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One of my AC units froze up. I cut the unit off. after it defrosted I turned it back on soon after we smelled wires burning. I turned the unit off. Now when I turn the unit on the outside comp. goes on but the air handler will not turn on , I checked the low volt fuse it is fine and ther is no reset switch, what could have happened there are no burnt wires inside the air handler.

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You may have a couple of problems now. The original issue of icing up is most commonly due to low refrigerant in the a/c. For this you will need a professional to correct.

The second problem sounds like it may be a bad capacitor for the indoor blower motor. This is a common occurrence after a system freezes. Often the water that leaks from the A/C will get slung around by the fan causing the water to cause a short on the capacitor. The capacitor is a silver/gray electrical component that usually stands alone from the rest of the circuitry. It is cylinder shaped and has two wires (usually brown) connected to one end of it. It is common practice in the business to replace both the motor and the capacitor after this kind of water damage.

Posted on Jul 07, 2008

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Since you have a knob, I am assuming that this unit has manual controls that are mounted directly below the air conditioner on a ceiling pack. If you smell burned wiring, remove the inside shroud to access the 120VAC connections in the unit. Check these connections for OK, if they look burnt, cut them back and reattach them (be sure to turn the breaker off first). Try the AC again.

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