Fault codes / Furrion Chill / E3

Furrion Chill code E3

What it means: Lost communication between the thermostat and the control box.

What to check

Check the A and B wires for damage, swapped A/B, or a loose plug at either end. A pinched wire behind the thermostat plate is common.

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 Furrion Chill codes

• Furrion Chill code E1 Indoor temperature sensor failed
• Furrion Chill: Shuts down, no code 12V below 10V at the control box
• Furrion Chill: Freeze sensor fault Evaporator sensor circuit open
• Furrion Chill: Condenser sensor fault Sensor the unit does not have
• Furrion Chill: Outdoor sensor fault Outdoor sensor failed, whole system down

Full field guide: Furrion Chill rooftop AC

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.