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Question DetailsAsked on 8/6/2017

I turned off the circuit breaker to my furnace. It now will not turn back on. Do I need to replace the breaker?

I was trying to determine what circuit a bathroom light was on in my home so I could replace the light. One of the breakers I turned off was for the furnace. I can't get the breaker to turn back on now. There are no known malfunctions with the furnace, and it had been working without incident until now. Is this likely just a blown circuit breaker?

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2 Answers


You can replace the breaker. If that does not fix the problem then there is a short or overload on the circuit. In that case, call an electrician.

Answered 3 years ago by Kestrel Electric


As Kestrel says. There should be a switch on the wall within a few feet of the furnace (typically with metallic BX flex conduit leading to it) - try turning that off, then try turning the breaker on. If it stays on, then you likely have a problem in the circuit - perhaps something that was ready to fail and did so when you turned the power off.

Also, on the breaker - if electric furnace (so a 220/240V double breaker) make sure you are moving both the breakers back to on together - some makes do not behave nicely if you only flip one at a time. If 220/240V breaker should have connecting bar like this on them so they theoretically have to trip together - sometimes the tiebar is rigid, sometimes a pin connecting through holes in the two breaker levers.

In older breakers it is not uncommon for them to break when operated - so while the lever/tab may move OK, the innards have disconnected. Main reason you never want to mess with breakers (especially your main breaker) except to turn off in an emergency, or early on a normal work day so there is a good chance of getting it fixed within a few hours without paying overtime rates or having to wait a day or few to get power back.

If bad breaker, typically about $20-50 each depending on brand (50-100% more if 220/240V pair) unless an exotic out-of-production brand, commonly minimum service charge of about $75-150 (though rarely more in a few very high priced areas) for an electrician's labor to replace this.

Answered 3 years ago by LCD

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