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

    Mar 4, 2007, 03:26 PM
    Millivolt Thermostat cycling too rapidly
    Hi,
    I have a Honeywell "CT43-A-4440" 750 millivolt thermostat controlling our gas fireplace - but of course I've lost the owner's manual :o (I can't find the manual on the Honeywell site either)

    My problem - the thermostat calls for heat correctly but once the room has reached the target temperature it cycles the fireplace off and on rapidly 10-15 times. By "cycling" I mean it calls for flame, then a second later it shuts it down again.

    There's a small screw inside the thermostat that I suspect is an adjustment but I'm not sure which way to turn it, how far to turn it, etc. (or even if the screw is what I need to adjust).

    Any help would be most appreciated.

    Thanks
    jake4's Avatar
    jake4 Posts: 29, Reputation: 1
    New Member
    		  
    #2

    Mar 5, 2007, 08:23 PM
    I would say if it has been working fine for a while, you don't need to adust it, replace it with a new millivolt thermostat gold contacts are better
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Mar 5, 2007, 09:29 PM
    There is a sticky in the Electrical forum with links to thermostat manuals.
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