What Is A Limit Switch On A Furnace

The fan limit switch also has two other functions.

The primary limit switch is a temperature activated sensor that protects your furnace from overheating whenever the fan fails to blow enough air over the heat exchanger. A fan limit switch is a component of a furnace system that determines when the furnace blower assembly for hot air turns on and off. A furnace has two switches called a fan limit switch and a high limit switch these switches can be separate or in one package called a combination switch. The fan limit switch on a heating furnace controls when the furnace blower fan turns on and off.

It s also known as a fan limit switch or simply a limit switch. This control also provides a safety limit that turns off the burner or furnace if temperatures at the furnace are too high. The fan limit control switch on a furnace regulates when the blower will come on or shut off. Essentially this means that it determines when the hot air should be blown through your ventilation system.

Fan limit switches are used on all types of building heating furnaces. A limit switch also acts as a safety device for your furnace. Once the plenum reaches a specific temperature the limit switch sends a signal to the air handler to begin running and delivering warm air to your home. Limit switches are found on all types of furnaces whether they run on oil gas or electricity.

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A limit switch is a device that s located under your furnace s supply plenum. It reads the temperature of the plenum and waits until it gets appropriately warm. Furnace fan high limit switches are designed to sense the temperature of the furnace and instruct the blower fan to turn on or off at the appropriate times. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high.

In many models it also has a built in safety control for the burner to shut off at higher temperatures if the burner s inner control malfunctions. The vent limit switch which is also referred to as a fan limit switch and is typically shaped like a small metal disc prevents damage to your furnace by shutting the furnace down in the event. The switch makes sure the furnace is operating safely at its desired settings.