Question about Carrier 52FE312-3 Air Conditioner

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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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Posted on Jan 02, 2017

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I am replacing the thermostat with the Ecobee3 lite smart thermostat. The thermostat did not power up. My A/C unit is a Carrier model 40AQ030300BB. Might I have popped a fuse or something?


yes you likely blew the fuse. it is likely a blade style/ similar to one in a car, located on a circuit board inside the blower compartment. BE SURE TO TURN POWER OFF AND LOCATE AND REPLACE WITH SAME THING!!

Nov 11, 2017 | Carrier Heating & Cooling

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FAN NOT BLOWING ON INSIDE UNIT, CARRIER FX4CN042T00AAAA LAST TIME IT WAS SOMETHING ON A CONTROL BOAQRD THAT HAD A RED LIGHT ON IT, QUESTION WHERE IS THAT LOCATED?


If your outdoor unit has a control board/circuit board, it will located at the outdoor units electrical panel where the line voltage electrical whip goes into the unit. Should be 2 screws that hold the panel/cover on. Turn off power, remove panel, and board should be visible.

Mar 30, 2017 | Carrier Heating & Cooling

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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?

Apr 15, 2013 | Heating & Cooling

1 Answer

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.

May 09, 2012 | Heating & Cooling

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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.

Aug 08, 2011 | Carrier 38CKC042 Air Conditioner

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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.

Apr 23, 2011 | Heating & Cooling

1 Answer

Carrier Central Air Conditioner


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 Heating & Cooling

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 | Heating & Cooling

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