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Breaker tripping when furnace is on

Look at the coils they look ok and the fuse box looks alright to the main breaker box gets real hot when the furnace is on for about 15 min then blows the fuse replaced the two 60 amp fuses and also the main 200 amp but still goes out some one said they might have put the wire to the furnace backwards but it the same problem as before wondering if the little dieod that in the mid of the unit on the blow box might be bad the one on the top looks alright but the one on the bottom looks lik it has some stuff on it and if theres a tool or meter that has a surge reader on it to tell me what breaker it is

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Check ground wires

Posted on Jan 05, 2009

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How do I know if a fuse is blown in an electric mobile home furnace? Nordyne


trip main breaker in breaker panel, open up furnace and open small door at bottom to access electrical wiring. most of the time on older furnaces , fuse is in series with low voltage red wire..

Feb 18, 2015 | Heating & Cooling

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Brand new furnace wont start its a aruf 14 electric air handler with a 10 amp heater coil


the 3 amp fuse protects low voltage side of transformer. if it's blowing on a call for cooling wire pair going to outside unit bad or contactor in outside unit.

Nov 18, 2013 | Goodman Heating & Cooling

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My unit is tripping the main breaker what should i look at first


With this cold weather, -- it is not likely tripping off because it is too hot!

Are you familiar with the history of this unit?-- Like has it tripped in the past during HOT weather?
This might be a clue, that the circuit is really loaded close to its limit--

This leads to the next possibility: That the breaker is getting weak (They do after many hard starting loads!
Now-- If you can get the system to start and run for just a few seconds-- can you put a Clamp around Amp meter on the wires?-- and read the full load current?
How close is this to the rating of the circuit breaker?
Is the breaker, and the wire size marginal?

Another thing to look for, is loose lug screws at the main fuses, and the Main contactors, and the motor leads--- for loose wires result in overheating, which raises the current, and leads to tripping, too.

How long ago was the condenser cleaned-- this leads to high amp draw too.

But the first thing would be to learn more about the age of the Main Breaker, and what the 'normal' run current is for that system.

Mack B

Dec 28, 2010 | Carrier 38CKC036 Air Conditioner

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

3 Answers

The a/c unit outside doesnt come on but the fan inside of the house is blowing, the unit is not cooling the house. I have a goodman unit.


Hi, this is a split system Goodman. With the j36 in the model number, that tells me it is a 3 1/2 ton unit. If the outdoor condensing unit is off and doing nothing at all, no fan on top running, no compressor or anything, it sounds as though you have lost power to it. The high voltage to the outdoor unit is seperate from the indoor unit. When it is not running, you have only warm air from the indoor unit. Before I have you do anything, go out to the unit. Take a water hose being careful not to bend the fins on the coil, and wash just the coil very good. If its dirty, it can cause the pressures in the system to rise very high and blow a fuse or trip a breaker. When you are done washing it, you should have a electrical box mounted on the wall that feeds power to this unit. First, find your main breaker box to your home. It should be where the meter is. Find it and it will have several different breakers in it. They may or may not be marked. Look for a double - pole 30 to 40 amp breaker that should say a/c, if it was marked. If not, look and touch them, it will be 2 breakers together and feel if they are tripped. If so, turn it off with a hard motion. Then, back on the same way. Watch to see if it holds and does not trip on you. If its ok, go to the outdoor unit. Make sure the thermostat is on auto/cool and turned way down for it to come on. If it was a breaker and its running, more then likely the dirt from coil caused it to over amp and trip. Now, if there is power and breaker is on but still not on, open the box at the unit. It may have a pull out type plug, or breakers. If it has a breaker, turn it off and on like the other. If it doesn't, behind a plastic panel you will have 2- fuses. Turn off power at main box breaker, and remove both fuses. They are cheap, so go get 2 at a hardware store and replace them. You can have them ohmed out to see if one was bad. After installing the new ones and you turn it on, and all is good, that was your problem. May sure you have power to this outside unit. If it was a blown fuse or tripped breaker and this continues to happen, you may have a internal compressor or condenser fan motor problem. Try the things I have said first. This may be the only problem you have. I do this for a living, 33 years and a licensed contractor. Please keep me posted and I will continue to help you if you need me. Let me know after you check everything.
Sincerely,
Shastalaker7 :)

Apr 11, 2010 | Goodman CLJ36AR42 Air Conditioner

1 Answer

Throwing breaker


Throwing the MAIN BREAKER should not happen. Calculate the distance to your main box. Tell me the wire gauge or breaker amperage. Whatever you do, do not get a larger breaker! If its a breaker on this unit Its probably doa with current leak possibly. DO NOT USE fire hazzard IF SHE TRIPS!!! let me know if its your main breaker inthe house. Hopefully you dont have crappy cloth wiring.

Aug 17, 2009 | Dometic Rooftop RV Air Conditioner

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

Breaker tripping on electric furnace.


First, how old is that breaker and are the connections all clean and tight?  A warm breaker is normal.  If it hot or buzzing, that is another story.  If the breaker is more than a few years old, it may pay to invest in a new one.  They do wear.  If you have a connection which has come loose or is corroded, it will trip the breaker, arc at a connection point or even cause a coil to fail.  Dirty connections heat up and actually back off the holding bolts to the point of failure or to tripping the breaker with arcing.  With the breaker off, inspect all connections from the panel to the unit.  You may get some surprises.
If none of this turns up a problem, inspect the actual heater coil, you may find dirt in there which is causing a problem or the unit itself is failing and touching a grounding point.

Dec 22, 2008 | Intertherm P3RA-048K Air Conditioner

3 Answers

ROOF AC UNIT ISSUES


Ice on the coil is caused by 3 things; 1, low freon charge. 2, inadequate air flow across the coil, this can be a filter or dirty coil (I think you addressed these) or the fan isn't blowing enough air over the coil. 3, the unit is running continuously. A heat pump has another cause, that is something defective in the defrost system, like the sensor, reversing valve, control board or relay. If the breaker is tripping its because the compressor is over amping. There can be an obstruction blocking the fan or something like #2. Or the compressor is going out. If the breaker doesn't trip on other settings, like cool, but trips on heat, then I would look at the airflow.

Mar 14, 2008 | Dometic Rooftop RV Air Conditioner

2 Answers

Electrical - Air Conditioning


Ben, you are on the right track. To upgrade the breaker, first look at the main house breaker panel and determine if allowing more current through main breaker will be taxing it too highly (will 20 more amps exceed my main breaker limit...what is the main breaker current trip at?) Then look at the wire size leading away from the 40 amp breaker to outside. If it is 6 gage copper or 4 gage copper-clad aluminum wire, you are ok to upgrade. Any smaller wire size could be unhealthy.

Sep 03, 2007 | Heating & Cooling

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