![]() ![]() The fan limit switch tells the blower assembly when it is OK to blow the heated air. When the furnace calls for heat, the burners turn on and heat up the air in the air plenum, before it is blown across the heat exchanger and out to various rooms through the ductwork of the home. This allows the blower fan to be set to run continuously. A blower fan Manual ON switch is also included on many fan limit controls.A high limit setting, which turns off the heat source or burner if the furnace overheats to dangerous temperatures.A control which turns the blower fan on or off depending on the air temperature within the furnace.A temperature sensor within the furnace.How a Fan Limit Switch WorksĪ fan limit switch consists of the following components: It also determines if the furnace should be shut down in the case of overheating. Just as it determines when the blower assembly should turn on, it will also determine when it should turn off. The fan limit switch also has two other functions. Essentially, this means that it determines when the hot air should be blown through your ventilation system. (Last Updated On: September 13, 2017) Definition of a Fan Limit SwitchĪ fan limit switch is a component of a furnace system that determines when the furnace blower assembly for hot air turns on and off. ![]()
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