Dometic · FreshJet FJZ rooftop air conditioners
E3Condenser coil temperature sensor fault
The controller cannot obtain reliable condenser-coil temperature feedback.
What it means
Plain-English answer
E3 concerns the condenser sensor circuit. The system may not protect or regulate the compressor correctly without valid feedback.
Owner-safe checks
What to check first
- 01
Turn the unit off and record when the code appeared.
- 02
Check exterior airflow around the rooftop unit from ground level.
- 03
Confirm campground voltage is not unstable.
Safety boundary
Stop and call a technician when
- Do not climb onto an unsafe roof or open the rooftop housing.
- Arrange authorized service.
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