How To Turn On Furnace Blower. First, remove the wire on the 'g' terminal of the controller in the furnace. In case the furnace turns off when the thermostat is turned to off, a probable reason is a thermostat that is not working properly.
If the problem is a buildup of dust, the fan blades, cage, and blower unit is. At thermostat won't turn off. Furnaces use blowers to move heated air throughout household ductwork.
The button should be similar to a light switch.
If you don't know where to find the limit control switch on. At the furnace or air conditioner air handler or blower unit: If they trip off again then this is a sign that there is a problem with the wiring of your system and you will need to call out your local hvac. Turn the thermostat down, shut off the furnace from the switch on/close to the furnace.