There is typically a power switch on the side of the furnace. Second, check
the fusebox. Sometimes, the power to the furnace is a separate box, not in
the same panel as the rest of the breakers.
You might also have an on/ off switch on the thermostat.
Probably needs cleaning. How about call for the $69 clean and check?
Good luck, and let us know how things work out.
Christopher A. Young
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