American standard 80 4 red lashes
Filter needed to be changed but it still blows cold air HELP
If the filter was really dirty and now has been removed....
You need to turn the power off to the furnace for a couple of minutes for the board to reset.
Hopefully that will do it.
If the fan turns back on and only blows cold air when the power is restored, then a safety limit switch is probably open.
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