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.- posted
15 years ago