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 …

Jun 3, 2025 · Air in the plenum isn’t hot enough yet and must be heated, so the limit switch keeps the blower fan off. This optimizes indoor comfort.

Dec 7, 2025 · This guide explains types of fan control switches, how they work with thermostats and limit controls, troubleshooting steps, wiring basics, replacement options, costs, and tips for optimizing …

Aug 19, 2025 · Are you wondering what a furnace limit switch is and why it's important? A furnace limit switch is a safety device that monitors the temperature within your furnace and turns off the unit if it …

Learn how a furnace limit switch works and how you can tell if yours has an issue. Then find out the best replacement parts to order by cost.

Aug 23, 2025 · A properly set furnace fan limit switch is vital for safe and efficient heating in American homes. This guide explains what the furnace fan limit switch is, how its settings affect the operation, …

Learn how to safely replace a furnace fan limit control with a step by step guide covering power shutoff, wiring identification, part matching, terminal torque, and system testing to prevent...

Sep 13, 2025 · Proper furnace fan limit switch settings improve comfort, efficiency, and equipment life. This article explains how the switch works, common settings, adjustment steps, troubleshooting tips, …

Jun 21, 2023 · What is a Fan Limit Switch? A furnace has two switches, a fan limit switch and a high limit switch; these switches can be separate or in one package called a combination switch. A high limit …

Jan 3, 2025 · This guide will walk you through the steps to test and replace a furnace limit switch effectively. Before diving into the testing and replacement process, it’s essential to understand what …