Cummins-Onan QD 6000/7500/8000 (HDKA) error code 4 (QD HDKA)
Overcrank (4 flashes): cranked without starting. The manual's code list says cranking exceeded 30 seconds; its code section says 35 seconds continuous without the set exceeding about 1200 RPM (from Spec K).
What to check, and in what order, is in the app. The flow Onan QD 6000 / 7500 / 8000 (HDKA inverter) - blink codes and symptoms walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Cummins Onan Service Manual, Onan Generator Set for RV, HDKAH/HDKAJ/HDKAK/HDKAT/HDKAU/HDKAVCummins Onan
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