Honeywell Thermostats Re: Red Light on Thermostat Flashing Some York Heat Pumps have a diagnostic board that will flash a light or display "Error 40" at the thermostat when a fault condition occurs. The light will flash a certain number of times, pause, then flash the same number again. ...

Honeywell Thermostats: VisionPro IAQ Re: Thermostat Shows Error 40 Some heat pumps have a diagnostic board that will flash a light or display "Error 40" at the thermostat when a fault condition occurs. Error Code 40 is displayed on a Honeywell VisionPro IAQ thermostat when it receives a 24V...

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...

Honeywell Thermostat: All Digital Models Re: Constant Flashing WAIT The thermostat appears to never come out of the WAIT timer. The flashing WAIT displayed on a Honeywell digital thermostat indicates that the thermostat is in an Anti-Short-Cycle Delay (ASCD). Qty Possible...