Furnace Fan And Limit Switch

The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home.

Furnace fan and limit switch.

It works off of temperature and also provides a high temperature safety limit this is a switch actually two switches which turns the furnace blower on and off based on the temperature of the heat exchanger. How to diagnose and repair the furnace fan limit switch. A step by step photo guide to testing combination fan limit switches on warm air furnace heating systems check this fan limit switch control if your furnace fan won t start won t turn on or won t stop runs continuously honeywell combination furnace control type l4064 explained in detail guide to troubleshooting heating system 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.

Once the fan limit switch has sensed that the air in the plenum is a suitable temperature usually around 20 degrees above the room temperature it engages the blower fan to distribute air. When the room temperature reaches the thermostat setting the furnace. A helical bi metal probe extends from the back of the. Honeywell l4064b2236 combination fan and limit furnace control.

It s possible to reset the switch at home when necessary by following a few simple steps. More buying choices 94 99 2 used new offers nordyne 626494r fan limit switch. Free shipping by amazon. 4 5 out of 5 stars 164.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. Thermostat limit manual reset switch opens f 350 f 120 to 240 voltage range. 1 16 of 342 results for furnace fan limit switch honeywell l4064b2236 combination fan and limit furnace control. Furnace blower fan limit safety switch installation troubleshooting.

This article describes in detail the purpose operation setting installation wiring and testing of furnace combination controls also commonly called the fan limit switch on warm air heating systems. Get it as soon as fri sep 25. More buying choices 88 00 16 new offers honeywell l4064b2210 fan and limit controller. The fan limit switch tells the blower assembly when it is ok to blow the heated air.

A limit switch is a device that s located under your furnace s supply plenum. Goodman oem furnace 11 replacement combination fan limit switch. It reads the temperature of the plenum and waits until it gets appropriately warm. Free shipping by amazon.

Get it as soon as wed sep 30.