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Dometic FreshJet FJX error code E9

FaultAir Conditioning (Rooftop)Verified against the manufacturer's manual

Fault: compressor drive or IPM (inverter power) module. (Dometic FreshJet Series 4/7 rooftop AC - models FJX4333EEH, FJX7333IHP, FJX7337IHP, FJX7457IHP.) Set condition per the service manual: driver or module protection appears 6 times within 30 min.

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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