A/C Air Handler Fan Turning On and Off

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Old 08-10-14, 10:11 AM
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A/C Air Handler Fan Turning On and Off

When my home is at or below the temp my thermostat is set at the air handler fan keeps cycling on and off. Once the temp rises above where I have the thermostat set at it runs fine until the temp goes 2 degrees f below the set temp. Then the cycling starts again. Air is moving well. Just changed the filter and cleaned the condensation drain. Batteries in the thermostat are good. I also cleaned the contacts on the thermostat. The strangest thing to me is that even with the thermostat turned off and even with the thermostat completely disconnected the air handler fan was cycling on and off. It goes on for 3 seconds and off for about 20 seconds.
 
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Old 08-10-14, 12:00 PM
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Welcome to the forums.

It's not a thermostat problem. We'll need the make and model number of your furnace or air handler.
 
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Old 08-10-14, 02:28 PM
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Thanks. It's a separate air handler in the rafters of my garage. I will have to see if I can get someone to climb up there and see what it is.
 
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Old 08-14-14, 05:33 PM
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That was the same thing mine was doing and it turned out to be the motor.
 
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Old 08-14-14, 05:40 PM
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layne.ingle...... when the the temperature is below the thermostat setting the fan should not be coming on at all.
 
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Old 08-14-14, 06:15 PM
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Did you disconnect the thermostat wires at the air handler? Possible but not likely a problem with the Tstat wires,is it only the air handler that cycles or dose the condenser also?
Geo
 
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