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Why after a loud bang did breaker trip on ac/heat unit. Wont run at all now

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If its a heat pump and the compressor was running, there is a possibility that the compressor itself or something IN the compressor circuit shorted out and tripped the main breaker. It could also be something as simple as a shorted compressor run capacitor.

If its a forced air system with an electric air handler, resistance heat and central air conditioning....it could be just a shorted heating element that tripped a breaker OR it could have been a control circuit short that blew out the non-fused control transformer.

There are only about fifty scenarios that could have happened to cause the noise and to cause the systems failure....but these are the first few basics that could easily be investigated.

Posted on Apr 14, 2015

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It seems the ac developed a dead short, exploded when shorted, then tripped the breaker. Electric test tools will be needed to locate the problem if not located by visual inspection of the electric wiring and components in the line voltage side.

Posted on Apr 14, 2015

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This is not something a home owner should try to troubleshoot, I have see too many owners get in trouble, best thing you can do is call a service man, it may cost a little more but you will get the unit back in service.

Posted on Apr 14, 2015

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