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Breaker on transformer trips periodically

Carrier heat pump transformer tripping resetable breaker integral on the transformer, lose low voltage feed to t-stsat when tripped

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You have a low voltage short in the system. The only way to find where the short is is with a amp probe. Do you have any dogs that like chewing. i have had many cases where the outside unit has chewed up thermostat wires causing this. If you do not have the amp probe you may need to get a service tech to come out and find short

Posted on Feb 16, 2009


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1 Answer

Carrier puron 38txa a/c compressor will not turn on

Make sure there is power at the compressor, but first at the contactor (being supplied to contactor ). Power being supplied to contacter (line voltage) ?
Yes, then close contactor manually and if it works then check for 24 volts at the contactor coil. Find 24 volts, then you need a contactor.
No supply (line voltage), then check breaker
Breaker on, then check run capacitor and if good check high and low pressure protection.High pressure = trips on high head pressure (manual reset) then clean condenser coil.
Low pressure trips on low charge (auto reset on restored charge)

Sep 03, 2013 | Heating & Cooling

2 Answers

Breaker trips after bout 5 minutes

Breakers trip because of heat.
When heat from wire exceeds breaker rating, it trips.
Something is causing heat on the wire, wire is too small for the amp draw, there is short circuit, or breaker is bad.
Replace breaker and/or test wire.

Put amp-meter on wire and read amp draw through wire.
Amps cause heat. That's why high voltage lines from power station are high-volt-low-amp so there is no heat loss with long distance transmission, until transformer at home converts electricity to lower volts and high working amps with enough power to run electrical devices.
Same is true for AC and DC circuits.
If amp reading on wire exceeds rating on breaker for length of time, then breaker will trip.
The fact that the breaker lets current (amps) to flow for a period of time before tripping is because the breaker is probably rated for slow-acting, or it takes a while for amp draw to heat the wire.

Following image shows amp-meter that clips over wire to get amp reading.

Oct 31, 2012 | Electrical Supplies

1 Answer

Resetting a tripped kitchler low voltage transformer

Model number is not known.
I did not know that Kitchler transformers have a circuit breaker.
Usually they have an override switch.
Did you set the timer to override, what does your product manual say?
Is the transformer humming? Kitchler transformer are supposedly non-audible, but there should be some indicating sound. The humming sound indicates the transformer is working.
Does the unit have photoeye? Cover photoeye with black tape.
Test outlet with circuit analyzer.
Check outlet voltage: if you have 120Volt then output is 10% or 12Volts. If you have reduced voltage, then output is still 10% but might be lower than needed to operate bulbs.
Plug timer into different outlet.
Test output terminals with low voltage tester.
Did you have power outage or nearby lightning strike? Transformers are not protected from surge.
Suggest you contact kitchler. website is useless
7711 E Pleasant Valley Rd
PO Box 318010
Cleveland, OH 44131
Kitchler products are probably warranted through the seller.
Kitchler product manuals are almost non-existent.
Scan your product operating manual and parts list into .pdf format and post on web for others to access.

Aug 09, 2012 | Hardware & Accessories

1 Answer

3amp breaker trips ,this is the breaker off transformer that control the 24volt system.

HI :2 Things, there is a short in the control wire (low voltage) from the inside to out side units...OR...the contactor coil is shorted in the outside unit...Inspect the wire for any sign of damage first..or replace the contactor (not to expensive) thats it,good luck & thanks

Jun 10, 2011 | Carrier Heating & Cooling

1 Answer

Hi i have a rheem super quiet 80 attic unit.. the heat is not working.. the unit will not power up and circuit board is not lit

Hello, if the furnace does not work at all the main thing to check is your line supply voltage. low voltage and fuses. Make sure the circuit breaker is not tripped and verify that you are getting 120 volts to the integrated control board at the L1 nd neutral terminal at the board, if not most likely the breaker is tripped, secondly make sure that the fuse on the unit is good, usually it will be on the integrated control board if it is a newer furnace or on the side of the furnace at the switch box if it is a older furnace, make sure the fuse reads 0 ohms with your meter. Lastly check the transformer, check Resistance on both sides of the transformer and you should get resistance, if not replace transformer, let me know if you have any further questions I will be glad to assist you.

Feb 05, 2011 | Heating & Cooling

1 Answer

I have a Carrier AC unit with a heat pump. I noticed that it wasn't cooling and the circuit breaker had tripped. When I reset the breaker and try to start it again, it trips againafter 10 seconds. The...

Check with your contractor to see if their repair is warrantied. If it is not call someone who carries a warranty and satisfaction guarantee on repairs. It is likely that you got a bad capacitor, however, this typically will not trip a breaker. It's possible that other issue(s) caused the capacitor failure.
How old is this unit?

Aug 26, 2010 | Carrier 38CKC060 Air Conditioner

1 Answer


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.

May 24, 2010 | Heating & Cooling

1 Answer

I have a colman evcon split unit, I had a guy replace the thermostat (old electronic, new mercury) and everthing worked fine. One week later out side unit stopped and was frosted over on the outside. I can...

Hi, you do have a dead short in the control side of the system. Good that you bought a transformer with the breaker. Most people don't and will smoke several of them. Anyway, it is a split system. If it was iced up, it must be a heat-pump, not gas fired. The problem will be in either the stat wiring from stat to indoor unit, to outdoor unit, and if a wire is not grounded in the stat wires, one of the 24volt controls have a dead short as the breaker trips instantly. Here is what you will need to do. You will need to do a process of elimination on all of the 24volt controls. I would start at the outdoor unit as you engaged the contactor by finger to check for power. If you see no stat wiring outside touching, the coil on the contactor is 24 volts and may be the shorted control. Coil could be bad. Pull a wire off the coil,there will be 2 wires at the sides. I am sure you know which are the low voltage controls if you can replace a transformer, this is great. You can find this pretty easy. If you pull a wire off one side and reset the unit and the breaker does not trip, then you know the low voltage coil is compromised. If it trips, go to the next low voltage control as the 24 volt coil on the rsv ( reversing valve ) and unplug it. If you have the schematic handy, it will show you all of the componants on the low voltage side/secondary side of unit that you will need to check until the breaker stops tripping. This is the best way to find the culprit!! I have done this for 33 years as a contractor and I am sure you will find this short very soon by doing this. Here is a tip for you also. Sometimes on the transformers that have these tiny resets on them, will wear out pretty fast. What you can do is take a 3 to 5 amp automotive type fuse and on the 24 volt side of the transformer you just cut the red/ hot wire/24v. and crimp a female stak-on to each end of the wire you cut. Then plug each end onto the fuse.Use some electrical tape around it so any bare metal that may be showing will not touch and blow fuse. This is a good way to protect all transformers that have no breaker if you end up with a short. Cheaper to replace a fuse then to keep replacing transformers every time! The fuse will just blow and you can start looking for the short. Now on your unit you can go to the indoor section where the transformer is that you put in. You can eliminate the thermostat and control wiring to the indoor unit and outdoor unit real fast so you know where or which section the short is in. Just kill main power, now where your stat wiring terminates you will disconnect from the control board. Since you have a heat pump you will have more control wires to work with, so either draw a diagram or use the one on your panel to reattach. Remove the wires from the board that take off to the stat first and supply power back to it. If the breaker holds, you will know the short is either the stat wiring from the indoor unit are touching somewhere/grounded or at the stat.You will then know that's where the short is as you have narrowed your search way down. If it trips, you will do the same to the control wires that go to the outdoor unit. If you disconnect it at the board and it holds, you will know it is from the wiring there to the outdoor unit! So, you either have wires grounded from there out or a low voltage control part has burned out. If you remove all of the control/thermostat wires at the board to the indoor and outdoor unit and it still trips, the short will be in the indoor unit which will more then likely be the board itself. Yes sir, this is really a very easy fix for you and I feel you have the ability to do this checks your self. The short has to be on the low voltage side of the transformer as you have proved that! You traced it right back to the transformer secondary low voltage side. So, just take your time and follow my instructions the best you can, and you will find out which part of the system the short is in and then narrow the search down further! I have a hunch the coil is burned/shorted on the contactor :) A place to start by pulling one little wire off the coil. I know this is a long explanation but I wanted you to understand and help you as much as possible on how to tackle this. Sounds difficult but it is not at all. It is either a low volt componant on the outdoor/indoor/ thermostat/ or stat wiring. If none of those, with all low voltage wires removed at board and it still trips, the board is shorted to ground. You can kill power to indoor unit and carefully take the board loose to look at the back side for any hot spots and you will know its the board. I had one totally smoked on a 5 ton package heat pump yesterday in fact!!! I could not see it until I pulled the board/defrost board out far enough to see it, but I knew it was the problem as it would not control the reversing valve, fan control, or run the condenser fan motor. Please drop me a line and let me know how you are doing, please. I would love to know that you were able to find it as I know you will. Best of luck to you.

May 06, 2010 | Heating & Cooling

1 Answer

Carrier a/c tripping circuit breaker

I believe you are tripping the breaker because you are too close to the capacity of the breaker based upon the distance from the panel to the heat pump. If you are electrically skilled you could check this by measuring the distance and then looking at the standard to see. If this makes little sense to you, you may need to have an electrician check for u. Either way, good luck with it.

Feb 04, 2009 | Heating & Cooling

4 Answers

Heat pump trips circuit breaker

I seem to have the same problem. But when I reset the breakers, they won't stay in the on position. They go back to the off position. What gives? It is 95F inside the house.

Jan 18, 2006 | Haier Energy Star ESA3183 Air Conditioner

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