Cummins/Onan QST30 — Fault Flash Out

Testing & diagnosis · Diagnostic LEDs

For the Cummins/Onan QST30, from the Cummins/Onan service manual.

Applies to: Cummins/Onan QST30

Procedure

1. First active fault code is flashed out 3 times consecutively.
2. Process advances to next active fault code and flashes it 3 times.
3. After all active faults displayed, process starts over with first fault.
4. Cyclical display continues while Diagnostic Mode is active.

Full service-parts list: Cummins/Onan QST30 →

Source: Cummins/Onan service 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.

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