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Goodman GMH95 furnace getting code 3.

Not turning on at all. Anyone has suggestions? I have already check for cloggs and all clear. I hear a humming when I turn on the plug switch so power is coming. I even used a drill to test to see if they outlet works and it does. All electrical seems to NOT be loose. Thermostat is working properly and the fuse inside the furnace is still good. Fuse in the main fuse box still good too. Any suggestions before I fork out money. This unit is not even 3 years old.

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  • Kong Vang Jan 13, 2013

    Furnace does blink, throws a code 3. Thermostat seems to work correctly. When setting heat to come on you can hear a click. My thermostat and furnace is less than three years old. Had all of this done when I bought my house new by a contractor. Can\'t call him now as he\'s not in business anymore. 7 degrees this morning what a great timing.

  • Kong Vang Jan 14, 2013

    Also the blower is not on. All I hear is a soft low humming noise. Even when I turn on the thermostat to "fan on" nothing comes on. Youtube usually has answers for me but not on this one.

  • Kong Vang Jan 14, 2013

    help help help lol. Tomorrow after work I am calling a tech. Hope to fix it myself before then. Don't really have the extra cash for throw around but will probably end up doing it unless there's a miracle. Thanks.

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  • 305 Answers

Humming noise from motor means it is seized

Posted on Jan 06, 2014

  • Scott Corey-reid Jan 06, 2014

    or run capacitor is shot

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Accurate Joe
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SOURCE: Goodman GMP075-3 ignition problem

Test while the unit is firing with a meter. you should have 24 volts going to gas valve. If you do and no gas is coming out, you have a bad gas valve. You will need a gas pressure test kit to install a new one correctly.

Posted on Dec 01, 2008

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SOURCE: Goodman GDS8 Furnace Won't Cycle

I had the same issue as zippygaloo with the harness plug. By lifting up the connector, the furnace would go out of it's current fail mode and start operating normal again. I have temporarily resolved my issue, by tying up the wires (looped under them with tie raps) and secured them to the vented furnace housing directly above, thus alleviating any stress pulling down on the connector plug by the weight of the wires. Since doing this my furnace has been running flawlessly and stays right at the temp on the Tstat. No more fault modes with blinking lights! Hope this helps you guys. I don't know if it's related to bad design flaw, or there is a weak connection on the board, but it worked for me.

Posted on Mar 01, 2009

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SOURCE: goodman gmnt100-4b wont ignite

I had the same problem. I had to remove a return air duct filter that i had installed and it worked just fine. The system needs plenty of air flow to operate.

Posted on Jun 17, 2009

  • 29 Answers

SOURCE: Goodman furnace

double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again

Posted on Jun 21, 2009

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