Question about Goodman GMS90703BXA Heater

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Keeps blowing the fuse.

A/C is not working. Found a 3 Amp.fuse blown on a circuit board inside the blower section. I already went thru bunch of fuses.
Manufacturer: Goodman
Model # GMS90703BXA
It seems like a short circuit, but I don't know where to look. Any suggestions? Thank you.

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  • Anonymous Jun 28, 2008


  • Anonymous Mar 14, 2014

    Door Blower Switch was loose tried to push back in secure and it shorted. The fuse on the board did not blow will the switch prevent communication with the board?


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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.

Posted on Jun 17, 2008

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Most likely it's near where the wires got weed wacked outside. Follow the wires from the indoor unit to the outdoor unit. Look for any damage along the way. Also follow any thermostat wires you can find and inspect them. Sometimes where they enter into both the inside and outside units they frey on the metal casing. I hope you find something. Otherwise, you may have a bad transformer sending the wrong voltage to components.

Posted on Jun 10, 2008

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Basic Furnace or Heating System Troubleshooting

If you are not getting any response from your furnace and your furnace is not working, then the first thing you want to check is that there is power coming in.

If you have 120VAC coming in, then check to see if you have 24VAC coming from the transformer. If you do not have the 24VAC from the low voltage transformer then the transformer has burnt out. Power surges and especially brown outs (low voltage) can cause the transformer to burn out.

If there is 24VAC coming from the transformer secondary then check to see if there is a fuse in the low voltage circuit. Sometimes the fuse on the circuit board and often are an automotive type fuse that plugs into the circuit board. Sometimes the fuse will be an inline fuse that will be in a black round tube type holder. If the fuse is blown do not replace with a higher amperage fuse, you will cause more damage, or blow the transformer.

If the fuse is blown then unhook the t-stat wires and check again. This will tell you if the short that blows the fuse is external to the furnace or internal.

Now if all of that checks out then the next thing would be to check the low voltage safety circuit. Things such as door switches and high limit switches are all possibly included in this circuit, if any of them are open the heating system will not work.

As a last resort, the problem could be in the circuit board. They do go bad and can shut everything down also. Most circuit boards will also flash a LED light to give you a code for what is wrong and why the furnace is not working.
Count the number of flashes and then check the inside of the front cover to see what the code represents.

This will give you a basic progression of things that you can check through. Using an electrical meter is essential to being able to diagnose and troubleshoot the heating system. If you do not have one and/or do not know how to use an electric meter proficiently, then find someone to help you that does know how to use one well to help you.

on Oct 29, 2010 | Heating & Cooling

1 Answer


Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace take off the lower blower door and locate the circuit board turn the power off to the furnace. In the circuit board there should ba a small car like fuse usually 3 or 5 amps check the fuse it is probably blown replace the fuse with the same amperage fuse and then turn the power back on on the furnace and check the operation of the furnace.

Oct 02, 2011 | Goodman GMS90703BXA Heater

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My furnace will buzz but it want come on

Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace take off the lower blower door and locate the circuit board turn the power off to the furnace. In the circuit board there should ba a small car like fuse usually 3 or 5 amps check the fuse it is probably blown replace the fuse with the same amperage fuse and then turn the power back on on the furnace and check the operation of the furnace.

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Furnace blower runs continuously but no heat

sounds like the furnace control (low voltage) circuit is open, or in other words you either have a fuse blown or a limit switch that needs to be reset. Most newer furnaces have a small knife like fuse, usually 3 or 5 amp located directly on the circuit board. Limit switches that have a manual reset are usually located in the fire box just above the burner. There may even be a limit switch located on the blower assembly. If you fuse was blown, you may need to find out what caused the short in the circuit or it will do it again. If the limit switch was tripped, you need to turn the furnace back on and watch the flame to see if there is "roll out". It it continues to trip or blow fuses you need to have the unit serviced.

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Fuse blow each time I turn on air check for

disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).

By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.

You mat have a bad contactor at the outdoor unit.

Jul 16, 2010 | Goodman GMS90703BXA Heater

1 Answer

I service a goodmang GMNT 080 furnance and found the fuse blown

Hi, any time you remove the high limit wires the limit switch will show that it is open which starts the indoor blower motor. Your limit was good. It showed it was open on your code chart because the wires were removed. If you are blowing this 3 to 5 amp board fuse, its showing you have a dead short on the low voltage side of the furnace, not the high voltage such as the fan motor would run on. Make sure that the 18gauge thermostat wires coming in to the board are not skinned or have a bare spot touching metal which will cause this. Look it over good where it is pulled through to the board terminals. If it blows as soon as you put a new one in, yes indeed, dead short, 24 volt side. You may have to buy more fuses to find the problem, but any part or safety switch that is 24 volts need to be disconnected until you find the faulty part. Your board could be shorted. Kill the power to the unit. Draw a diagram of the stat wires so you know where they go back. Take them loose. If the fuse holds, the problem will be in the stat wire from there back to the thermostat, and can be the contactor coil shorted on the out door unit or thermostat. After you remove the wires, remove the 4- screws holding the board in. They are ( board ) hard to look at the back side, but work it around to get a look at the circuitry on the back for burned or blacked areas on the board. If there is, the board is the fault. I have seen this many times before. If it is, you may be able to get one at a appliance parts house. Take all model and serial, and board numbers with you. Just keep in mind it is a 24 volt part, control wiring toughing metal, stat, or the board its self. My bet its the control board. Please keep me updated on what you find, and remember to kill power when looking at the back of the board. If I have been of help to you on this, please be kind when rating me as I know you will. I will be here if you need more help.
A/C, Heating, & Refrigeration Contractor

May 27, 2010 | Goodman GMS90703BXA Heater

1 Answer

Ruud IFC Furnace Blower comes on and stays running, never lites

Check on the circuit board for an automotive type fuse that is probably blown. These fuses blow because of a short in the control wiring. If the fuse is blown a lot of furnaces run the fan all the time as a diagnostic. You will have to find the short or it will just blow again.

Oct 04, 2009 | Heating & Cooling

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Not a good idea. The fuse protects the wiring of the equipment. To high of an amperage fuse will let the wiring get hot. Being only a 15 amp fuse I assume the fuse is located on your furnace, if so your blower is drawing to many amps. Check for dirty air filters and dirty blower fins. If you have an old 60 amp house panel and that's where the fuse is located you might have additional house circuits using that fuse too pulling to many amps causing it to blow.

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3 Answers

3amp fuse keeps burning out


when a fuse blows, its telling you that theres a fault. this could be a loose or broken wire.
or alternatively, the fuse rating is too low. you could check the wires are tight. and also possibly try fitting a 5 amp fuse. check first that the fuse is rated correctly for the appliance. usually 3-5 or 13 Amps.

Mike @ compurepair.

Nov 17, 2008 | Goodman GMS90703BXA Heater

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