SDMO
SDMO Standby Generators Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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AL01
Generator will not start in AUTO mode; controller shows AL01 and start sequence aborts after several crank attempts.
Failed Automatic Start Sequence
AL02
Generator shuts down shortly after start; controller displays AL02 indicating low oil pressure shutdown.
Low Oil Pressure Shutdown
AL03
Generator stops and controller shows AL03 high coolant temperature alarm/shutdown.
High Engine Coolant Temperature
AL04
Controller displays AL04 indicating overspeed; generator stops abruptly during or shortly after start.
Engine Overspeed Protection Trip
AL05
Generator shuts down with AL05 indicating underspeed; engine runs rough and cannot reach rated frequency.
Engine Underspeed / Underfrequency
AL06
Controller shows AL06 indicating low fuel level or fuel reserve alarm; generator may stop or refuse to start.
Low Fuel Level Detection
AL07
Generator stops and controller displays AL07 indicating battery low voltage alarm.
Low DC Battery Voltage
AL08
Controller indicates AL08 battery high voltage; DC voltage reading is above normal range.
High DC Battery Voltage
AL09
Generator fails to start; controller shows AL09 indicating emergency stop active.
Emergency Stop Circuit Activated
AL10
Controller displays AL10 indicating low coolant level; generator may not start or may shut down.
Low Coolant Level Detection
AL11
Generator stops with AL11 indicating low fuel pressure or fuel supply fault.
Low Fuel Pressure Shutdown
AL12
Controller shows AL12 indicating high fuel level in bund or leak detection alarm.
Fuel Leak / Bund High Level
AL13
Generator stops and controller displays AL13 indicating mains failure detection fault.
Mains Sensing Circuit Fault
AL14
Controller shows AL14 indicating generator overvoltage; output voltage exceeds setpoint.
Generator Overvoltage
AL15
Controller displays AL15 indicating generator undervoltage; 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; generator may not connect to load or ATS.
Phase Sequence / Phase Loss Fault
AL18
Controller shows AL18 indicating frequency out of range; generator will not connect to load.
Frequency Out of Limits
AL19
Controller displays AL19 indicating engine stop failure; engine continues running after stop command.
Engine Stop Solenoid Failure
AL20
Controller shows AL20 indicating oil temperature high; engine shuts down.
High Engine Oil Temperature
AL21
Controller indicates AL21 CAN communication error between SDMO controller and 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 glow plug fault on diesel SDMO standby generator.
Glow Plug Circuit Failure
AL24
Controller shows AL24 indicating air filter restriction or intake pressure fault.
Air Intake Restriction
AL25
Controller displays AL25 indicating alternator temperature high.
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 exhaust and noticeable engine oil consumption on 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 exhaust when SDMO generator is under load.
Overfueling / Incomplete Combustion
Symptom
Excessive white smoke from 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 SDMO controller.
No Start Without Fault Code
Symptom
Generator enclosure or baseframe shows signs of fuel leakage; smell of diesel around SDMO standby generator.
External Fuel Leak
Symptom
Generator is running under load but produces unusual loud knocking or metallic noise from engine compartment.
Engine Mechanical Knock
Symptom
Generator runs but does not take load when ATS transfers; main breaker remains open.
Failure to Close Generator Breaker
Symptom
Generator starts but immediately shuts down after a few seconds with no specific code; controller may show generic shutdown.
Run-Then-Stop Condition
Symptom
Generator vibrates excessively during operation; SDMO baseframe shakes and noise level is high.
Excessive Vibration
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
Visible coolant puddles under generator or sweet smell around SDMO enclosure; coolant level dropping over time.
External Coolant Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AL01 |
Generator will not start in AUTO mode; controller shows AL01 and start sequence aborts after several crank attempts.
|
Failed Automatic Start Sequence | View Details |
| AL02 |
Generator shuts down shortly after start; controller displays AL02 indicating low oil pressure shutdown.
|
Low Oil Pressure Shutdown | View Details |
| AL03 |
Generator stops and controller shows AL03 high coolant temperature alarm/shutdown.
|
High Engine Coolant Temperature | View Details |
| AL04 |
Controller displays AL04 indicating overspeed; generator stops abruptly during or shortly after start.
|
Engine Overspeed Protection Trip | View Details |
| AL05 |
Generator shuts down with AL05 indicating underspeed; engine runs rough and cannot reach rated frequency.
|
Engine Underspeed / Underfrequency | View Details |
| AL06 |
Controller shows AL06 indicating low fuel level or fuel reserve alarm; generator may stop or refuse to start.
|
Low Fuel Level Detection | View Details |
| AL07 |
Generator stops and controller displays AL07 indicating battery low voltage alarm.
|
Low DC Battery Voltage | View Details |
| AL08 |
Controller indicates AL08 battery high voltage; DC voltage reading is above normal range.
|
High DC Battery Voltage | View Details |
| AL09 |
Generator fails to start; controller shows AL09 indicating emergency stop active.
|
Emergency Stop Circuit Activated | View Details |
| AL10 |
Controller displays AL10 indicating low coolant level; generator may not start or may shut down.
|
Low Coolant Level Detection | View Details |
| AL11 |
Generator stops with AL11 indicating low fuel pressure or fuel supply fault.
|
Low Fuel Pressure Shutdown | View Details |
| AL12 |
Controller shows AL12 indicating high fuel level in bund or leak detection alarm.
|
Fuel Leak / Bund High Level | View Details |
| AL13 |
Generator stops and controller displays AL13 indicating mains failure detection fault.
|
Mains Sensing Circuit Fault | View Details |
| AL14 |
Controller shows AL14 indicating generator overvoltage; output voltage exceeds setpoint.
|
Generator Overvoltage | View Details |
| AL15 |
Controller displays AL15 indicating generator undervoltage; 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; generator may not connect to load or ATS.
|
Phase Sequence / Phase Loss Fault | View Details |
| AL18 |
Controller shows AL18 indicating frequency out of range; generator will not connect to load.
|
Frequency Out of Limits | View Details |
| AL19 |
Controller displays AL19 indicating engine stop failure; engine continues running after stop command.
|
Engine Stop Solenoid Failure | View Details |
| AL20 |
Controller shows AL20 indicating oil temperature high; engine shuts down.
|
High Engine Oil Temperature | View Details |
| AL21 |
Controller indicates AL21 CAN communication error between SDMO controller and 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 glow plug fault on diesel SDMO standby generator.
|
Glow Plug Circuit Failure | View Details |
| AL24 |
Controller shows AL24 indicating air filter restriction or intake pressure fault.
|
Air Intake Restriction | View Details |
| AL25 |
Controller displays AL25 indicating alternator temperature high.
|
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 exhaust and noticeable engine oil consumption on 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 exhaust when SDMO generator is under load.
|
Overfueling / Incomplete Combustion | View Details |
| – |
Excessive white smoke from 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 SDMO controller.
|
No Start Without Fault Code | View Details |
| – |
Generator enclosure or baseframe shows signs of fuel leakage; smell of diesel around SDMO standby generator.
|
External Fuel Leak | View Details |
| – |
Generator is running under load but produces unusual loud knocking or metallic noise from engine compartment.
|
Engine Mechanical Knock | View Details |
| – |
Generator runs but does not take load when ATS transfers; main breaker remains open.
|
Failure to Close Generator Breaker | View Details |
| – |
Generator starts but immediately shuts down after a few seconds with no specific code; controller may show generic shutdown.
|
Run-Then-Stop Condition | View Details |
| – |
Generator vibrates excessively during operation; SDMO baseframe shakes and noise level is high.
|
Excessive Vibration | 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 |
| – |
Visible coolant puddles under generator or sweet smell around SDMO enclosure; coolant level dropping over time.
|
External Coolant Leak | View Details |
No matching codes found
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