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Wont turn on at all - Heating & Cooling

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I assume this is a house HVAC unit. Is it a split unit with the fan cooling unit outside and the condenser unit inside the atic or the basement ?

Check the circuit breaker on your house circuit breaker board first that it is not tripped. If its good then continue.

There are many reasons why it may not be working, but one of the first things to check is your starter capacitor.

First turn off the contact breaker for your AC unit at the fuse box in the house, then go to the external units and pull the circuit breaker out where the unit hoses attach to the wall of the house.

Take off the inspection pannel on the rear corner where the hoses enter and exit the External cooling unit and look for a silver can with three spade terminal connections on the top. Its probably about 4 inches high and anything from 1.5 - 3 inches across. It can be a cylinder or a oval cylinder in shape.
Check to see if the capacitor looks like it has had an explosion inside - i.e. the top is bent up in a dome shape or there are holes blown in the top of the capcitor. If that's the case you need it replaced. this is the starter capacitor that helps build the voltage to get the compressor going. Without it working the unit will not start. Depending upon your capacitor rateing you can get them on line around $20, but you have to buy the right rating ( for this you will need to check the labeling on the old capacitor) or if you call an AC company they will charge you about $100 for the same thing.

A great site to go to to find spairs at very reasonable rates and to look for assistance is Arnolds. See here:-

Good luck

Posted on Aug 29, 2008


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