Furnace Fan Limit Switch Reset

How to diagnose and repair the furnace fan limit switch.

Furnace fan limit switch reset. It s possible to reset the switch at home when necessary by following a few simple steps. If the air temperature indicates a fire the fan is shut down. Honeywell l4064b2236 combination fan and limit furnace control. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high.

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. Protech 47 25349 02 auto reset limit switch. L4029e reset limit control opens a line or low voltage circuit if the air temperature reaches a critical level. 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.

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. How to perform a furnace limit switch reset. Bryant oem furnace limit switch l225 50 by oem replm. L4029e acts as a fire thermostat in the ducts of ac ventilating systems.

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. The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow. The furnace s lower limit switch is programmed for automatic reset but the upper limit switch must be manually reset. 4 9 out of 5 stars 19.

Step 1 open the cover of your circuit breaker box. Get it as soon as sat sep 26. Identify the circuit breaker switch that controls the electricity to your coleman furnace. Performing a manual reset on a coleman upper limit switch is a quick and simple process.

This is the limit switch on our carrier furnace that i had to reset and reset until it finally stopped needing to be reset anymore and the furnace works fine. The instructions differ depending on whether you have a combination switch or separate high and fan control limit switches as well as on the specific model you have. The limit switch is a safety switch that monitors t. Only 9 left in stock order soon.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual.