Quote:
Originally Posted by 16ACE27
Which on/off switch are you talking about?
The one on the furnace?
Or the one on the thermostat?
The furnace control board may have gotten wet and energized the fan relay which stuck until you removed power by turning the furnace reset switch to OFF.
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99.9% sure this is what happened, it'll happen again and might not clear when you use the on/off switch.
Time to get some contact cleaner available at any autosupply, Walmart or Amazon.
The little circuit board is
easy to get out and clean.
Use the on/off switch, unplug the wire plug and turn it over, you'll probably see what looks like rust. Use the contact cleaner on both sides
and the cable and connector on the board. It'll be dry by the time you get it reinstalled, don't forget the cable and switch.
Good luck
Here's a link for a replacement board.
https://www.dinosaurelectronics.com/
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