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Thread: Goodman Furnace

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  1. #1
    Join Date
    Oct 2008
    Location
    Cleveland, Ohio
    Posts
    27

    Confused Goodman Furnace

    So I have furnace that has finally beat me. Its a Goodman 80% about 5 yr old. The problem came to me after another company had replaced the board and by-passed the on/off switch on the unit. The actual problem is that the furnace will begin running the inducer and shut down as if the power was shutting on and off. I had suspicion right away that the blower door switch was bad cause it was stuck closed and didnt open when I removed the door. I bypassed the switch and the problem still happened. I kept checking voltage to the unit while it was acting up. I never saw a voltage drop. I bypassed the thermostat and the problem kept coming. I also kept checking the transformer to see if it was acting up and never lost the 24v. If anyone can offer a suggestion to this issue it would be greatly appreciated. This problem is intermittent.

  2. #2
    Join Date
    Feb 2012
    Location
    Toronto Canada
    Posts
    1,088
    I would start back at the panel and check the feed etc.
    Why was the power safety switch Removed? I would check thier joint's made in the wire.
    look for loose conections.

    Or is it the preasure switch holding it out whats the code on the board?

  3. #3
    Join Date
    Oct 2008
    Location
    Cleveland, Ohio
    Posts
    27
    The furnace is not coding at all. Its like someone is shutting it on and off. All the lights on the board shut off for a moment and it will continually do this then just stop and run. I bypassed the safety switch temporarily during trouble shooting the switch did not move freely and I thought maybe the contact was shot. I did replace it at the time off the call. I did check the power on the panel, switch and board. I have 118 everywhere and it never drops out.

  4. #4
    Join Date
    Dec 2004
    Location
    Caledonia WI
    Posts
    877
    Check for faulty pressure switch, tubing or nipple on inducer plugged. Sometimes if pressure switch cycles rapidly that will happen.

  5. #5
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    hate to say it may be the board....one tried to beat me yesterday ...same problem..... board fixed it..... also had one a while ago with a bad neutral.... if you have 118 and it never drops then power not the problem..... could be the ventor motor is there line voltage there or do you loose it.
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  6. #6
    Join Date
    May 2009
    Location
    northern kentucky
    Posts
    143
    When checking voltage, use the neutral at the board. Sometimes we don't think and just hook to the cabinet, and find out later that the problem was in the neutral all along. Also I would check outputs on the board, are you loosing power to the motor? I have seen boards come from the factory with bad connections.

  7. #7
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    Quote Originally Posted by local 392 View Post
    When checking voltage, use the neutral at the board. Sometimes we don't think and just hook to the cabinet, and find out later that the problem was in the neutral all along. Also I would check outputs on the board, are you loosing power to the motor? I have seen boards come from the factory with bad connections.
    that is good advise......
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  8. #8
    Join Date
    Nov 2008
    Location
    baltimore
    Posts
    26
    Try jumping out inducer so it runs all the time. Then see if burner goes thru normal cycle. Also try taking inducer off board all together than jumping out pressure switch. Make sure gas is off. You will be able to see if unit goes thru cycle this way as well. This should be able to narrow down the problem.

  9. #9
    Join Date
    Oct 2008
    Location
    Cleveland, Ohio
    Posts
    27
    [

    heres a video of the furnace in action

  10. #10
    Join Date
    Nov 2012
    Location
    East TN
    Posts
    44
    I agree with Carmon. I think you have a faulty board.
    First child on the way and
    "It's safe to say that I'm gonna get my payback if he's/she's anything like me"

  11. #11
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    3,960
    Check the power from +24v going from the board to the thermostat. The relay kicking on and off is odd, the board very well could be the problem.

  12. #12
    Join Date
    May 2011
    Posts
    79
    I had a similarly aged Goodman 80% doing the same thing a while back. The board was dropping out power to the inducer then starting it back up. Same clickety relay too.

    The new board that Johnstone gave me was completely different from the old one. I suspect the redesign of it was no coincidence...
    Last edited by Andr00; 12-28-2012 at 10:46 PM.

  13. #13
    Join Date
    Oct 2008
    Location
    Cleveland, Ohio
    Posts
    27
    Went back this morning and began trouble shooting at ground zero. Found that the pressure was acting up. Started the furnace and the problem began immediately. Let the inducer run for a sec and jumped the pressure switch and it ran fine. I tested it time and time again with and with out the jumper and had the same result 20 out of 20 times. Changed the pressure switch and tube. The board never coded the entire time with the failure. Thanks for the incite. To add Mr. Bill the customer never once purchased any parts, there was another company involved prior who I work for. The unit was out of warranty besides the heat exchanger.

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