ungen94
Oct 12, 2007, 02:49 PM
What problem could cause a fan to run on the furnace if switched to on, but won't kick on if set to auto
MOWERMAN2468
Oct 12, 2007, 04:21 PM
Will the fan come on on the manual position? If so it is the thermostat that is defective.
acetc
Oct 12, 2007, 04:46 PM
May be thermostat, fan /limit switch, fan relay or motor.