blower runs continually


The blower on my OLD forced air natural gas house heater will keep running. Oddly, if I just gently tap the sheet metal housing next to the blower, it stops running? Is the fan limit switch getting stuck?
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snipped-for-privacy@yahoo.com wrote:

Sounds like it ... or maybe it's right at the borderline of shutting off. Try adjusting it a small amount and see if that helps. It might.
Pop`
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snipped-for-privacy@yahoo.com wrote:

Actually there are typically two switches in that assembly. The limit switch to turn off the burner if temps go past set-point, the fan switch to control fan relative to furnace temp. Some have two adjustments- obviously you want the one that's got markings in a reasonable range for discharge temp. If they're still visible.
J
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