I have a very old furnace, 40-50 years old, at least. The fan won't
stop running even when the thermostat is turned off, or when I turn
off the electric switch to the furnace. The only way I could stop it
running is to turn off the breaker to it. It seems very simple: pilot
light, burners, blower, thermostat, and that's about it. No A/C or
humidifier. I have to fix it myself. Does anyone have any ideas?
Thanks so much for your help. Peggy