RV thermostat communication error
Use this when an HVAC thermostat shows Er, E1, E3, or zone/control-box communication terms.
Owner-safe checklist
- Record thermostat model and affected zone.
- Turn HVAC off if the zone is not responding.
- Do not open rooftop electrical compartments.
Official sources
- Coleman-Mach 9330-33 Multiple Zone Thermostat Controller System
- Furrion Heat Pump Single Zone Wall Thermostat Quick Start Guide
- Dometic RM3762 RM3962 Refrigerator Operating Instructions
- Dometic RMD10T, RMD10XT Absorption Refrigerator Operating Manual
- Dometic Single Zone LCD Thermostat Operating Instructions
- Dometic RM10.5/RMS10.5 Absorption Refrigerator Operating Manual
- Dometic RMD10.5 Absorption Refrigerator Operating Manual
- Dometic RML10.4 Absorption Refrigerator Operating Manual
- Dometic 3316420.XXX Bluetooth CT Thermostat Operating Instructions
- Lippert QR-187 Correcting E3 Error Code Of Furrion Enhanced Multi Zone Wall Thermostat
- Lippert QR-155 Furrion Thermostat and Controller Compatibility Overview