Cummins/Onan — Troubleshoot - Fault Code 1 (High Engine Temperature)
Testing & diagnosis · Cooling System / Control
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Check coolant temperature and coolant level
- Check temperature sender resistance
- Check control plugs fully seated
- Check grounded or shorted sender or gauge lead
- Check sender to control wiring
- Step 02: check raw water flow and raw water impeller
- Step 02: check heat exchanger blockage and pressure cap
Specs & values
- SRT 00-0CV eBay: 1.0 hours step 01, 1.5 hours step 02 at Accessibility Code B
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.