Honeywell Thermostat: VisionPro IAQ Re: Error Codes The VisionPro IAQ is a 3-wire communicating thermostat. Error Codes: 027 Faulty thermostat Replace thermostat 035 Duplicate thermostat zone detected Check zone numbers in thermostat configuration 036 ...

Honeywell Thermostat: YTH9421 VisionPro IAQ Re: Installer Setup To Enter Installer Setup: From the home screen, press the System key. (Press Done or Cancel key to return to home screen.) Five blank touch keys show on the bottom of the screen between the Done and Cancel keys. Press and hold...

Honeywell Thermostat: YTH9421 VisionPro IAQ Re: Installer Setup - 3Ht/2Cl Heat Pump To Enter Installer Setup: From the home screen, press the System key. (Press Done or Cancel key to return to home screen.) Five blank touch keys show on the bottom of the screen between the Done and Cancel...

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...