Troubleshooting guide
RV thermostat display shows LO, HI, or sensor code
Use this when a thermostat display is outside its temperature range, not matching room conditions, or showing an indoor, outdoor, or freeze-sensor code.
Use this atlas to identify likely meaning and prepare for service. Shut off power, LP gas, fuel, or water when a listed appliance condition involves flame, gas smell, exhaust, generator shutdown, high temperature, moving jacks/slides, refrigerant, 120 VAC, control boards, repeated ignition failure, or a persistent lockout. Call the appliance maker, RV dealer, or a qualified RV technician for repair.
Owner-safe checklist
- Record room conditions.
- Capture thermostat model.
- Avoid changing wiring or internal settings.
Code tables for these appliances
Related fault codes
- Coleman-Mach thermostat code Er
- Coleman-Mach thermostat code HI
- Coleman-Mach thermostat code LO
- Dometic thermostat code E2
- Dometic thermostat code E3
- Dometic thermostat code E4: Open circuit or out-of-range outdoor temperature sensor on select models; heat-pump operation locks out while other modes may continue