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    spleenless9's Avatar
    spleenless9 Posts: 47, Reputation: 4
    Junior Member
    		  
    #1

    May 27, 2009, 07:36 PM
    Heat won't shut off
    I have a forced hot air, oil furnace. When I bought the house, the furnace was shut off. It runs fine when I turn it on, but won't shut off. I think it's the thermostat - a round Honeywell, but I'm not sure how to test or replace it. Any help would be appreciated. Thanks, Pete.
    dac122's Avatar
    dac122 Posts: 463, Reputation: 17
    Full Member
    		  
    #2

    May 28, 2009, 05:09 AM

    Its either your thermostat or depending on its age a sticking relay on your furnace's control board.

    To test the thermostat check for 24VAC voltage across your W and C once there is no call for heat.
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