Honeywell thermostats are known for their reliability, but occasionally, they may encounter errors. Understanding these error codes can help you troubleshoot issues with your thermostat. Here is a comprehensive list of Honeywell thermostat error codes and their meanings:
E1
Meaning: E1 indicates a loss of communication between the thermostat and the indoor unit.
Solution: Check the wiring connections between the thermostat and the HVAC system. If the issue persists, contact a professional technician for assistance.
E2
Meaning: E2 signifies a low battery or system voltage.
Solution: Replace the thermostat’s batteries. If the error continues, ensure the HVAC system is receiving power, or contact a technician for support.
E3
Meaning: E3 indicates a problem with the thermostat’s memory or settings.
Solution: Try resetting the thermostat to its default settings. If the error persists, contact a technician for further assistance.
E4
Meaning: E4 denotes an outdoor temperature sensor error.
Solution: Ensure the outdoor temperature sensor is properly connected and functioning. If the problem persists, it may require professional attention.
E5
Meaning: E5 represents a compressor relay error.
Solution: Check the wiring and connections related to the compressor relay. If the issue persists, contact a technician for diagnosis and repair.
E6
Meaning: E6 indicates an indoor temperature sensor error.
Solution: Inspect the indoor temperature sensor’s connections and ensure it’s positioned correctly. If the error persists, professional assistance may be needed.
E7
Meaning: E7 signifies an outdoor temperature sensor error.
Solution: Check the outdoor temperature sensor’s connections and positioning. If the issue continues, it may require professional attention.
E8
Meaning: E8 denotes a communication error between the thermostat and the indoor unit.
Solution: Ensure that the thermostat and indoor unit are communicating correctly. Check the wiring and connections. If the problem persists, contact a technician.
E9
Meaning: E9 indicates a problem with the humidity sensor.
Solution: Check the humidity sensor’s connections and ensure it’s functioning correctly. If the error persists, professional assistance may be required.
E10
Meaning: E10 represents a problem with the outdoor coil sensor.
Solution: Inspect the connections of the outdoor coil sensor and ensure it’s working correctly. If the issue continues, professional diagnosis is recommended.
E11
Meaning: E11 denotes a problem with the auxiliary heat.
Solution: Check the auxiliary heat source and its connections. If the error persists, contact a technician for evaluation.
E12
Meaning: E12 signifies a communication error between the thermostat and the outdoor unit.
Solution: Ensure proper communication between the thermostat and outdoor unit. Check wiring and connections. If the problem persists, contact a technician.
E13
Meaning: E13 indicates a problem with the damper or economizer.
Solution: Inspect the damper or economizer for any issues. If necessary, seek professional assistance for repair or replacement.
These error codes may vary depending on your specific Honeywell thermostat model. If you encounter an error code not listed here or are unsure about its meaning, consult your thermostat’s user manual or contact a professional technician for guidance and resolution.
For expert thermostat installation, troubleshooting, and maintenance services in Canada, contact Roma Heating at (604) 704-0300. We are your trusted HVAC partner, providing reliable solutions for Honeywell and other thermostat brands.