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We have a Bryant 556a model, puron Central air saystem. The air handler unit keeps blowing the 5a fuses. I replaced the filter. I cleaned the main contactor at the compressor. It ran for a couple hours and is now back blowing 5 amp fuses. Help!!

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It sounds like that contactor is the culprit. My reasoning is that after you fooled with it, it worked for a while before resuming the problem A new contactor costs about 15 to 20 bucks and it would be no chore to just hook up the two thermostat wires to the coil from the old contactor. You only need the power from the inside thermostat wiring for this test. Make sure you have pulled the high voltage fuse block power. Simply put the system in the call for cool mode and let the contactor pull in and see if it stays in without blowing the fuse. If after more that 2 hours passes with no problem you know it is the contactor. The only thing left would be to change out the low voltage wiring between the condensing unit and the air handler and next the circuit board. That board will and has failed for my customers but its not too expensive, you might want to shop it. Good luck.

Posted on Jul 04, 2014

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The small wires that go from your furnace to the outside unit could be freyed or bare and touching something or maybe even together. Some time dogs will chew these wires outside or under a house if you have a crawl space. You may need to inspect the wires . If looks bad, you can go to a local hardware store and buy new wiring.

I have seen the contactor also blow this fuse. Especially if the contacted are pitted or at time the 24volt coil will be shorted.

These are the two main problems that could be occurring. Good luck. Mark

Posted on May 24, 2011

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