Please help! Sometimes, with thermostat set to heat, inducer motor starts up, igniter turns on and burners fire up normally, blower starts up and furnace runs for quite a while blowing warm air, cycling, and raising the home temperature a few degrees. Everything seems to be fine.
Then suddenly, the blower starts blowing cold air. When the thermostat is turned off, it takes up to a half hour for the blower to stop blowing, or it continues to blow without stopping until main switch in breaker box is turned off. When main switch and thermostat are turned back on after a few minutes, there may be warm air or cold air, it is unpredictable.
At other times, with thermostat set to heat, inducer motor starts up, and blower comes on blowing cold air without igniter or burners starting up. At this time, the LED flashes continuously. Cold air continues to blow until main switch in breaker box is turned off. Cycles, but blowing cold air.
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