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    janman69's Avatar
    janman69 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jul 12, 2008, 07:51 PM
    Blower works.but not with A/C
    Hi there, my a/c worked fine until a few days ago but now here is my problem... the blower on my furnace (5yr old Keeprite) works fine when the thermostat is set to 'ON' but when I turn it to 'AUTO' it shuts down. My a/c works but the blower will not come on when it starts up. Any ideas?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #2

    Jul 12, 2008, 08:35 PM
    Possible bad tstat
    Possible broken tstat wire somewhere

    Have you got a meter to check voltage on wires?

    Till you figure it out ,you can run it,, fan on and air on should cool but the indoor fan just won`t stop running, which is how some people like to do it anyway
    janman69's Avatar
    janman69 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jul 13, 2008, 10:49 AM
    I replaced the tstat. Same problem. Any time the air goes on the blower shuts down so I can't use my air at all or the lines freeze up. I tested the voltage and when the blower is on everything seems fine and same with the a/c wires. The problem is when the air is on there is no power going to the blower at all.

    The furnace runs off a circuit board and the blower is 4 speed.

    Is it possible it is a faulty circuit board?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jul 13, 2008, 11:35 AM
    If the fan relay is located on the circuit board then you probably need a new board.
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