• Air handler blows and stops repeatedly

    Feb.6.2012

    My AC unit, whether cooling or heating, clicks at the thermostat like it is starting cycle when the temperature is reached to start. However, the air handler blows and stops, blows and stops continuously. The outside unit (compressor) does not start.

    tim, Phoenix, AZ

    A safety switch in the furnace typically is the cause of the air handler blowing and stopping like yours does. If something malfunctions during the ignition of the furnace, there is a safety that turns off the gas valve and turns the fan on to cool the heat exchanger down. It differs between manufacturers, but sometimes after the fan runs for a short while it cycles everything off, then tries the ignition sequence again. If it malfunctions again, it will repeat the cycle. I would recommend leaving it off and getting a trained technician, like the ARS/Rescue Rooter branch in Phoenix, AZ, Goettl Air Conditioning, at (602) 275-1515, to diagnose this. It could be minor but it also could be a major malfunction and safety issue. No sense in taking a chance.  

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