DuroStar
DuroStar 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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E01
Generator will not start and the controller displays E01 immediately after a start attempt.
Low Oil Shutdown / Low Oil Pressure Lockout
E02
Generator shuts down shortly after starting and displays E02 on the controller.
High Engine Temperature / Overheat Shutdown
E03
Controller shows E03 and the generator will not crank when AUTO or MANUAL start is requested.
Battery Voltage Low / Battery Protection Lockout
E04
Generator cranks but does not start; controller displays E04 after several attempts.
No Fuel / Fuel Supply Fault
E05
Generator starts but shuts down within a few seconds and displays E05.
Low Frequency / Engine Speed Out of Range
E06
Controller shows E06 and the generator shuts down when loads are applied.
Overload / Overcurrent Protection Trip
E07
Generator stops and displays E07; AC output voltage is abnormally high or low before shutdown.
Overvoltage / Undervoltage Protection Trip
E08
Controller displays E08 and the generator will not start in AUTO mode when utility power fails.
Utility Sensing Failure / ATS Communication Fault
E09
Generator shuts down and displays E09; fuel level gauge indicates nearly empty.
Low Fuel Level Shutdown
E10
Controller shows E10 and the engine cranks but fails to fire; spark is weak or absent.
Ignition System Fault
E11
Generator shuts down randomly during operation and displays E11.
Engine Overspeed Protection Trip
E12
Controller displays E12 and the generator will not crank; an emergency stop indicator may be lit.
Emergency Stop / Remote Stop Active
E13
Generator attempts to start multiple times, then locks out with E13 on the display.
Start Failure Lockout / Excessive Crank Attempts
E14
Controller shows E14 and the generator shuts down; exhaust appears unusually dark or engine runs roughly.
Fuel System Fault / Rich or Lean Mixture
E15
Generator runs but controller displays E15 and AC output is lost or intermittent.
Alternator Excitation Loss / Field Circuit Fault
E16
Controller shows E16 and the generator shuts down shortly after starting, often with white smoke.
Intake Air Restriction / Air Filter Blockage
E17
Controller displays E17 and the generator will not start; fuel supply appears normal.
Fuel Solenoid / Shutoff Valve Fault
E18
Generator runs but controller shows E18; battery does not charge during operation.
Battery Charging Circuit Fault
E19
Controller shows E19 and the generator shuts down; exhaust may smell of unburned fuel.
Exhaust System Restriction / Backpressure Fault
E20
Controller displays E20 and the generator will not start; gas‑fired models only.
Gas Pressure / Regulator Fault
Symptom
Automatic exercise (weekly self‑test) does not occur at the scheduled time.
Exercise Timer / Scheduler Malfunction
Symptom
Black smoke from exhaust and engine runs rough or lacks power.
Rich Fuel Mixture / Incomplete Combustion
Symptom
Control panel display is blank or unreadable, but generator may still run manually.
Display/Control Panel Failure
Symptom
Corrosion or rust visible on electrical terminals and inside the control panel.
Moisture Ingress / Corrosion Damage
Symptom
Excessive vibration of the generator enclosure during operation; unit may move slightly on its pad.
Excessive Vibration / Mounting Isolation Failure
Symptom
Generator cranks slowly or not at all; no error code displayed on basic control panels.
Weak or Dead Starting Battery
Symptom
Generator enclosure becomes excessively hot to the touch; paint may discolor near exhaust.
Enclosure Overheating / Poor Ventilation
Symptom
Generator fails to transfer load during an outage even though it is running.
Transfer Switch Fails to Transfer
Symptom
Generator runs but produces no AC output; basic models have no error display.
No AC Output from Alternator
Symptom
Generator runs normally but household lights flicker or dim when large loads start.
Transient Voltage/Frequency Sag Under Load
Symptom
Generator starts and stops repeatedly in AUTO mode without transferring load.
Nuisance Start/Stop Cycling
Symptom
Generator starts but immediately stalls when load is applied; lights dim and engine bogs down.
Engine Power Loss Under Load
Symptom
High‑pitched squealing or screeching noise from belt area on liquid‑cooled models.
Accessory Belt Slippage
Symptom
Loud knocking or metallic banging noise from the engine area during operation.
Internal Engine Mechanical Knock
Symptom
Noticeable fuel leak under or around the generator during or after operation.
External Fuel Leak
Symptom
Strong raw fuel smell around the generator with no visible liquid leak.
Fuel Vapor Leak / Venting Issue
Symptom
Visible oil leak under the generator or oil sprayed inside the enclosure.
Engine Oil Leak
Symptom
White or blue smoke from exhaust during startup and operation.
Oil Burning / Incomplete Combustion
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start and the controller displays E01 immediately after a start attempt.
|
Low Oil Shutdown / Low Oil Pressure Lockout | View Details |
| E02 |
Generator shuts down shortly after starting and displays E02 on the controller.
|
High Engine Temperature / Overheat Shutdown | View Details |
| E03 |
Controller shows E03 and the generator will not crank when AUTO or MANUAL start is requested.
|
Battery Voltage Low / Battery Protection Lockout | View Details |
| E04 |
Generator cranks but does not start; controller displays E04 after several attempts.
|
No Fuel / Fuel Supply Fault | View Details |
| E05 |
Generator starts but shuts down within a few seconds and displays E05.
|
Low Frequency / Engine Speed Out of Range | View Details |
| E06 |
Controller shows E06 and the generator shuts down when loads are applied.
|
Overload / Overcurrent Protection Trip | View Details |
| E07 |
Generator stops and displays E07; AC output voltage is abnormally high or low before shutdown.
|
Overvoltage / Undervoltage Protection Trip | View Details |
| E08 |
Controller displays E08 and the generator will not start in AUTO mode when utility power fails.
|
Utility Sensing Failure / ATS Communication Fault | View Details |
| E09 |
Generator shuts down and displays E09; fuel level gauge indicates nearly empty.
|
Low Fuel Level Shutdown | View Details |
| E10 |
Controller shows E10 and the engine cranks but fails to fire; spark is weak or absent.
|
Ignition System Fault | View Details |
| E11 |
Generator shuts down randomly during operation and displays E11.
|
Engine Overspeed Protection Trip | View Details |
| E12 |
Controller displays E12 and the generator will not crank; an emergency stop indicator may be lit.
|
Emergency Stop / Remote Stop Active | View Details |
| E13 |
Generator attempts to start multiple times, then locks out with E13 on the display.
|
Start Failure Lockout / Excessive Crank Attempts | View Details |
| E14 |
Controller shows E14 and the generator shuts down; exhaust appears unusually dark or engine runs roughly.
|
Fuel System Fault / Rich or Lean Mixture | View Details |
| E15 |
Generator runs but controller displays E15 and AC output is lost or intermittent.
|
Alternator Excitation Loss / Field Circuit Fault | View Details |
| E16 |
Controller shows E16 and the generator shuts down shortly after starting, often with white smoke.
|
Intake Air Restriction / Air Filter Blockage | View Details |
| E17 |
Controller displays E17 and the generator will not start; fuel supply appears normal.
|
Fuel Solenoid / Shutoff Valve Fault | View Details |
| E18 |
Generator runs but controller shows E18; battery does not charge during operation.
|
Battery Charging Circuit Fault | View Details |
| E19 |
Controller shows E19 and the generator shuts down; exhaust may smell of unburned fuel.
|
Exhaust System Restriction / Backpressure Fault | View Details |
| E20 |
Controller displays E20 and the generator will not start; gas‑fired models only.
|
Gas Pressure / Regulator Fault | View Details |
| – |
Automatic exercise (weekly self‑test) does not occur at the scheduled time.
|
Exercise Timer / Scheduler Malfunction | View Details |
| – |
Black smoke from exhaust and engine runs rough or lacks power.
|
Rich Fuel Mixture / Incomplete Combustion | View Details |
| – |
Control panel display is blank or unreadable, but generator may still run manually.
|
Display/Control Panel Failure | View Details |
| – |
Corrosion or rust visible on electrical terminals and inside the control panel.
|
Moisture Ingress / Corrosion Damage | View Details |
| – |
Excessive vibration of the generator enclosure during operation; unit may move slightly on its pad.
|
Excessive Vibration / Mounting Isolation Failure | View Details |
| – |
Generator cranks slowly or not at all; no error code displayed on basic control panels.
|
Weak or Dead Starting Battery | View Details |
| – |
Generator enclosure becomes excessively hot to the touch; paint may discolor near exhaust.
|
Enclosure Overheating / Poor Ventilation | View Details |
| – |
Generator fails to transfer load during an outage even though it is running.
|
Transfer Switch Fails to Transfer | View Details |
| – |
Generator runs but produces no AC output; basic models have no error display.
|
No AC Output from Alternator | View Details |
| – |
Generator runs normally but household lights flicker or dim when large loads start.
|
Transient Voltage/Frequency Sag Under Load | View Details |
| – |
Generator starts and stops repeatedly in AUTO mode without transferring load.
|
Nuisance Start/Stop Cycling | View Details |
| – |
Generator starts but immediately stalls when load is applied; lights dim and engine bogs down.
|
Engine Power Loss Under Load | View Details |
| – |
High‑pitched squealing or screeching noise from belt area on liquid‑cooled models.
|
Accessory Belt Slippage | View Details |
| – |
Loud knocking or metallic banging noise from the engine area during operation.
|
Internal Engine Mechanical Knock | View Details |
| – |
Noticeable fuel leak under or around the generator during or after operation.
|
External Fuel Leak | View Details |
| – |
Strong raw fuel smell around the generator with no visible liquid leak.
|
Fuel Vapor Leak / Venting Issue | View Details |
| – |
Visible oil leak under the generator or oil sprayed inside the enclosure.
|
Engine Oil Leak | View Details |
| – |
White or blue smoke from exhaust during startup and operation.
|
Oil Burning / Incomplete Combustion | View Details |
No matching codes found
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