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

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Compressor runs, but blower won't. System off, fan switch on, blower won't run. Short red and green on back of thermostat starts compressor. Whatever, blower won't run. Can hear relay click on PCB, but blower won't start.

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Dear sir

check pcb board or that cable which one caring electricity till blower check auxiliary relay who is responsible to make active supply for blower it can be faulty you can check by a electrical teaster when your hear sound of active of relay then you check blower electric connection there is electricity or not if there is electricity and blower won,t run it,s mean blower motor /capacitor is faulty if there is no supply for motor blower then it,s mean PCB bord is faulty and it,s need to repair replace.it,s up to you to repair by your self or take help to a technician .

thank you
hope answer the question
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Posted on Oct 01, 2010

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

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If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
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Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

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