New A/C unit tripping breaker.

Old 09-17-23, 12:13 PM
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New A/C unit tripping breaker.

So i just had my AC unit replaced, about a month ago. And it would randomly trip the breaker. AC installer came out and ended up replacing my new unit with another new unit as they believed it was a defect. New unit randomly trips breaker as well. Electrician came over replaced breaker, even though he said it seemed fine, and a factory rep for the AC unit came and expected everything as well. Nothing was found, it had been a couple days since it tripped, so they assumed maybe it was just the breaker. 2 days later… it trips again. Company says they don’t have anything more they can suggest at this point unless it becomes more frequent. Any one have any ideas? Our last AC unit never tripped the circuit, but the compressor ended up going out, it was installed in 2015 so not terribly old. What’s difficult is that it seems to go out completely randomly. Not really dependent on the heat outside or time of day. Tripped 3 out of 4 days then didn’t trip again for a week. Anyway, just thought i would see if anyone here has any theories or ideas. Thanks,

Old 09-17-23, 01:19 PM
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We need to know a couple things that will help us to hopefully help you.

A picture of the label on the outdoor compressor/condenser would be helpful.

Also, learning what size overcurrent protection (circuit breaker amperage or fuse size) is being used to protect the outdoor A/C compressor would be helpful.
Old 09-17-23, 02:31 PM
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Welcome to the forums.

How far is the condenser from the main panel ?
Old 09-17-23, 03:51 PM
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We also need to know what size wire runs from the electrical panel to the outside disconnect and from the disconnect to the unit.

Is the unit a standard A/C unit or is it a heat pump?
Old 09-30-23, 11:03 PM
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if you have a similar breaker, you can try swapping breakers (test if you have a bad breaker)

i don't suggest it - since it's 240V you probably shouldn't be messing with it

(for example - you could get blowback by doing something wrong - a nasty flash in the face even a hospital trip)

Last edited by Tolyn Ironhand; 10-01-23 at 01:39 PM. Reason: Corrected the voltage typo

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