Specs for a Gibson Residential Gas Furnace Limit Switch

Function

• Before you order a new limit switch for your Gibson residential gas furnace, you should have a basic understanding of how the component works. This may help verify that the limit switch and not another component has failed to avoid ordering the wrong replacement part. The limit switch controls the blower. It only blows air after it has been warmed by the furnace to prevent cold air from being sent through your home’s ducts. If only cold air is coming from your home’s vents, the limit switch may be at fault. A defective limit switch also can extinguish the pilot light. It may falsely sense that the igniter is bad and close the gas valve, which will cause the pilot light to extinguish.

Specifications

• Specifications for the limit switch can vary based on the Gibson residential gas furnace you own. Nordyne doesn’t manufacture furnaces with universal limit switches. The component’s size and capacity usually differs by model. As a result, you’ll need to either locate the serial number of the existing switch or use the model number and year to determine the limit switch type used on your furnace.

Limit Switch Location

• A limit switch is usually found in the same general location on most Gibson residential gas furnaces models. Shut off the furnace and open its main panel. Once open, toward the rear of the furnace are a bunch of colored wires. Just behind the wires is the limit switch. The switch is a round dial with one wire attached that’s positioned on a black or silver faceplate. The serial number is etched on the plate.

Alternative Way to Identify Component Specifications

• If you’re unable to locate the limit switch’s serial number, you should be able to order a new limit switch through Gibson directly. They’ll be able to determine the part you need if you provide them the furnace’s model number and year. The information will be in the furnace manual. Additionally, you should be able to find the model number and year on the exterior of the furnace or inside the panel, depending on the model you own. If you’re unable to confirm the model and year of your furnace, contact Gibson for assistance. They should be able to provide you with tips to locate the model number and year based on a basic description of your residential furnace. Additionally, Gibson offers a 10-year limited warranty that covers all parts, according to their website. For this reason, you may want to contact Gibson to see whether or not the limit switch is still covered under warranty before you order a replacement switch, which could save you the replacement part cost.