Cummins-Onan QG i error code 26 (QG 2800i/2500i)
Alternator Under Voltage. Permanent Magnet Alternator (PMA) output voltage is out of range low. The generator set will shut down. QG 2800i / 2500i LP (HGLAA) code table - NOT the HGJAA (0983-0501) or KY table; the same number carries a different meaning on those families and on the QG i DF family (see the '(QG i DF)' entries). All HGLAA fault codes shut the generator set down; the status indicator light in the control switch flashes the code.
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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- Operator Manual Generator Set HGLAA Spec A (QG 2800i / 2500i LP), A062Y985 Issue 3Cummins Onan
- Operator Manual Generator Set HGLAA Spec B (QG 2800i / 2500i LP), A075S349 Issue 3Cummins Onan
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