Cummins/Onan — Reading Fault Codes Using Warning/Shutdown Indicators
Testing & diagnosis · Control panel status indicators
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFE, Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSX15 engine
Procedure
- If the Warning or Shutdown status indicator is lit, press and hold the Fault Acknowledge button and release after one second or more.
- The Warning lamp remains on for 2 seconds, then the Shutdown lamp blinks the fault code.
- A three-digit code is three sets of blinks separated by a two-second pause (hundreds, tens, ones).
- The sequence occurs three times per code; the fourth Warning flash indicates the next code.
- Codes are displayed in succession starting with the most recent (up to 32 stored).
- To return to the most recent fault code, press and release the Fault Acknowledge button (less than one second) and repeat.
Specs & values
- Example Code No. 213: Shutdown LED blink-blink-pause-blink-pause-blink-blink-blink; Warning LED blink (2 seconds)
Full service-parts list: Cummins/Onan DFE →, Cummins/Onan DFEJ →, Cummins/Onan DFEK →
Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.