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Furnace keeps tripping breaker - Heating & Cooling

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Hi,

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

Posted on Mar 31, 2011

Testimonial: "thanks "

  • garymjr Mar 31, 2011

    what do you do to test transformer if you cant turn on power due tp breaker tripping

  • D. Floyd Kolb
    D. Floyd Kolb Mar 31, 2011

    To test the transformer with no power you can use an OHM meter ... if the primary leads are shorted or go to zero then the transformer could be causing the breaker to trip....
    You also could just unhook the primary leads and then try the breaker... if it stays on you found your problem.

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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.

Feb 20, 2013 | Heating & Cooling

1 Answer

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.

Nov 04, 2012 | Bryant Westinghouse Bqc Quad Circuit...

1 Answer

Furnace keeps tripping the breaker changed breaker and wires all good up to the furnace still keeps tripping when i try to turn power on. nothing happened to the furnace and the wires were tested up to the...


Disconnect the black power wire where it is connected to the furnace with breaker off. Put a wire nut on it and then turn the breaker on. If it continues to trip, the problem is not the furnace and you will have to trace the power wire back to the breaker box to find problem. Next, disconnect the black wire from the breaker (with breaker off) and then snap breaker on. If it trips, bad breaker. If the furnace was disconnected and breaker did not trip, you have a short either on the P C Board or the transformer.

Mar 31, 2011 | Heating & Cooling

1 Answer

Have Challenger Type C 2100 circuit breaker in residential home electrical panel. Manually turned to off position and now cannot turn back on. Pops back to off position. Also says HACR type and common trip...


First HACR is heating, air conditioning,refrigeration. So in other words you could use it on an electric furnace or air conditioning.
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.
If' it IS the main for the panel, turn off all the other breakers in the panel, and try to reset the breaker. If that works, turn the other breakers back on one at a time. IF it "POPS" then it is tripping. Don't keep resetting, find the problem.

Jul 19, 2010 | Challenger Connecticut Electric UBITB-A230...

1 Answer

THERMOSTAT HAS NO POWER


Hi, yes the thermostat feed does come off the furnace from the transformer. That's where it gets it 24 volt supply, 120 volts is stepped down to 24 volts for the controls. If it trips the main breaker, it may be a matter of the wires that feed the breaker are loose and this will cause the breaker to over heat and trip. Shut it off and tighten the wires.The breaker may also be weak. This is a high voltage problem. So, anything that runs off of this breaker can cause it to trip, like the blower motor may be drawing to much amperage. Make sure there is no lint build up on the motor or in the windings or on the blower wheel also. My guess would be the breaker is burned or wires are loose creating enough heat to trip it at times. This is where you will need to start. Keep me posted. If you have a amprobe you can check the rated amps on the data plate of all motors and see what they are drawing under a load. If not, you will have to see whats getting hot, breaker, motors ect. Keep me updated as you will be able to find the problem. Like I said, my bet would be the breaker is going. You can also kill power and pull the breaker to look for any hot or burned spots on it. Concentrate there first.
Best of luck, you should find it quickly.
Shastalaker7

May 24, 2010 | Heating & Cooling

1 Answer

Gas Furnace not working trips breaker


Does it trip the breaker when the safety switch is NOT pressed? I am trying to isolate where to look for the short circuit. Is it before the furnace, or after the furnace. If the breaker trips with the safety switch not depressed, the problem is not the furnace, and could be where power enters the furnace, or further upstream from the furnace.

Dec 13, 2009 | Ruud UBHC Air Conditioner

1 Answer

30 amp breaker trips intermittently


It sounds like this circuit breaker is worn out and needs to be replaced. good luck

Jan 19, 2009 | Siemens 2 pole 30 amp breaker

1 Answer

Electric Furnace Trips Breakers


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

Jan 16, 2009 | Heating & Cooling

1 Answer

Furnace keeps tripping circuit break


Furnace. To confirm use an Ampprobe or other brand ampmeter and see how much current is being drawn. If it is more that 80% of the breaker rating, it si for sure the Furnace.

Jan 10, 2009 | Haier Energy Star ESA3183 Air Conditioner

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