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

    Jun 20, 2008, 05:53 AM
    COOLING worked and suddenly stopped
    Air was working fine and set it to 82 leaving. Net day the system didn't work wouldn't run fan or air from the thermostat. Is a m1mb 077a unit. Found that the 3 amp fuse had blow and replaced it the fan ran fine.. placed it in air mode and it blew the fuse again. Help.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 20, 2008, 07:09 AM
    You have a problem with the 24 volt low voltage control circuit. Check the low voltage wires going to the outside unit first. Could be a shorted coil on the contactor also. Post back with results.
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