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The fan is working but the air conditioner unit is not working

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Lets take a moment to see what exactly is inside the condenser (that's an outside unit) You have a compressor, a fan, a contactor, a coil, and a capacitor. How does it work? The condenser is connected to the house via an electrical box called a yank out. It is a quick way to kill power to the unit. Note: this is not the breaker to the unit. That would be in the main panel by the meter. People always assume this is the only safety. It is put there by law to kill the power to the unit for service personel. Pull out the connection to kill the power before checking the unit. The first thing to look for is a swolen capacitor the fan is working but the air conditioner unit is - failed%20cap.jpg. If it swells it fails and the unit don't function too well. The next thing to look for is contactor problems. Their are small wires coming from the inside control panel that power up the 24 volt coil that yanks down the contactor. That coil might be bad. If it has no continuity(open) it is in need of replacement. A critter could get between the contacts and fry them as well. Look on the compressor for burnt wires and loose connections (very common). The fan motor should be very easy to turn so if it is stiff then it probably is in need of lubrication. The standard oil in the HVAC world is Zoomoil. It is hi temp resistant, will not lose viscosity and is non flammable. If a weed eater should kill the thermstat wires going outside noting will work because the contactor won't pull down. if the contactor coil is open then it won't pull down and engage the compressor and fan. if a critter crawled under the contacts nothing will happen. of course if the compressor pins are shorted to the copper piping or there is a hole in it or it has an open winding between pins it is shot.

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Posted on Jul 01, 2009



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