Cummins-Onan QD 10000/12500 (HDKCA/HDKCB) error code 37 (QD)
Invalid set configuration — the continuous 'Stop' input is connected to ground, or the MAT sensor input is not open; checked at every Start or Prime attempt. (Code 37, second-level; Spec F-H service manual A043M526 only)
What to check, and in what order, is in the app. The flow Onan QD 10000 / 12500 (HDKCA / HDKCB, also HDKCC / HDKCD / HDKCG) - start, no-start, codes and power 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, Commercial Mobile HDKCA/HDKCB/HDKCC/HDKCD (Spec F-H), HDKCG (Spec F-G)Cummins Onan