FAN will not come on in AC mode

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  #1  
Old 06-05-13, 06:45 PM
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Unhappy FAN will not come on in AC mode

The fan in the furnace box will not come on in auto or fan when the switch is set to cool but will come on if I set it to heat. I have full power everywhere and have even put in a new contactor and capacitor but fan will not come on. I can push in on the contactor and the pump and the out side fan will come on. This is a carrier unit about 7 years old. Does anyone know what else I can check. The light in the furnace box is on and not flashing.
 
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Old 06-05-13, 07:54 PM
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remove the thermostat and short R to G..... Does the fan run when you do this?
 
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Old 06-06-13, 03:44 PM
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yes it does come on thanks
 
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Old 06-06-13, 06:32 PM
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Sounds like the t-stat is bad.
 
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Old 06-06-13, 07:16 PM
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Could be a bad thermostat or just one in need of a bit of programming.
 
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Old 06-06-13, 07:38 PM
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Wink

Well I had already swapped out the thermostat with a know good one but I just went and swapped it again. This time I made sure all wires where tight and guess what it came on. I really thank you guys your suggestion's lead me back to the thermostat and saved me some big $$$$. Thanks
 
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