Blower motor won't shut off on furnace

Old 04-03-09, 08:32 AM
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Blower motor won't shut off on furnace

Blower motor decided not to shut off during furnace operation-keeps running even after temp set point reached. Thermostat is a digital Hunter, fairly new, been working fine for a few seasons. Would not shut off when set to off at thermostat. Had to turn off at breaker box. Found a pack rat working/building on top of furnace/duct work. Could he have chewed control wires to thermostat causing this problem? How can I test various possible causes?
Old 04-03-09, 05:15 PM
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Do you happen to know if you have either a non-adjustable fan switch (such as a thermodisc) that turns on and off at a predetermined temp setting? Or do you have an adjustable fan-limit switch? Or do you have a fan timer?

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