We have a White-Rodgers 1F80-51. The fan blows continuously... even when on automatic and we turn the temperature above room temp. Any suggestions?
Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.
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