My AC unit has the fan working but not the condenser and I found that one of the two 50 amp fuses was bad. Unfortunately after replacing it, I saw and heard a spark and the new fuse was blown immediately after replacing it. Then I replaced the capacitor (just in case) and checked if there are no loose wires touching around the capacitor area, and pulled some wires going into the fan/condenser unit back and forth just in case some of them were touching around there as well. Then I replaced the fuse again with a new one, and that one was blown immediately again. Thus I've lost 2 additional fuses in 30 minutes just trying to replace the bad one. I measured resistance at 0 by using a multimeter to confirm that the two replacement fuses were good before being blown. What can I do to further investigate the problem without the power/compressor working?
How to investigate a problem with blown 50 amp HVAC fuse without power
air-conditioningcircuit breakerhvac
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Best Answer
The next step is to see where the short is, and for that you will need to check the resistance of the compressor and fan motors. The exact wiring can vary by model, but basically, you need to check the resistance between the wires going to each motor and see if any are shorted.
As a first step, you can probably just check all the wires going to each motor and see if they are shorted to the case of the motor. If a wire breaks internally it can ground out to the motor housing. Beyond that, you need to understand more how the motors are wired.