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Outside unit won;t come on blower on furnace inside works central air unit is 5 yrs old

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First check the disconnect/circuit breaker for the outside unit. Then set the thermostat to make the unit come on. Remove the cover on the outside unit where the power goes in so that you can see the contactor. Is the contactor pulled in? If it is, check for proper voltage on the load side of the contactor. If thats good then look at the capacitor. If it looks swollen then it is bad otherwise you can check it with a multimeter or have a heating and air supply check it for you. If the contactor isn't pulled in, remove the face of the thermostat and install a jumper between the R and Y terminals. If the contactor pulls in then, the thermostat is bad. Let me know what you find so I can give you more advice if this doesn't get you going.

Posted on Sep 13, 2010

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