So randomly without warning, my furnace will suddenly start blowing out cold air. If I flip the breaker to the furnace off for a while, and back on, that usually fixes it. It does this about once every month. I have no idea why I've never noticed this before but I saw a red blinking light that flashes 11 times, pauses, and repeats. We JUST had our furnace worked on last year and had a new exhaust/vent pipe put in because it was getting rusty. Any idea what the issue could be? Blower motor kicks on but it just blows cold air, none of the internal wiring is corroded, any ideas before I call in an HVAC tech?
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