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    Dennis B's Avatar
    Dennis B Posts: 1, Reputation: 1
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    #1

    Oct 27, 2014, 10:54 AM
    Intertherm heater 2 blinks
    Intertherm furnace is not working. The control module status indicator light on M1M Series is blinking 2 times indicating: Pressure switch is open!! What is the best way to fix this problem
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #2

    Oct 27, 2014, 12:53 PM
    The "pressure switch is open" status is quite common. Usually the pressure switch is just doing it's job. Is the combustion blower running? Make sure there are no blockages in the vent pipes.
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