Hi, I have a Carrier furnace and every once in a while you hear the fan start as it usually does as it is preparing to light and then the fan suddenly quits and it flashes a code 12. This is a "blower on after startup" message. I have read a bit about this situation before on this forum but really don't understand what to do about it. Is this something to worry about? What causes it? What course of action should I take? Thanks for any help.
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