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  1. #14
    Join Date
    Dec 2011
    Location
    San Antonio, TX
    Posts
    381
    What's the model number of the unit? Also, what kind of stat, digital or mercury?

  2. #15
    Join Date
    Nov 2012
    Posts
    12
    I dont have it with me. I wrote it down at work and its still there.

  3. #16
    Join Date
    Nov 2012
    Posts
    12
    Name:  20121031_155523.jpg
Views: 226
Size:  47.0 KB
    Digital stat

  4. #17
    Join Date
    Dec 2011
    Location
    San Antonio, TX
    Posts
    381
    Wiring looks ok from the pic, but without a diagram...and you replaced the sequencer, watched it cycle off.

    Ohm the sequencer, check no/nc. Ohm the wires as well. Sounds like something is keeping the signal when it shouldn't. Double check 24v.

  5. #18
    Join Date
    Nov 2012
    Posts
    12
    I will do that. Thanks for your help. I'll let ya know.

  6. #19
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,793
    Next time you go back to that apartment. Set the thermostat to 77 and see how many hours it has to run. Good chance at night time its not able to reach 77, or just takes hours on end to do so.
    Contractor locator map

    How-to-apply-for-Professional

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

  7. #20
    Join Date
    Feb 2008
    Location
    Altmar, New York, United States
    Posts
    5,175
    this may be a stupid question but is it a programable t-stat?

  8. #21
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,520
    That sequencer is heat activated, it has a heater that heats up to turn the unt on and has to cool down to shut off. Is the control box getting to hot after running for hours to get it to 77 that it can't cool down enough to shut off?

  9. #22
    Join Date
    Jul 2012
    Posts
    18
    Quote Originally Posted by snupytcb View Post
    this may be a stupid question but is it a programmable t-stat?
    I was thinking the same thing!

    I had a similar issue once. I just replaced the sequencer with a two pole contractor.

    Sent from my SAMSUNG-SGH-T989 using Tapatalk 2

  10. #23
    Replace the circuit board,I have ran into this before

  11. #24
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,483
    Quote Originally Posted by craigsac View Post
    Replace the circuit board,I have ran into this before
    screw it...just replace the whole unit....geeeeez.

    seems like the sequencer is staying heated, not allowing the heaters to shutoff. i also believe if the sequencer closes it brings on the fan. am i correct?

    this would explain it. try using a 40amp resistive load contactor to replace the sequencer

  12. #25
    Join Date
    Oct 2002
    Posts
    1,394
    Clean the evap coil!
    Because the evap coil is clogged, the electrical compartment is getting very hot and heating the heat sequencer. Since sequencer relies on 24 volt W signal to heat the 24 volt coil to intiate the sequence timer it closes the circuit to the elements, but the compartment heat is heating the 24 coil instead. Now you have a runaway heat situation.

    You will only see this if you put a remote temperature probe inside the contron compartment and reinstall all covers.

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