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My air conditioner won't stop running. The fan won't stop on the upstairs unit unless we remove the thermostat from the wall. The condenser runs constantly. It does cool when the thermostat is plugged in. I took at look at the unit and the fan came on, even when I had removed the thermostat. I don't think I have a thermostat issue.

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Does the compressor also run constantly? If it does, the problem with the outside unit may be a stuck contactor. You can remove the cover where the power goes into the outside unit and the contactor should be located near there. If it is stuck, turn off the power to the outside unit and tap the contactor to try to free it, depending on how bad the contacts look, or replace the contactor. As for the indoor fan, you could have a bad fan relay, if that is what your unit has, or a bad fan sequencer, which is what some units use. These components will be located in the air handler. Hope this helps. Let me know what you find if this doesn't help and I can offer more advice based on that.

Posted on Sep 08, 2010

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1. Change your filter regularly. This simple step alone can increase the efficiency of your air conditioner. It will also run less, increasing the life span of your equipment.
2. Wash your condenser coil regularly. Simply turn off your air conditioner, get a garden hose, and spray the coil using an "up/down" pattern. Be particularly attentive if your condenser is close to a dryer vent, or if your neighborhood is full of cottonwood trees. These two items are "air conditioner killers".
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2. These instructions need to be modified slightly for window or "through the wall" type units.
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2. Do not attempt to add or remove refrigerant from your system unless you are licensed by the EPA. Fines and penalties await
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3. Do not attempt to diagnose any electrical problem unless you have been properly trained and/or are licensed.
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