Gas Furnaces Re: L4064B Fan & Limit Switch The L4064B controls the on and off operation of the heating unit’s fan motor and provides high limit control of the main burner. It is suitable for all types of forced air heating systems. The L4064B’s bimetal sensing element turns fan on and...

Amana Gas Furnace Re: Lockout Customer reports that the furnace sometimes stops working. They can get it to work again by turning the thermostat or power off and back on. To determine the cause of a "lockout", it is important to know which control is installed on the furnace. Small...