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Carrier air unit kicking on and off within 2 seconds, continually

I have a carrier model FA4ANF04200 central air unit with 38xcc42-3 compressor. It was installed in 2004. I am hearing the AC unit kick on and off several times at night, almost like it has a short. In order to prevent damage I have been turning off the cooling on the thermostat. The fan keeps blowing. I have an auto thermastat hooked up to regulate the temperature. Any ideas of where to start? Did not get a manual when installed and unable to locate the manual on the net.

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Hello friend, from your post I am assuming that when the unit is running it is cooling? Any electrical storms in the area lately? If you are home when you hear one approaching it is always a good ideal to turn off the unit until the storm has passed. One thing that you can check is the low voltage control wires where they make their connection to the unit. Shut the power off to the furnace and the condenser and then take the wire nuts off that are making those low voltage connections and make sure they are connected good. You also at the same time can take off the thermostat from the wall and check it's connections. If no problems there then I would call a service co. before it get's worse. Hope this helps 2rns4u <*{{{>(

Posted on Jul 24, 2009

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