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  1. #14
    Join Date
    Dec 2004
    Brooklyn, New York
    OK, then it might be time for new board.

  2. #15
    Please keep us posted. I have had the same EXACT issue. Went through it with Trane's light commercial tech support and they couldn't give me an answer. I changed the board as suggested and luck. Tech support had me disable the economizer, options, and ignition modules which he claims could cause a similar issue. My unit was a heat pump, and it acted as if circuit 1 didn't exist. It would completely skip over all of the circuit 1 test functions. Definitely logic related, not safeties or contactors.
    To this day 1 year later, the customer luckily has not complained about it. By the way if it matters this unit is on a Trane stat not sure about yours.

  3. #16
    Join Date
    Feb 2008
    Derry NH
    I had a similar problem and turns out that the board was sending 24v to both sides of the C1 coil. When I would test each side of the coil to ground I would get 24v so it wouldn't pull in obviously. There was an identical unit next to it, swapped boards and it worked out, ordered a new board, installed it and it runs like a top now.
    "You better watch who you're calling a child Lois. Because if I'm a child then you know what that makes you? A pedophile, and I'll be damned if I'm gonna stand here and be lectured by a pervert."

    -Peter Griffin

  4. #17
    Join Date
    Dec 2010
    San Bernardino, CA
    Have you checked the reading of the OAT? Ive had several sensors fail and hold out the first stage. Disconnect the sensor and it reads a default 74. I had a bunch reading -10 outside when it was in the 90's. I have a Trane manual with all the sensor readings in my van. You can email me if needed and tell me what the DCV readings are and I can tell you if its within range.

  5. #18
    Join Date
    Sep 2008
    Western PA

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