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    arby808's Avatar
    arby808 Posts: 110, Reputation: 4
    Junior Member

    Mar 30, 2019, 10:50 AM
    Carrier furnace lock out
    Hi I have a carrier weather maker sxI furnace that has a code 21 and locks the furnace. When the house gets cold I check the thermostat and see it is calling for heat the stat is new. I go to the furnace and shut the power off and the furnace will start running, some times it will work for a hour and sometimes it will work for days or even weeks what would cause this
    talaniman's Avatar
    talaniman Posts: 54,290, Reputation: 10853

    Mar 30, 2019, 01:29 PM
    It could be anything from a control to the gas valve or stuck gas valve.


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