The Honeywell VisionPro IAQ Thermostat consists of a 3-wire thermostat and an Equipment Interface Module (EIM).
Errors from the thermostat or system (X/L Terminal) will display an error code and a red light on the thermostat.
Error Codes:
Error Code | Condition |
027 | Faulty thermostat (must be replaced) |
035 | Duplicate thermostat zone detected |
036 | Duplicate UV timer |
037 | Duplicate filter timer |
038 | Duplicate humidifier pad timer |
039 | Duplicate indoor humidity sensor |
040 | 24V detected on X/L terminal |
050 | Duplicate outdoor temp sensor |
052 | Faulty post-coil air sensor |
053 | Faulty outdoor temp sensor |
054 | Faulty indoor humidity sensor |
089 | Heat/Cool equipment is missing |
090 | Data interface is continuously busy |
091 | Thermostat is not receiving data |
118 | Faulty discharge air sensor |
119 | Faulty temperature sensor |
121 | Duplicate post-coil air sensor |