Fan runs in HEAT but not in A/C mode?


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Old 05-09-22, 06:29 AM
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Fan runs in HEAT but not in A/C mode?

I installed a Honeywell wifi thermostat in the fall and has operated perfectly with heater going. When turning thermostat down for AC mode everything kicks on except the fan. I used to the G wire tutorial for "no C wire" and wondering if there is something I missed. Pics are of the unit label, the wiring at the thermostat and wiring at the control board.





 

Last edited by PJmax; 05-09-22 at 09:53 AM. Reason: resized pics
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Old 05-09-22, 10:01 AM
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Welcome to the forums.

The cable at the furnace and thermostat doesn't match indicating a splice.
You need the red, blue and white jumper to G on the Y terminal.
So.... put the red wire on G. Put the blue wire on Y. Leave the white jumper in place.


 
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Old 05-09-22, 10:45 AM
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Thanks PJ. There doesn't seem to be a change though. Still, the heater and fan kick on when changing to heat but not when switching to AC. I've tried both AUTO and ON settings with COOL and HEAT. The AC unit outside does kick on like it should.. just not the fan at the furnace.

 
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Old 05-09-22, 01:53 PM
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Your furnace picture shows a blue wire while your thermostat shows yellow on Y.
Pretty hard to help without seeing the splice point.

Does the outside compressor start with the wiring as I dictated ?
If yes.... than the blower should also run as you are energizing the condenser and the blower via Y.

Don't forget the Y output is delayed up to five minutes for condenser protection.
 
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Old 05-09-22, 02:00 PM
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The blue wire was spliced with the red wire coming from the unit outside. I can't find where the yellow wire is spliced in? But yes, the AC kicks on as it did previously and now the fan is kicking on as well so all seems good. Thanks for your help!
 
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Old 05-09-22, 02:02 PM
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Ok... so all is good. You're welcome.
 
 

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