I had an electrician out a couple months ago to install a new breaker box. Just recently, my air conditioner stopped working and I had an A/C guy out who diagnosed the issue as a burnt out compressor. He said that the compressor was supposed to only have 40 watts(?) and the fuse that it was connected to was delivering 50. Is this the electrician's responsibility for not checking that the fuse was compatible with my air conditioning unit?
Oversized overcurrent doesn't burn out motors and overcurrent protection doesn't protect against overload. Overcurrent protection on a motor (or compressor) protects the wires if there is a failure on the circuit. The overcurrent will trip if the motor is locked but the motor has to be locked first.
I call bs on the oversized overcurrent burning out the motor. I say the locked compressor tripped the breaker. It's the A/C guy's fault.
The A/C was not working first. So that's when we called the A/C guy. We already had the A/C before the breaker box was installed. The A/C guy didn't do anything, he just ruled out all the other things and found a dead compressor.
That's quite a smart AC guy who knows what took out that compressor. He must have a BS degree. I had a guy BS my aunt that way once. He very eloquently defended his BS actions while he refunded her $$$. Joe
The solution was to replace the compressor so the compressor must have been the only problem.
If the A/C guy had to replace something else and the compressor, there might be a chance a smaller breaker could have saved the compressor if the "something else" might have caused the compressor to stall. If the something else just caused the compressor to overload, its internal overload protection should have handled that. Breakers don't protect against overload.
The A/C guy said the reason the compressor failed is that the breaker was too big, I have to wonder what motivated that. I don't think that idea will fly.
Sometimes compressors fail.
Still the breaker should be properly sized to protect the conductors. You might be able to stick the electrician with that cost. He relied on the guy before him to properly size the breaker. Maybe you can get the original installer to pay for the breaker.
Hi there, Did the A/C guy actually state HOW the compressor was faulty? Usually, the guy would need to put a megohm meter on it to check the winding resistances to ground and the actual winding resistances themselves, did he provide you with any test results after coming to that conclusion?
It isn't unusual for compressors to fail because of a voltage spike, no CB or fuse will ever protect against something like that, I've seen this happen quite a few times You didn't state how old the A/C unit was in your OP?
I would find it pretty tenuous to blame an A/C unit failing because of a panel upgrade.