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  1. #1
    Join Date
    Jun 2005
    Posts
    1
    Post Likes
    Outside Unit, the control power (thermostat wires)(24vac)are intermittantly dropping out for a second than back on (Goes from 24 to zero than back to 24 volts).

    When it kicks back on just the fan is blowing for a few minutes than the compressor builds up & starts running. Recently had burned fan motor wires @ the harness between the capacitor and contactor. Repaired those (they were burnt individually not together) and the fan works fine. Had a pro check the capacitor & also fan speed is OK. The drop out occurs about every 30 minutes & the pro said if it does not stay off there is no way to determine the cause. The system is a dual zone split w/ 2 thermostats.

    I'm at a loss it can't be good for the system or utiltiy bills for this to continue. Any guidance would be greatly appreciated.

    Thank You, Jonathan

  2. #2
    Join Date
    May 2003
    Location
    Dixie
    Posts
    1,344
    Post Likes
    sounds like you have a loose connection or bad thermostat wire or thermostat...that is not doing the compressor any good

  3. #3
    Join Date
    Jul 2001
    Posts
    3,112
    Post Likes
    Could be the cooling anticipator. No fix, just replce the thermostat. Of course, it could be any number of other things as well.

  4. #4
    Join Date
    Dec 2004
    Posts
    91
    Post Likes
    weak coil on contactor? or enternal overload

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    69,604
    Post Likes
    Does your zone system use a discharge air sensor.
    Does your duct system have a bypass.

    The discharge sensor may be doing its job and shuting down your condenser.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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