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Fuse burn out

Everytime i turn on the ac the fuse in the circut board blows out. the fan blows fine so does the heat. i checked the wires for a short but it checked ok.

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  • 149 Answers

Thermostat section for cooling could be faulty if its electronic some short is possible on the electronic board

Posted on Apr 23, 2008

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My(38ycc030340)carrier heat Pump ac unit blows 5 amp fuse on board in handler in attic when switch stat to heat.


Miss wired or shorted low voltage wiring. Have you changed stat? Animal chewed wires at foundation wall or in attic?

Oct 10, 2016 | Carrier Air Conditioners

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Coleman furnace dgaa077bdta


The control fuses keep blowing tells me one or more of the control that operate the control on 24 volts is malfuctioning. Most controls operate at about 5 watts and on a clamp on amp meter normally pull about 0.2 amp (p = current x voltage, 5 watts = 0.2 amps x 25 volts) I install 75 watt 24 volt transformer with a resettable overload to save on fuses. I reset the transformer and quickly go to the controls and determine the amp draw. When I find the one >0.2 amps I found the problem. The things to check is the emergency heat sequencer, fan control sequencer, reversing valve for heat pumps, main contactor on the condensing unit and any other 24 volt control loads. I have had to replace the themostat wire because the increase current for the thermostat wire can cause the entire length of wire to form a long heater and cause insulation degradationa and cause the thermostat wire to short out and blow the fuses.
Hope this helps

Aug 30, 2014 | Coleman Mobile Modular Home Gas Furnace...

1 Answer

My york heat and air unit with emergency heat is blowing 30 amp fuses and sparking at the fuses and contactor when turn main breaker back on. I have replaced contactor, transformer and the compacitor on...


You either have something wired wrong or you have a direct short in the system. Are you starting the A/C or the furnace? If it's the A/C, it could be a shorted compressor, capacitor, fan motor or it's wired wrong.

Oct 30, 2013 | Air Conditioners

1 Answer

I have a rudd M#rgps05 eauer when call for heat fuse blows checked for any loose wire,proper ground and found nothing wrong also disconnected r&w coming from t"stat and jumped them but still keeps...


Check short for thermostat, disconnect all thermostat wiring and then try jumping the R&W to see if the fuse holds. If it holds then it is in the wiring or thermostat.

Oct 24, 2011 | Ruud UBHC Air Conditioner

1 Answer

Thermopump went on outside home but the funace in the house wont go on ,no heat its a lincoln .no juice checked the fuses, fine.like no power.10 year old,


Then you must have a low voltage problem. Do you have 110/220v going to transformer and do you have
24 volts coming out. If the answer is yes, try to turn
indoor fan to the on position if it comes on, then it
sounds like you have a connection problem with thermostat or control board.

If fan wont come on, their could be a little fuse located in the circuit board on indoor unit and it could
have blown. If thats the case and it blows when you replace the fuse again. Disconnect the thermostat wires, put new fuse in. If it does not blow then you have a short in your thermostat wires

Jan 22, 2010 | Ruud Central System Air Conditioner

1 Answer

Goodman heat pump the fan runs but blows the 3amp fuse


The 3 amp fuse is for you're control voltage only, which is 24volts,ac. Something in the control side of your unit has a direct short in it. Since I am not on site to help you find out what part is at fault, I will give you some things to check out.You say you're indoor fan runs. I can only assume when you put the thermostat fan to on and not auto. Since this is a heat-pump, and not a gas fired unit, you will have a few less things that are 24volts.You say it blows the fuse on both heat and cool. You or someone that may give you a hand needs to do a process of elimination. What you will need to do, is to check all of the 24v. components to see which is at fault. The 24volts via relays and coils are what controls the motors, compressor, ect. We know that the indoor fan is good. I would be looking at the contacter coil first, even though the thermostat is 24volts. Since the contacter controls the condenser fan motor and compressor, my guess would be the coil on your contactor is shorted. I am not sure if you're heat-pump is a package unit or a split? Either way, you need to open up the control section of the compressor section which on a split its the outdoor unit. On a package unit, its where the main power enters. That would be on what ever kind of Goodman you may have, the 220volts come in and each of the 2 hot wires connect to the bottom of the contactor.What to do 1st.What ever it is, a split or a pack unit, turn off the main power to unit, split, outdoor unit, pack, whole unit.Even if this is a split system, when you turn the power off to the outdoor unit, you will still have 24volts to it when you turn the stat on.The 24 volts comes from the fan center on the indoor unit. With all of the power off, look at the contactor. On each side you will see 2 wires to a copper coil. Pull off these 2 wires, and dont let them touch anything even though they are dead.Turn power back on and check the 3 amp fuse. It should be fine. Now, with the power turned back on, touch these 2 wires back to the coil.This should blow the fuse. If it does, that contactor needs to be replaced.I know this is a lot to check, but I am sure the contactor coil is shorted. You will have to buy one from a retail appliance store. Every wire must be put back in its original place. If you don't think you can test this, I would advise calling someone out. I know this is a long solution, but i am sure that is the problem. Let me know please. Good Luck,
Shastalaker7
Ps an electrical meter would be of a lot of use to you. One more thing, if the copper coil on the contacter is burned and black, just turn off all power and replace it. I am certain this is your fault.

Nov 12, 2009 | Air Conditioners

1 Answer

3 amp fuse blows after three hours on Goodman 4 ton 16 seer pump


I would suspect you have a problem in the defrost circuit of your heat pump. there are a couple of things you can try. first just run the system on emergency heat and see what happens. you could have a defrost board that is shorting when it kicks into defrost. it sends a signal back to the furnace so it will come on during defrost. if you do not blow a fuse as long as you are running in emergency heat, i would suspect the defrost control board. also you could have a dead short in the wire that runs from the "w" terminal on furnace control board, out to the heat pump. keep in mind that any of the wires could be the cause and i am just tying to give you the most common things. your furnace will still run if you unhook all the low voltage wiring out at the heat pump. if you do this and stop blowing fuses. you know it is something on that wiring. goodl luck.

Jan 26, 2009 | Haier Energy Star ESA3183 Air Conditioner

3 Answers

3 amp fuse blows on a carrier 58mcb furnace board


Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Jan 04, 2009 | Carrier 52CQ-312-4 Comfort Series Heat...

1 Answer

FURNACE OR AC WONT TURN ON


to see if it is the t-stat or the system you can unwire the entire t-stat and jump out the wires. never touch the blue to any other wire or you will blow the low voltage fuse on new board. if you jump red to yellow and your condensing unit cycles on the t-stat is wired wrong or wrong style. If not go check the yellow wire at cond. unit and see if power is even going to it.

Sep 24, 2008 | Intertherm Air Conditioners

2 Answers

Air Conditioner malfunction


Hi, Sounds like you have a short in the control circuit to me. Turn off all power going to the unit. Write down or otherwise mark the wires leaving the control board going to the thermostat. Remove them from the control board. Replace the fuse. Turn power back on and see if the fan still runs. If it does, check and or replace the heat limit switch that brings the fan on during the heat cycle. It may just need adjusted. If the fuse blows, I would think that the control board is probably bad. If it doesn't blow, Remove the thermostat. Leaving all thermostat wires open check them with an Ohm meter. There should be no continuity between them. Twist all the wires together at one end and ohm them again at the other end. You should have complete continuity on all wires. If the wiring checks out, down power the unit. Double check your wire colors and rewire the control board. With all wires open at the thermostat, turn the power back on. Touch the RED wire to the YELLOW wire. The Condensing unit should come on. Touch the RED wire to the GREEN wire. The fan should come on. Touch the RED wire to the WHITE wire. The heat should come on. Down power the unit. Replace the thermostat. Test unit. If the fuse has lasted ok but blows now it is either wired wrong at the Thermostat or the thermostat is bad. I hope I have helped. NOTE: If you can not understand these instructions. Call a licensed Heating / Air conditioning company. kstfas

Sep 23, 2007 | Air Conditioners

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