Why does my fireplace blower keep running after I turn the fireplace off?
That's normal — up to a point. The same snap-disc that delays the blower at startup keeps it running until the firebox cools below its trip point, usually ten to twenty minutes after you shut the flame off. If it runs for hours or never stops, the snap-disc is probably stuck closed, or the speed control's been left on a manual "on" setting.
It's clearing out the leftover heat
The snap-disc reads the firebox temperature, not whether the flame is lit. After you kill the burner, the heat exchanger is still radiating warmth, so the blower keeps pulling that heat into the room instead of letting it drift up the vent. A ten- to twenty-minute run-down is exactly what should happen — it's squeezing the last of the heat you already paid for out of the unit.
When it won't shut off at all
If the blower simply never rests, a few things cause it. The snap-disc can fail closed — its contacts effectively welded — so it never opens the circuit. Some variable-speed controls have a manual "on" position that someone left engaged, bypassing the disc entirely. And on units with a control board, a stuck relay can hold it running. A blower that runs around the clock wears its bearings out early and starts the squeal that leads to a bigger repair.
The fix, and whether to worry
A stuck snap-disc is an inexpensive part and a quick swap — usually a single visit with the part already on the truck. We'll confirm it's the disc and not the speed controller before we replace anything. Leaving it running isn't dangerous, since the blower never touches the gas system, but it does shorten the motor's life, so it's worth fixing rather than living with. Call (828) 545-0525.
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