Furnace Fan Limit Switch Replacement

This video will help you to diagnose and replace a faulty limit control on your gas furnace.

Furnace fan limit switch replacement.

High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. Tell the fan when to come on. Temperature setting 1 this helps to avoid cold air drafts. The most common reasons for replacing the switch are.

When the desired temperature in the home is reached the furnace burner shuts off but the blower fan continues to operate until the temperature of the plenum falls to the lower limit switch setting. A furnace s limit switch or fan limit switch has 3 main functions. Only 4 left in stock order soon. Honeywell limit controller l4064b2236 u l4064 30.

This video provides step by step instructions for replacing the safety limit switch on lennox furnaces. The limit switch is a safety switch that monitors t. You can change a limit switch with a few tools a manual for your model of furnace and basic electrical know how. 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.

5 0 out of 5 stars 6. L4064b2210 honeywell oem furnace 11 replacement combination fan limit switch. L4064a1339 honeywell oem furnace 5 replacement combination fan limit switch renewed 5 0 out of 5 stars 1. In this episode of repair and replace vance shows how to replace the high limit switch in a gas furnace.

When the furnace is warm enough upon start up to begin heating the home about 20 degrees above room temperature it will tell the fan to come on. Other options new from 109 91. What does the limit switch in a furnace do. Other options new from 112 59.