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Furnace lights up then shuts off then 1-3 min kicks back on

Lights then shuts off sounds like relay in the board clicks when it shuts off

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  • LBBP Feb 25, 2008

    Furnace clicks, goes on, pauses, click, click, goes on, pauses, click click.

    Kerosene furnace - tank outside (not that cold so not a frozen line or anything) - Just cleaned filter - Miller furnace - small -- originally for mobile home I believe. Age????? Serviced 9 months ago.

  • brian c
    brian c May 11, 2010

    Can you be more specific with make / model?

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  • 288 Answers

The clicking noise is the heat fan relay. The limit control switch or the high temp thermal disc is what usually causes this. I am with the other guy as I need a little more info. The limit switch has a flat panel with 2 wires on it and held on by 2 screws. It goes inside the heat chamber and has a long probe on the back, usually 3 to 4 inches long. The thermal disc is just that, a disc about the size of a nickel, with 2 wires attached, and is usually not far from the limit control. If you can find these parts, by-pass them by removing the 2 wires on them and connecting them to each other. If this solves the problem, that's it. A faulty thermostat may do the same thing. Go to the thermostat and connect the red to the white wire, problem stops, change the thermostat.

Posted on Jan 12, 2008

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