Error codes › Generator › Cummins-Onan QG i › 25 (QG i DF)

Cummins-Onan QG i error code 25 (QG i DF)

FaultGeneratorVerified against the manufacturer's manual

Alternator Overvoltage. Indicates that the inverter bus voltage 250V, the generator set will not shutdown but without output. DC rail (bus) voltage exceeded 250V. AC output is cut, engine keeps running; a restart is needed to recover. Service order: inverter, then alternator. QG i DF dual-fuel family (QG 7000i DF = HGLCA, QG 4000i DF = HGLDA, QG 2800i DF = HGLEA) code table - distinct from the QG 2800i/2500i (HGLAA) table and from the HGJAA (0983-0501) and KY tables. The status indicator flashes a 1-digit code, or two sets of flashes (tens, pause, units) for a 2-digit code; flashing stops after 5 minutes and pressing STOP/PRIME 3 times within 5 seconds resumes it. The last fault logged keeps flashing after the condition is corrected.

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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