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Fan circuit board on a/c is blowing

I have a carrier a/c unit and my fan circuit board fuse keeps blowing when power is turned on

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You have a short somewhere in your system. It could be anything from a thermostat, thermostat wire or any component in your system. Honestly, you are better off calling a tech.

Posted on Feb 23, 2008

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Goodman a/c @ heating unit. Model #gmh80703anca when I turn the unit on it keeps blowing the fuse on the circuit panel. What could be causing this?


Several questions:
1. What fuse? 110V at the furnace? Breaker at the house? Fuse on the controller board?
2. Does the ignitor work? Do you get gas ignition?
3. Does the exhaust fan come on?
4. Does the main blower come on?

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I have a Carrier Weathermaker SX HVAC unit with a Honeywell thermostat. Even if the thermostat is turned "off", my fan keeps blowing!


Hello, usually this is a sign of a bad blower relay on the intergrated control board. The only option is to replace the control board.

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I have Carrier 38TKB036 3 ton A/C condensing unit and one 28CCA036 3 ton A-coil to provide A/C to home thru existing furnice. A/C was on and stopped working. Turned off/on, but will not come on. Any...


Is the furnace fan (indoor fan ) running. If not the problem is with the inside unit. It supplies the control power to operate the entire system and has a control fuse on the circuit board. If it is running but not the outside unit then the problem is outside.

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My carrier furnace keeps blowing 3amp fuse when I turn thermostat to cool.


Hello, sounds like there is a short in the low voltage circuit. First inspect the wiring at the control board and make sure nothing is loose or touching metal. Also, inspect the wiring all the way to the outside unit and make sure it is not loose or touching metal on the outside unit. If you dont see anywires loose then you will need a meter to check the wires for continuity to the common terminal on the board with furnace and ac turned off.

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Hi All, I have a carrier reverse cycle airconditioning unit and about a week ago the digital thermostat blanked out. I spoke to an aircon repair tech and he suggested that the fuse is blown at the air...


It will be inside the unit main panel. Turn main power off and remove the main front panel. The fuse will be located on or near the fan control board. Typically they are a flat agc type fuse. 3-5 amps. The problem will be that if the fuse is blown -there is a reason for it. They don;t just wear out and blow. Look for frayed wires around the outside unit and in the thermostat to make sure you dont have a short. Otherwise, you will just blow the fuse you replace.

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1 Answer

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If nothing is happening could be thermostat control wires cut? try using a jumper wire @ the furnace their will be a board with the letters R G W Y B try to jumper R to G the fan should come on. if not its in the controls of the furnace if fan comes on replace the thermostat. don't short the wires you will blow that small fuse. T

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One unit runs a while, powers down, other unit blows transformer


you say it keeps blowing the transformer? you mean circuit breaker? if it is the circuit breaker, have the wiring checked for a short, if no short do a ohm test on the compressor. it may have shorted out internaly.

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I have a Carrier 38tra048340 ac 4 ton unit outside, heater in attic. Thermostat is Totaline P374-1100. Power went out than back on after a few hours due to vehicle crashing into power pole. AC was running...


Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Jun 23, 2008 | Carrier Air Conditioners

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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

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2 Answers

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Sounds like you either blew a transformer, have a bad circuit breaker or blew the main fuse in the outside disconnect. If the indoor unit is still blowing air (no matter what temperature) start looking at the power supply to the outdoor unit. From the circuit breaker, the power will go to a small box located within a few feet from the outside unit. This box will have either a lever on the side or you will be able to open the box and pull out the fuses. From this box the power goes to the condensor. The first thing you should do is to turn off the breaker to the outside unit. Flip it back on and if you have a call for cooling, after about 3 minutes the outdoor unit should start. If it does not, shut off power again to the unit by switching off the breaker, go outside and pull out the fuses in the disconnect box. Using a multi meter, check for continuity thru the fuses. If you have continuity, call your technician. If one or both fuses show no sign of continuity, replace the fuse(s). Make sure that the thermostat is working and sending a signal to the indoor air handler. You may be able to check this by turning the fan switch to "Fan" and see if the blower turns on. You may just have a bad thermostst. Caution should be used anytime you are near electrical components. If you do not have the skill-set required to test electrical equipment, leave it to a proffessional.

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