Gas Furnace Fan Limit Switch

The switch is one of the easier devices and attachments on a furnace.

Gas furnace fan limit switch.

How a fan limit switch works. It s also known as a fan limit switch or simply a limit switch. 4 5 out of 5 stars 20. 7975 3281 coleman oem furnace replacement fan switch f110.

Honeywell furnace 5 combo fan limit switch l4064b3432 us stove wood coal. Honeywell l4064b2236 combination fan and limit furnace control. Only 11 left in stock order soon. Over time your furnace s limit switch can develop problems.

It also determines if the furnace should be shut down in the case of overheating. The fan limit control switch on a furnace regulates when the blower will come on or shut off. 4 3 out of 5 stars 39. Free shipping by amazon.

Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home. This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on. Some furnaces provide extra safety features by wiring two or three high limit switches in a series that check the temperature in the furnace at different points. What happens if your furnace limit switch stops working properly.

37 new refurbished from 45 00. This safety feature prevents your furnace from overheating. 4 4 out of 5 stars 167. If the temperature inside of the plenum gets too hot it shuts off the gas supply to your burners to prevent your furnace and heat exchanger from overheating.

The fan limit switch also has two other functions. A fan limit switch consists of the following components. 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. Get it as soon as sun oct 4.

The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil. Additionally when the plenum gets too hot the high limit switch will shut off the gas supply to the furnace burners. The switch makes sure the furnace is operating safely and at its desired settings. The oil fired furnace fan limit switch shown in our photo below is in use on an oil fired warm air furnace where we can see about 3 4 of the silver colored dial where the fan limit switch settings are made red arrow.

The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow. A limit switch also acts as a safety device for your furnace. 25 25 product ratings l4064b 2236 honeywell l4064b 2772 l4064 a e fan limit 8 furnace control.