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Goodman GDS8 Furnace Won't Cycle

We have a Goodman GDS8 down flow furnace. It's 3 years old. We get three flashes on thecircuit board when a call for heat comes from the thermostat. Ifollowed the troubleshooting per the instruction manual. I replaced thepressure switch with a brand new one. The induction motor works fineand spins up when a call for heat comes from the thermostat. And I checkedthe flue and it is clear from obstructions, there were none.

There is a group of wires on the left side of the circuit board and ifI grab that group of wires with my fingertips and barely lift it, thecircuit board LED goes solid and 70% of the time the furnace will cyclecorrectly and start and work until it reaches the temperature set on the thermostat, after which it will not cycle the next time. The other 30% of the time it starts the sequencebut then gives the three flashes on the LED again. Also, when I liftthat bunch of wires I can hear a clicking sound and the LED is affected when I hear the clicks.

I can't figure out the problem, let alone fix it. Any suggestions.

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  • mjthe2ofus Feb 06, 2009

    I have a problem with my goodman furnace. for some reason it can be set to 69 and not turn on and go down to like 55 in my home. at other times my furnace will turn on. but when it runs it constantly shuts on and off on and off. and sometimes it will make a clicking noise like a relay is clicking. I have checked everything that i was told to check and nothing. what is wrong with my furnace

  • marcopolo79 Mar 11, 2009

    I think I have the same problem as mjthe2ofus, although I am not sure of the model because I am not at home right now.
    The heat does work however it seems like once it reaches 69 it struggles (although I have seen my temperature over 69 a few times).



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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

  • Melbe Jan 06, 2015

    Yes, before relieving stress on molex connecter with wire ties, check the back of circuit board for hairline cracks on solder joints. This being caused by vibration and stress on the connecter (component side). Don't forget to mark all connections, before disconnecting!

  • Melbe Feb 21, 2015

    Yes the solder connections on the back of the connecter are weak, with little solder to hold and should be re-soldered. Look for cracks in the solder joints.


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Sounds like you are on the right track with the plug. Pull the plug apart and check to make sure all the prongs (male and female are correctly snapped into position ...usually its a conductor prong that has been pushed out of place when the plug was put together. I have also seen this problem and could not find a solution, just changed the board and the problem was resolved ( thought it was perhaps a crack in the printed circuit).
I have also seen problems with the connection for the pressure hose on the induction fan clogging up ...pull the hose off and push a very small wire into the hole (with the furnace off of course) and see if it fixes the problem. The fan I ran into the problem with had the connection located low on the housing.

Posted on Nov 18, 2008


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