Results 1 to 7 of 7
  1. #1
    HVAC guy still here and cannot get the air handler on zone system to shut off even when new board and the thermostats are disconnected. Any idea?

  2. #2
    Join Date
    Jul 2000
    Location
    Columbia, SC. USA
    Posts
    1,143
    Blower relay or blower board bad...? Is someone looking over my shoulder?!?!

  3. #3
    Join Date
    Apr 2005
    Location
    Richmond, Virginia
    Posts
    365
    Give the guy a break. It's a short between R and G.

    Disconnect R and G from unit and ohm out until you find short.
    Sean Cantrell

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,793
    If he disconnects the green wire from the G terminal, and the fan still runs.

    Then if its a heat pump, check to see if the limit is open.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    Jun 2003
    Location
    Hell Hole Swamp
    Posts
    4,180
    Find a tech who knows how to troubleshoot a simple low voltage problem, or possibly a stuck contact on a relay

  6. #6
    Turns out there was a small black U shaped wire laying at the botton below the interior board in the unit. Some kind of relay that had fell out. He put both ends of that in and everything works works!

  7. #7
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,517
    if it is electric airhandler wigth heaters i think the sequencer is stuck and not turning fan off

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