AC blower does not work in AUTO position

Discussion in 'HVAC Heating & Cooling' started by pmhabo, Jul 18, 2011.

  1. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
    My AC blower won't kick on when in the AUTO fan position. Works fine when I switch to the "ON" position.

    What might this be? How can I fix it?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,949
    Location:
    New England
    Brand and model of thermostat and the rest of the HVAC equipment may help.
  3. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
  4. DonL

    DonL Banned

    Messages:
    4,008
    Location:
    Houston, TX
    Welcome to Terry's Forums pmhabo,

    How many wire conductors do you have connected to the thermostat ?

    Did you check/set the jumper and the switch settings for your type of unit ?


    What model of heat pump/AC system are you operating ?


    Have a good day.


    DonL
  5. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
  6. DonL

    DonL Banned

    Messages:
    4,008
    Location:
    Houston, TX

    Has it always been that way ? Sense you installed the T-Stat ?

    It sounds like a simple wiring problem. The make and Model of the Heat Pump would help you get the correct answer.


    Enjoy your day.


    DonL
  7. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
    Airhandler model is Goodman A24-10
    Heat Pump is Goodman CPE18-1AB

    old tstat was having problems kicking on, but it would kick on by itself when set on auto sometimes. new tstat doesn't ever kick on when set on auto
    Last edited: Jul 18, 2011
  8. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
    Old tstat had:
    Y-yellow wire
    G-green wire
    R-red wire
    O-orange wire
    W2-white wire
    E-tan wire
    C-blue wire
    002.jpg
    new tstat hook ups (tan wire taped up and not used):
    001.jpg
    Last edited: Jul 18, 2011
  9. Runs with bison

    Runs with bison Member

    Messages:
    892
    Location:
    Midwest
    When you say it was having problems, was it making the call but the AC compressor was not kicking on sometimes? When it does this do you hear it trying to kick on every few seconds for awhile (clicking sound?) From what I understand that typically is a bad capacitor or a larger capacitor is required--and in the latter case it can mean your compressor is about shot. I had that problem on my old unit which was maxed out on starting capacitor size, it finally burned off a terminal last summer and my AC guy put a new terminal block in. I can't remember if the AC condenser fan was running or not. I replaced the unit during mild weather in December and again it didn't want to start; it siezed up on the installer while they were running it to empty the lines--spit out some red goo and locked up.

    Relays or contactors also do wierd stuff like this at times. I've had to get them replaced on old units when I was in rentals.

    Old batteries in tstats have also caused some squirreliness, but that's an easy check.
  10. pmhabo

    pmhabo New Member

    Messages:
    6
    Location:
    Ohio
    Wiggled green wire where it connects in the air handler, and "auto" fan mode seems to be working now. I read somewhere the blower had a 4 min count down before turning on again. Maybe I was just impatient before when I was testing it?

    If I have problems still, I will return.
  11. DonL

    DonL Banned

    Messages:
    4,008
    Location:
    Houston, TX

    The built in delay, is so the compressor don't try to restart when the head pressure is high, and protects the compressor.

    Have a Great day.

    DonL
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