Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Blower Turns off if ac unit comes on. No air coming through vents

I had a brown out so I turned off the air. The power came back on and I came home and turned on the air conditioning and the outside unit is working but the furnace doesn't blow the cold air into the house.. I have checked for frozen lines and there are none. I turn the air off and the fan to on and there is air coming out of the vents inside the house so I turned the air on and then the air quits coming out of the vents. Please help:)

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  • miyoshi21 Aug 26, 2008

    Is the circuit board something a do it yourselfer could fix? I have never worked on a furnace/air conditioner but I do work on cars and other things around the house.

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1 Answer

This only could 1--2 things, a bad circuit board fan relay or bad thermostat. To check for bad thermostat, take off the front cover to reveal the 4-wire terminial and jump the red-wire (power)-cool,(yellow -y or blue)--- green--fan white-(heat)..........red to yellow-or y=cool. Thank-you-very-much!

Posted on Aug 25, 2008

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