Dometic · FreshJet FJZ rooftop air conditioners
E9Compressor or IPM module malfunction
The controller detected a compressor operating fault or a problem in the inverter power module.
What it means
Plain-English answer
Dometic lists inadequate campsite voltage as an initial consideration, followed by authorized service for compressor or IPM diagnosis.
Owner-safe checks
What to check first
- 01
Turn the air conditioner off and disconnect other high-draw RV appliances.
- 02
Check the approved RV voltage monitor or ask campground management to verify pedestal voltage.
- 03
Try only a known-good power source that meets the RV electrical specification.
Safety boundary
Stop and call a technician when
- A breaker trips, wiring smells hot, or voltage remains unstable.
- E9 returns on a verified power source.
Primary reference
Check the exact manual
Applicability: FreshJet FJZ rooftop air conditioners. The data plate and specification letter determine which procedure is correct.
Open Dometic FreshJet FJZ operating manual ↗Source reviewed August 2026