Onan RV fault codes
Onan (Cummins) generators power many motorhomes. Faults are shown as blink codes on the generator status light or as numeric fault codes on a display panel.
Generator
Fault 2 (Low Oil)
Low oil pressure fault (a first-level fault shown as two… Fault 3
First-level 'service check' fault. Three blinks tell you… Fault 12
Overvoltage fault. The controller could not keep the out… Fault 13
Undervoltage fault. The controller could not hold the ge… Fault 14
Overfrequency fault. The engine governor could not hold … Fault 15
Underfrequency fault. The engine governor could not keep… Fault 19
Governor actuator fault. The controller detected an open… Fault 27
Voltage sense fault. The controller was unable to sense … Fault 29
High battery voltage fault. The voltage across the gense… Fault 31
Overspeed fault. The engine speed exceeded 3400 rpm, so … Fault 32
Low cranking speed fault. During start the engine cranke… Fault 36
Engine Stopped fault. The engine stopped on its own with… Fault 38
Overcurrent (field overload) fault. The generator saw ex…
Low oil pressure fault (a first-level fault shown as two… Fault 3
First-level 'service check' fault. Three blinks tell you… Fault 12
Overvoltage fault. The controller could not keep the out… Fault 13
Undervoltage fault. The controller could not hold the ge… Fault 14
Overfrequency fault. The engine governor could not hold … Fault 15
Underfrequency fault. The engine governor could not keep… Fault 19
Governor actuator fault. The controller detected an open… Fault 27
Voltage sense fault. The controller was unable to sense … Fault 29
High battery voltage fault. The voltage across the gense… Fault 31
Overspeed fault. The engine speed exceeded 3400 rpm, so … Fault 32
Low cranking speed fault. During start the engine cranke… Fault 36
Engine Stopped fault. The engine stopped on its own with… Fault 38
Overcurrent (field overload) fault. The generator saw ex…