Dometic · FreshJet FJZ rooftop air conditioners
E1Room temperature sensor fault
The controller cannot obtain reliable room-temperature data.
What it means
Plain-English answer
E1 indicates a fault in the ambient room-temperature sensor or its circuit. Automatic temperature control may be unreliable.
Owner-safe checks
What to check first
- 01
Record the displayed code and thermostat model.
- 02
Power-cycle the HVAC system using the RV's normal procedure.
- 03
Keep the thermostat uncovered and away from temporary heat sources.
Safety boundary
Stop and call a technician when
- Do not bypass or heat the sensor to test it.
- Contact Dometic or an authorized service agent.
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