom
SDMO generator enclosure becomes very hot; internal components show signs of heat stress but no specific alarm is active.
Inadequate Ventilation / Overheating Enclosure
Symptom
SDMO generator frequency fluctuates under constant load; motors speed up and slow down.
Unstable Speed / Governor Hunting
Symptom
SDMO generator frequently starts and stops for short periods even when load is low or absent.
Nuisance Auto-Start / Cycling
Symptom
SDMO generator output voltage fluctuates noticeably under steady load; lights flicker and equipment behaves erratically.
Unstable Voltage Regulation
Symptom
The generator enclosure or baseframe shows signs of fuel leakage; there is a smell of diesel around the SDMO standby generator.
External Fuel Leak
Symptom
The generator is running under load but produces an unusual loud knocking or metallic noise from the engine compartment.
Engine Mechanical Knock
Symptom
The generator runs but does not take load when the ATS transfers; the main breaker remains open.
Failure to Close Generator Breaker
Symptom
The generator vibrates excessively during operation; the SDMO baseframe shakes and the noise level is high.
Excessive Vibration
Symptom
Visible coolant puddles under the generator or a sweet smell around the SDMO enclosure; the coolant level is dropping over time.
External Coolant Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AL01 |
Generator will not start in AUTO mode; the controller shows AL01, and the start sequence aborts after several crank attempts.
|
Failed Automatic Start Sequence | View Details |
| AL02 |
Generator shuts down shortly after start; the controller displays AL02, indicating a low oil pressure shutdown.
|
Low Oil Pressure Shutdown | View Details |
| AL03 |
Generator stops, and the controller shows AL03, indicating a high coolant temperature alarm/shutdown.
|
High Engine Coolant Temperature | View Details |
| AL04 |
The controller displays AL04, indicating overspeed; the generator stops abruptly during or shortly after start.
|
Engine Overspeed Protection Trip | View Details |
| AL05 |
Generator shuts down with AL05, indicating underspeed; the engine runs rough and cannot reach rated frequency.
|
Engine Underspeed / Underfrequency | View Details |
| AL06 |
Controller displays AL06, indicating a low fuel level or fuel reserve alarm; the generator may stop or refuse to start.
|
Low Fuel Level Detection | View Details |
| AL07 |
The generator stops and the controller displays AL07, indicating a battery low voltage alarm.
|
Low DC Battery Voltage | View Details |
| AL08 |
The controller indicates AL08 (battery high voltage); the DC voltage reading is above the normal range.
|
High DC Battery Voltage | View Details |
| AL09 |
The generator fails to start; the controller displays AL09, indicating that the emergency stop is active.
|
Emergency Stop Circuit Activated | View Details |
| AL10 |
The controller displays AL10, indicating a low coolant level; the generator may not start or may shut down.
|
Low Coolant Level Detection | View Details |
| AL11 |
The generator stops with AL11, indicating low fuel pressure or a fuel supply fault.
|
Low Fuel Pressure Shutdown | View Details |
| AL12 |
The controller displays AL12, indicating a high fuel level in the bund or a leak detection alarm.
|
Fuel Leak / Bund High Level | View Details |
| AL13 |
The generator stops and the controller displays AL13, indicating a mains failure detection fault.
|
Mains Sensing Circuit Fault | View Details |
| AL14 |
The controller displays AL14, indicating generator overvoltage; the output voltage exceeds the setpoint.
|
Generator Overvoltage | View Details |
| AL15 |
The controller displays AL15, indicating generator undervoltage; the output voltage is below nominal.
|
Generator Undervoltage | View Details |
| AL16 |
Controller shows AL16, indicating overcurrent or overload; generator trips off load.
|
Generator Overload / Overcurrent Protection | View Details |
| AL17 |
Controller indicates AL17 phase sequence or phase loss; the generator may not connect to the load or ATS.
|
Phase Sequence / Phase Loss Fault | View Details |
| AL18 |
Controller shows AL18, indicating frequency out of range; the generator will not connect to the load.
|
Frequency Out of Limits | View Details |
| AL19 |
Controller displays AL19, indicating engine stop failure; the engine continues running after a stop command.
|
Engine Stop Solenoid Failure | View Details |
| AL20 |
Controller shows AL20, indicating high oil temperature; the engine shuts down.
|
High Engine Oil Temperature | View Details |
| AL21 |
Controller indicates AL21, a CAN communication error between the SDMO controller and the engine ECU.
|
CAN Bus Communication Fault | View Details |
| AL22 |
Controller shows AL22, indicating sensor failure (generic analog input fault).
|
Analog Sensor Input Fault | View Details |
| AL23 |
Controller displays AL23, indicating a glow plug fault on the diesel SDMO standby generator.
|
Glow Plug Circuit Failure | View Details |
| AL24 |
Controller shows AL24, indicating air filter restriction or an intake pressure fault.
|
Air Intake Restriction | View Details |
| AL25 |
Controller displays AL25, indicating high alternator temperature.
|
Alternator Overtemperature | View Details |
| – |
Automatic transfer switch (ATS) does not transfer to generator during mains failure, although SDMO generator runs normally.
|
ATS Control / Signaling Fault | View Details |
| – |
Blue smoke from the exhaust and noticeable engine oil consumption on the SDMO standby generator.
|
Oil Burning / Internal Engine Wear | View Details |
| – |
Corrosion visible on battery terminals and metal parts inside SDMO generator enclosure; strong smell of battery acid.
|
Battery Gas Corrosion / Ventilation Issue | View Details |
| – |
Excessive black smoke from the exhaust when the SDMO generator is under load.
|
Overfueling / Incomplete Combustion | View Details |
| – |
Excessive white smoke from the exhaust, especially on cold start, with rough running.
|
Incomplete Combustion / Low Cylinder Temperature | View Details |
| – |
Generator cranks but does not start; no error code displayed on the SDMO controller.
|
No Start Without Fault Code | View Details |
| – |
Generator starts but immediately shuts down after a few seconds with no specific code; the controller may show a generic shutdown.
|
Run-Then-Stop Condition | View Details |
| – |
SDMO controller display is blank or intermittent; generator cannot be controlled from panel.
|
Control Panel Power Loss | View Details |
| – |
SDMO generator enclosure becomes very hot; internal components show signs of heat stress but no specific alarm is active.
|
Inadequate Ventilation / Overheating Enclosure | View Details |
| – |
SDMO generator frequency fluctuates under constant load; motors speed up and slow down.
|
Unstable Speed / Governor Hunting | View Details |
| – |
SDMO generator frequently starts and stops for short periods even when load is low or absent.
|
Nuisance Auto-Start / Cycling | View Details |
| – |
SDMO generator output voltage fluctuates noticeably under steady load; lights flicker and equipment behaves erratically.
|
Unstable Voltage Regulation | View Details |
| – |
The generator enclosure or baseframe shows signs of fuel leakage; there is a smell of diesel around the SDMO standby generator.
|
External Fuel Leak | View Details |
| – |
The generator is running under load but produces an unusual loud knocking or metallic noise from the engine compartment.
|
Engine Mechanical Knock | View Details |
| – |
The generator runs but does not take load when the ATS transfers; the main breaker remains open.
|
Failure to Close Generator Breaker | View Details |
| – |
The generator vibrates excessively during operation; the SDMO baseframe shakes and the noise level is high.
|
Excessive Vibration | View Details |
| – |
Visible coolant puddles under the generator or a sweet smell around the SDMO enclosure; the coolant level is dropping over time.
|
External Coolant Leak | View Details |
No matching codes found
Advertisements