Honeywell Error Codes — Complete List
| Code | Description | Severity | Difficulty |
|---|---|---|---|
| Aux Heat | Honeywell Thermostat Error Code Aux Heat: How to Fix It | medium | Easy |
| Battery Low | Honeywell Thermostat Error Code Battery Low: How to Fix It | medium | Easy |
| Cool On | Honeywell Thermostat Error Code Cool On: How to Fix It | low | Easy |
| E1 | Honeywell Thermostat Error Code E1: How to Fix It | high | Medium |
| E2 | Honeywell Thermostat Error Code E2: How to Fix It | medium | Medium |
| E3 | Honeywell Thermostat Error Code E3: How to Fix It | medium | Easy |
| E4 | Honeywell Thermostat Error Code E4: How to Fix It | high | Medium |
| E5 | Honeywell Thermostat Error Code E5: How to Fix It | high | Medium |
| Heat On | Honeywell Thermostat Error Code Heat On: How to Fix It | low | Easy |
| Recovery | Honeywell Thermostat Error Code Recovery: How to Fix It | low | Easy |
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