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The fan limit switch on a heating furnace controls when the furnace blower fan turns on and off. This control also provides a safety limit that turns off the burner or furnace if temperatures at the furnace are too high.
Check this fan limit switch control if your furnace fan won't start (won't turn on) or won't stop (runs continuously). Guide to troubleshooting heating system furnace controls, limit controls, and fan controls.
17 sie 2015 · This video provides step-by-step instructions for replacing the safety limit switch on Lennox furnaces. The most common reasons for replacing the switch are when the furnace overheats or...
27 kwi 2022 · The furnace high limit switch helps to ensure your safety and the comfort of your home. Pretty handy for a part that costs as little as $4. It senses the furnace temperature in the plenum, and tells the blower fan to turn on and off as needed, according to pre-set temperature settings.
A furnace fan limit switch is a crucial component in a heating system that helps regulate the temperature and airflow within the furnace. It acts as a safety device, preventing the furnace from overheating while ensuring efficient heating and distribution of warm air throughout the house.
11 mar 2021 · Follow these steps to replace your broken or worn out furnace limit switch and save yourself from paying other local contractors several hundred dollars. 1. Furnace Deactivation. Turn off your furnace power using the service switch or your circuit breaker.
28 paź 2020 · This article series describes in detail the testing and diagnosis of problems with warm air heating furnace combination controls, also commonly called the "fan limit switch" on warm air heating systems. As a working example we examine the Honeywell combination fan and limit control type L4064B.
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