You can test a furnace limit switch at home with the right steps and tools. Always turn off the power and gas before you start for your safety. Gather a multimeter and a screwdriver. These tools help you check if the limit switch works properly.

To check limit switch functionality, follow these simple steps. First, visually inspect the switch to make sure it appears in good condition. Next, check limit switch operation by manually moving it. After that, use a multimeter to check limit switch electrical performance.

You can test a high limit switch by turning off power and gas. Find the switch and disconnect the wires. Use a multimeter to check it. This helps you test a gas furnace limit switch. It also checks temperature sensing switches to stop overheating. Always look for signs of limit switch failure.