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  1. #27
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    441
    Quote Originally Posted by jeffrey43 View Post
    Contactor pulls in compressor kicks on for a second fan does not come on at all then it all shuts down.
    I wouldn't think the board was the problem if the contactor was pulled in and the fan and compressor were not running. Sounds like the capactor might be going bad.

  2. #28
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,020
    Quote Originally Posted by hands View Post
    I wouldn't think the board was the problem if the contactor was pulled in and the fan and compressor were not running. Sounds like the capactor might be going bad.
    Sounds like he needs to sit down with his boss and go over diagnostic skills.
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  3. #29
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,384
    Hahahaha...This thread just keeps getting better.

    With how the OP described the problem I would never have been able to diagnose it.

    A reversing valve needs a differential pressure to shift. If you can't make this happen it won't shift.

    Glad you figured it out.

    Also, hope it's not low on charge when it's time for cooling.

  4. #30
    Join Date
    Nov 2012
    Location
    Georgia
    Posts
    13
    When you say the compressor starts for a second then shuts down, I am assuming the contactor is not opening and the compressor is going out on thermal. This combined with the info that you are checking the charge in cooling mode and the only value we know is 8 degrees subcooling makes me wonder if the system may not be charged correctly.

    You stated there is no TXV so when you are checking pressures in cooling mode we need to know superheat, however, the more accurate method to check the charge would be to look at the manufacturer winter charging chart which should be with the unit unless the installer didn't leave it there.

    I have seen reversing valves shift with no noise, and, keep in mind refrigerant flow is what causes it to shift, so the unit must be running for the shift to take place.

    If the compressor is out on thermal it may take several hours to cool enough to start

    Good luck

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