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    loneposse's Avatar
    loneposse Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 11, 2008, 11:18 AM
    Central ac coils freeze up and then blower motor quits
    I have a problem with my Miller 2 ton central A/C unit,when turned on it will run for a few minutes then the coils etc start icing up fast and the blower motor will quit and get very hot.I have replaced the capacitors,contactor,cleaned coils & tried another blower motor but get the same results,the unit is a late 80's model.. any clues on what might be causing this? Thanks!:confused:
    crystalbivens's Avatar
    crystalbivens Posts: 489, Reputation: 26
    Full Member
    		  
    #2

    Jun 11, 2008, 11:24 AM
    You need to turn the unit off and let it thaw out then call a AC man to put some freon in it.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Jun 11, 2008, 11:27 AM
    It could be a
    Undercharge of refrigerant.
    Plugged air filter
    Blocked return air
    Closed registers

    The blower motor should stay running all the time the A/C outside unit is running.

    The blower motor you replaced the original with could be defective.
    The blower motor could be running in the wrong rotation/direction causing the air not to move.
    Try running the blower motor by itself when the coil is not iced up. You should feel a strong flow of air out of all the registers.
    asopao20022002's Avatar
    asopao20022002 Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Dec 3, 2011, 03:52 PM
    It could be the time delay ralay, replace it and see what happens! I am almost sure that's the problem.
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