Fan only function does not work, other functions work fine, please help

Discussion in 'HVAC Heating & Cooling' started by clocert, May 16, 2014.

  1. clocert

    clocert New Member

    Messages:
    8
    Location:
    Texas
    I have a Amana single split AC 3 ton. For some reason the FAN ONLY function does not work, everything else work fine. I did the following test:
    I removed the T-stat cover. jumped R,G,Y 3 wires, condenser started, furnace blower also started. If I only jump R and G, the blower will not work , condenser will not work either. I remember I jumped R and G before, the blower started right away, but now, the blower does not work anymore. What can cause this problem ? Thanks.
  2. dj2

    dj2 Member

    Messages:
    399
    Location:
    California
    This must be checked and diagnosed by a tech, to eliminate any guessing that can lead to unnecessary and expensive part replacements. Money worth spending right now before summer heat. If you wait one month, you won't be able to find a tech.

    Usually, dead blower could mean: power supply to the blower problem OR transformer problem OR Tstat OR just burnt blower motor.
  3. clocert

    clocert New Member

    Messages:
    8
    Location:
    Texas
    Thanks, I believe I found the problem. Checked control board, the green wire was lose at the terminal. re-attach the wire. everything OK now.
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