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Bob F Bob F is offline
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Default Furnace Blower Won't Shut Off


wrote in message
...
All of a sudden my furnace blower runs constantly even though it is
set on "auto" at the thermostat. The heat cycles on and off properly
(fortunately because it is 19 degrees outside). The furnace is about
10 years old and is gas. I seem to recall there is a wiring option on
the motor for it to run constantly but no one has messed with that
since it was installed. I would appreciate any ideas on what the
problem might be.


It could have a relay with a slightly welded contact. Tapping on the furnace or
the relay itself could jar it loose.