Dometic · FreshJet FJZ rooftop air conditioners
E2Evaporator coil temperature sensor fault
The control system cannot read the evaporator-coil temperature sensor correctly.
What it means
Plain-English answer
Evaporator temperature feedback helps prevent freezing and controls compressor operation. E2 requires authorized diagnosis.
Owner-safe checks
What to check first
- 01
Turn the air conditioner off.
- 02
Check that return-air filters are clean and airflow openings are unobstructed.
- 03
Allow any visible external ice to thaw without applying heat.
Safety boundary
Stop and call a technician when
- Do not access the rooftop coil or sensor wiring.
- The code returns after filters and airflow are confirmed.
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