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Electric Furnace Trips Breakers

My home electric furnace has recently started tripping the 50 amp circuit breakers. It's cold outside and the furnace is running quite a bit. It runs through night fine, but sometime during the day it trips the breakers. Reset the breakers and it runs OK through the night and into the next day, but then trips breakers again. Has happened 3 days in a row now. Any idea what the problem could be? Perhaps the fan motor needs an oiling? Thanks.

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It is normal for a breaker that is run right on the edge (50 amp and your furnance to use 45) to get weak after a while . the first thing you should do is change the breaker with the same type and amp rateing . it should take care if it

Posted on Jan 16, 2009

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I have a 21b20m 20kw electric furnace when weather is cold the 100 amp breaker trips two or three times a day can you help please


If you have a heat pump you usually have 1st & 2nd stage emergency heat . Your 2nd set of elements may be bad. You can test this with a meter by ohming across each element and it should read a ohm value. Then ohm from the element to ground and it should read OL if it does not it is shorted. Also 100 amp breakers for some reason always fail I have changed more 100 a breakers than any other size. You can also get an amp probe and turn your thermostat up and read the amp draw to see if it is close to 100a. Hope this helps

Dec 26, 2013 | Electrical Supplies

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Furnace runs awhile then breaker trips


Electric furnace I assume- check with amp meter, if amps are below listed on breaker, replace the breaker, [check both the breakers in the furnace and in the house pannel, even if only one is tripping right now, the other(s) may start doing the same thing after you eliminate the weakest link- don't be surprised!] electric furnaces are notorius for "eating" breakers- they overheat the breakers for years then the breakers get weak and trip too easilly... if gas, post more info and I'll try to help further.

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I have a new furnace and the breaker keeps tripping (20/30). It is a bryant westinghouse box. I think 200 amphes


1) You got a FIRE truck coming.

2) Wire is too small.
Problem is NOT circuit breaker.

3) Both 240Volt appliances on same breaker is a hazard, especially if space available in 200 amp service panel for more breakers.

4) Usually each 240V appliance has separate breaker.

5) Circuit breaker trips because of High heat on the wire.
If wire gets hot, it will start a fire inside the wall.

Electric code requires wire-size match breaker-size.

6) If you put larger amp breaker on same wire that is getting hot, then wire will get hotter.
Result: FIRE truck middle of night with folks jumping out window in glass-cut bare run across yard.

7) Each appliance has volts and watt rating on label.
EVERY appliance has label.

8) For example stove might be rated 8000 watts and 240Volt.
8000 watts divided by 240 volts = 33.3 amps
Stove would require 40 amp breaker and 8 gauge wire.

9) How to figure it out:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-install-a-subpanel.html

10) Do same calculation for new furnace.
12000 watt furnace divided by 240 volts = 50 amps.
Use 60 amp breaker and 6 gauge wire.

11) Summary: fixya wants you to be safe, and buy stuff showing in the ads.
Use a bigger breaker ONLY when bigger wire is also installed.
Call furnace installer, the installer should know to check safe wiring before installing.

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Who made the the idea?


Hi,
Please check the currents draws and check your breaker size. If your furnace always trip off, check the system for malfunction. Normally manufacturer install the breaker with specific standard to protect your furnace from damaged

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IS this the main breaker for the panel? or for and electric furnace. I'm assuming its for the furnace, perhaps back up heat for heat pump. See if there is another disconenct on the furnace, turn it off and see if the breaker resets. IF so you have a short or overload in the furnace.
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If you are not familiar with electrical wiring, I would suggest an electrician. NEVER TRUST COLORS! Most of the time, white goes with white, black with black, red with red, and bare to bare. But depending upon whether this is a 110 or 220 they could be mixed up depending upon how the feed wire is wired at the box. Hope this helps! c

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