Cummins-Onan KY error code 12 (KY)
Over Voltage — the control is unable to maintain rated output voltage.
What to check, and in what order, is in the app. A step-by-step flow walks this code with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Onan RV Generator Set KY Operator ManualCummins-Onan
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