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Luxaire heat keeps blowing 24 volt 5 amp fuse

Have changed wire from outside unit to inside unit. Replaced computer board 2 ro 3 times. Disconneded one heating element and ran the other and it blew the 5 amp fuse. Replaced the fuse and now running the other ehating element. Any suggestions?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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kstfas
  • 75 Answers

SOURCE: 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

Posted on Sep 23, 2007

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vanni7
  • 163 Answers

SOURCE: 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..

Posted on Jan 04, 2009

  • 26 Answers

SOURCE: I have a goodman furnace and ac unit the fan and

Look at the contactor on the condensing unit, remove the low voltage wires to the contactor and turn on the system. If the low voltage fuse doesn't blow, replace the contactor.

Posted on Jul 07, 2009

luker711
  • 91 Answers

SOURCE: I have a Ruud air-conditioner/heat pump and it blows 5 amp fuse.

It sounds like the thermostat wire going to the condenser is ground, It either got pulled loose and is touching the housing or as in most cases the wire got cut or was chewed by an animal. You need to turn electric off to both devices and physically inspect the thermostat wire going from the air handler to the outside unit, also inspect where they connect inside the unit. When you find the break, cut and strip each individual wire and securely wire nut each conducter red to red white to white and so on. There you go all fixed. That's when I give you the bill for $75...except this time you write that check to yourself. Good Luck

Posted on Jul 14, 2009

  • 233 Answers

SOURCE: 3 amp fuse blows on

this sounds like an issue with the control wiring, there could be wires shorted togeher either at the thermostat, or in the wall, you need to isolate the wires at both ends then check for continuity with an ohmmeter there should be none) to verify which wires are shorted

Posted on Jul 19, 2009

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1 Answer

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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.
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Control fuses only blow with a 24 volt problem. Make sure that you replace it with a fuse NO LARGER than 5 amps.You could have a thermostat wire pinched or some wire touching the cabinet inside the unit, but it is a 24 volt problem.

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1 Answer

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Check the 3-5 amp fuse on the control board, if the fuse is bad then there is a short somewhere in the low voltage circuit, usually in the thermostat wires. If the fuse is good check for 24 volts atbthe R and C terminal, if no voltage there then the board is bad and must be replaced.

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I have a Rheem Furnace Model # RGPH-07EAMGR Serial # FD5D307F16000271. The unit keeps blowing the 3 amp fuse on the ciruit board. I verified the amp draw from the blower motor and it is well below the...


Hi, this fuse is for your 24volt controls, which means anything that runs on or is controlled by 24 volts. Check the thermostat wires at the board where they come in, as I have seen them skin the insulation and ground out blowing this fuse. The contactor coil on the outdoor unit is 24 volts and may be shorted. Its a matter of looking at all of the low voltage wires to the indoor and out door unit. If you have a dog, I have seen where they chew the wires causing a short, or from the sun causing the insulation to come off and short.Something is for sure causing a dead short on the control side, It would not be the stat unless you have been into the wiring behind it and maybe the R, red is touching. (9 times out of 10, a low voltage wire is touching metal or another wire, common. If all of the wires look good, you will need to do the process of elimination. Go to the outdoor unit, and the wires coming outside from indoors, if its a gas furnace, you will have 2 wires. Take them loose, and this will take it out of the circuit. Now try another fuse. If it holds, your problem will be in the outdoor unit. It would have to be the contactor coil. It has 2 small wires, one on each side. Pull them off, tape them so they dont touch and wire the 2 wires coming out back up. When you restore power to the outdoor unit, if it holds you will know its the contactor, it has points on it and this is what closes to start the fan and compressor, just 24 volt coil. This is not a high voltage problem, only a low voltage, so checking the amp draw on motors are wasting your time. After you eliminate the outdoor unit, take each wire off of the terminal block at the indoor unit. Write down how they go back!! This eliminates the stat wire and thermostat. If the fuse holds, you problem is in the stat wire touching in the wall, or at the stat. Most contractors will have an extra wire that can be used. You will need to ohm out the wires to see which is touching. Last thing to do, is kill all power, and remove the 4 screws on the board. It will have stand off's on it to keep the back from touching metal. Look at the back to see if it is burned any where on the raceways. If so, you have a shorted board. Please follow all of my steps and you will find this short. It is really very easy, now that you know its the low voltage side blowing the 5 amp plug in fuse. Process of eliminated the parts like the outdoor unit, thermostat by taking off the wires at the indoor unit and so on. You will find it. Please let me know and rate me on my help to you.
Shastalaker7
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1 Answer

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4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
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R or Rh One Side of 24 volt Transformer
W = White Heat

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Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
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4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
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with one transformer for both units
Rc One Side of 24 volt Transformer
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G = Green Blower
Y = Yellow Cool
W = White Heat
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With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
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W = White Heat (inside transformer)
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4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
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2 Answers

Keeps blowing the fuse.


In more rare scenarios the 24v activated fan relay that is soldered to the circuit board can cause this same problem. I agree with Therinnaiguy, If the fuse is blown 90+% of the time there is a short in the 24 volt control system.

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