Fault codes / Dometic CCC2 / E7

Dometic CCC2 code E7

What it means: Loss of 120V to the rooftop unit.

What to check

Breaker, the plug in the ceiling box, voltage at the unit. The thermostat (12V) stayed alive, the AC didn't.

Learn the system

• Rooftop AC
• Capacitors
• Airflow and coils
• Thermostats and AC control boards

Practice it on a service call

• AC hums and trips
• AC runs but barely cools
• AC ices up and barely blows

Guided diagnosis

• Air Conditioner
• Thermostat

Other Dometic CCC2 codes

• Dometic CCC2 code E1 Lost communication between thermostat and the rooftop control box
• Dometic CCC2 code E2 Indoor temperature sensor open or out of range
• Dometic CCC2 code E3 Indoor temperature sensor shorted
• Dometic CCC2 code E4 Outdoor temperature sensor open or out of range (heat pump models)
• Dometic CCC2 code E5 Freeze sensor open or out of range
• Dometic CCC2 code E6 Humidity sensor open
• Dometic CCC2 code E8 Invalid zone configuration: DIP switches
• Dometic CCC2 code E9 Invalid zone configuration

Full field guide: Dometic CCC2 thermostat

Codes come from the maker manuals and public service sheets. Your model's own chart always wins, and LP and 120 volt work belongs to a qualified technician.