Goodman Manufacturing Goodman Gas Furnace GMV950905DXA, 95, 90K BTU, Upflow, Var.-Speed Logo
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RL Copeman Posted on Dec 16, 2014
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Goodman Model GMV950905DX-an electrical surge burned out the transformer which I replaced, also replaced the circuit board. The variable speed furnace will no longer kick into high speed and it will l

Replaced the transformer, circuit board, and motor assembly

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  • RL Copeman
    RL Copeman Dec 21, 2014

    Really appreciate the response, I've checked the dip switches before and found them to be in the correct position

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Jeff Bryan

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  • Posted on Dec 21, 2014
Jeff Bryan
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If I remember correctly, there are dip switches on that control board that can be set individually. It is possible that it is just a setup issue. The switch positions should be explained in the installation instructions. I know that some Goodman and Amana two stage furnaces can be controlled by a single stage thermostat, but the dip switches have to be set properly. If the switches are set correctly the furnace will run in low stage heat for approximately 5 minutes and if the thermostat hasn't satisfied yet, it will kick in to high stage heat. I hope this points you in the right direction!

Testimonial: "I really appreciate the response, I have checked the position of the dip switches before and found them to be at the setting in the manual. I will check them again. I keep looking at the inductor which looks like a transformer. I have no idea what it does but it seems the power surge I experienced affected transformers more than anything, any thoughts on that? Is there a way to test it?"

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Goodman Furnace that turns on and fires on all 4 chambers but blower fan does not come on then everything stops and starts flashing 4 red lights.
It does sound like a bad blower motor but the power that is supplied to the motor comes from a solid state control board which could be the problem.
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Mar 26, 2019 • Goodman Heating & Cooling
tip

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.
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on Oct 29, 2010 • Heating & Cooling
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I have a goodman gms90703bxa furnace, transformer started smoking and control board has no red light on. I am suspecting a bad control board??
I would suspect bad transformer. The board may not have a light because it is not receiving low voltage from transformer. With a multimeter you can test the transformer. But, since you likely have a short somewhere be sure to install a fuse right after the transformer or you will be burning up another transformer until you figure it out.
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Dec 15, 2018 • Goodman Heating & Cooling
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Dec 13, 2013 • Goodman Manufacturing Goodman AEPF313716...
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Rudd furnace>>>> power surge.
Some circuit boards have a built in transformer and others have the transformer that sits right beside the board depending on the age of the furnace. First, look for a small 3 or 5 amp fuse on the circuit board. Check it, and if its good, and you have a small ohm/volt meter. Check your transformer. You can either ohm it out or just check for voltage. You have a "high" voltage side and a "low voltage" side of the transformer. The "high" voltage side will go to the power (120 volt) that comes into the furnace. This would probably be the side that would burn out during an elec. storm. To ohm the transformer: (This will be your best way to check)

1) shut off power to the furnace
2) pull the two wires loose that go to the "high voltage side"
3) put the leads from your ohm meter to each wire that goes to the transformer, and you should get some kind of reading. If not the "high voltage" side of the transformer is burnt out

You can follow those three steps to the "low voltage side as well, just remember where you take any wires off.

Be sure you have the power turned OFF. Good luck, hope this helps you.
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Apr 18, 2011 • Heating & Cooling
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Variable speed fan changes speed but will not shut off even if unit is set in off and thermostat is removed
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Feb 26, 2011 • Goodman Heating & Cooling
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Hello, The first thing you need to check with a multimeter is if you are getting 24 volts between the R AND C terminal on the intergrated control board. If not than the transformer is blown and needs to replaced or the fuse on the control board has blown and will need to be replaced. When check for 24 volts at the R and C terminal make sure the door switch is pushed in, u can just use electrical tape to temporaily hold the switch in. If you are getting 24 volts at R and C and notthing continues to run than the intergrated control board is most likely the cause and must be replaced.
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Feb 04, 2011 • Goodman GMS90703BXA Heater
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Fan won't come on, either when heater or air-conditioner is turned on.
you have lost all control voltage. that is generated in the furnace. either the transformer has failed or the fuse in the transformer board has blown or the circuit breaker to the furnace has tripped or you have an open circuit to the furnace in the high voltage wiring. grab a volt meter and start with checking high volts at the furnace and back to the panel. if you have volts then start checking to see if transformer is generating low volts. as a side, if this is a furnace be sure the door is on secure and the door safty switch is depressed or guess what! no fan no volts no nothing. if any lights on board are flashing etc then you have power and it becomes a control problem. be sure your low voltage is getting sent to the stat via red and common on the furnace terminal board. good luck
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Goodman gmp075-3 led blinks 5 times
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Goodman Furnace that turns on and fires on all 4 chambers but blower fan does not come on then everything stops and starts flashing 4 red lights.

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