VisionPro IAQ Thermostat Error Codes

Article ID: 94

Last updated: 29 Apr, 2019

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

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Article ID: 94

Last updated: 29 Apr, 2019

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