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-   -   GMS8 blows fuses when on A/C (https://www.askmehelpdesk.com/showthread.php?t=348853)

  • May 2, 2009, 02:34 PM
    ramond
    GMS8 blows fuses when on A/C
    I've got a Goodman GMS8 A/C and furnace and the problem started a few days ago where:

    - the thermostat has no temp reading
    - no response when the thermostat is cycled from off to cool or warm (with either set to auto or on)
    - no response when I reset power on the circuit breaker
    - checked on the LED status light and it's off inside the unit
    - checked the controller board and the fuse was blown
    - replaced the 3A fuse and it blew again
    - replaced the fuse again and I had the thermostat set to OFF (temp) and ON (fan) before I powered it on from the door switch
    - the blower comes to life then I asked my helper to switch it from OFF to COOL and it blew the fuse
    - checked for any loose or possible short on wires, nothing too apparent. I plan to double check it again today

    Any other ideas on what I can do?

    Thanks in advance.
  • May 2, 2009, 03:57 PM
    Joshdta

    Your contactor outside in the ac is probably bad. Take the t-stat wires loose from the outdoor unit then try it again see if the fuse blowes
  • May 2, 2009, 09:04 PM
    T-Top
    Check for low voltage shorts on the thermostat wire from the thermostat to the furnace and to the A/C and check for shorts on the low voltage side at the A/C(low and high pressure switch, time delays).
  • May 4, 2009, 02:16 PM
    ramond
    Quote:

    Originally Posted by Joshdta View Post
    Your contactor outside in the ac is probally bad. Take the t-stat wires loose from the outdoor unit then try it again see if the fuse blowes

    Thanks for the response. I just want to understand this. If I remove the t-stat wires from the outside unit and the fuse does not blow, it's the contactor that's the issue. If the fuse blows while the t-stat wires are disconnected, then it would be a short on the t-stat line? Right?
  • May 4, 2009, 03:43 PM
    Joshdta

    Correct, odds are the contactor is your problem, inless you hit the t-stat wire while weed eating. Contactors run about $25 and are easy to replace.
  • May 4, 2009, 03:46 PM
    mygirlsdad77

    Please let us know what you find.
  • May 12, 2009, 05:32 PM
    ramond
    Quote:

    Originally Posted by Joshdta View Post
    Correct, odds are the contactor is your problem, inless you hit the t-stat wire while weed eating. Contactors run about $25 and are easy to replace.

    After so many rainy days, I finally got out and checked the t-stat lines. The fuse doesn't blow when they're not connected. So I ordered a replacement contactor and replaced it today. I've got A/C back!! Thanks for all the help.

    :D:D:D:D
  • May 12, 2009, 06:09 PM
    Joshdta

    Great, glad you got it going!! Job well done.

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