Window air conditioner suddenly randomly tripping circuit breaker
July 9, 2014 8:36 AM Subscribe
We have a window A/C unit that is about three years old. Since we bought it, it has worked flawlessly to cool our bedroom for the few weeks a year that we need it... until now. We put it back in the window last Wednesday, and it worked fine until Monday evening. Now, seemingly without rhyme or reason, but usually (of course) in the middle of the night, it will trip the circuit breaker.
posted by kindall to Home & Garden (14 answers total) 1 user marked this as a favorite
Tripping the breaker is particularly annoying because both my wife and I have sleep apnea and our CPAPs are on that circuit. So we wake to sudden silence unable to breathe.
It first tripped Monday night about 1 AM. I went and reset the breaker and it tripped again two hours later. At that point I reset the breaker again, turned off the A/C, and opened the windows. I started it up again yesterday morning and within thirty minutes, it had tripped the breaker, so I reset the breaker once again and turned it off.
I checked and cleaned the unit's air filter yesterday afternoon, and the A/C ran fine for the rest of the afternoon and well into the night, but again tripped the breaker at about 1:30 AM.
It seems odd to me that the A/C unit would trip the breaker in the coolest part of the night. Indeed, last night, the outdoor air temperature was in the low 60s, cooler than the inside of the house. The compressor shouldn't even be running at that point, I wouldn't think.
Is there an A/C failure mode that would explain this? If it seems obviously an A/C issue I will buy a new one immediately. Alternatively, is it more likely that it's a problem with the circuit breaker? Our house is only about 4 years old so I wouldn't think it would be that.