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    bruce_crock's Avatar
    bruce_crock Posts: 1, Reputation: 1
    New Member

    Oct 14, 2006, 10:25 PM
    Day & Night forced air heater keeps blowing cold air
    Yesterday my heater was working as normal.

    Today I replaced the filter in my Day & Night forced air heater. Later I bumped my thermostat when walking by it, but I'm not certain that this caused the problem.

    My heater turned on and blew hot air. I turned it all the way down, but the fan kept blowing hot air (for about an hour). Eventually, I decided to throw a breaker to turn it off, hoping that turning it back on would reset. Unfortunatlely, when I turned it back on, the fan kept blowing cold air, whether I turn it all the way up or all the way down.

    So I replaced the thermostat thinking I might have broken it... but have the same result.

    There is no "fan" switch on my thermostat. I haven't opened up my heater yet to inspect it.

    Any ideas?

    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member

    Oct 14, 2006, 10:31 PM
    Best guess is. When you turned off the power to the furnace while the burners where running. The heat had no where to go and tripped a limit. I can't tell you which one or where. If it is a downflow fornace, it's probably the one in the blower compartment.

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