How To Repair A Furnace

The thermocouple is a gas furnace component located near the pilot lite burner. It is a safety device that shuts off the gas if the pilot light goes out or the electrical igniter fails.

If the pilot low-cal won't stay lit, the thermocouple may be faulty and should exist adjusted or replaced. To suit the thermocouple, you must tighten the thermocouple nut with a wrench. Take care non to use too much pressure to the nut -- just tighten it slightly. So try lighting the pilot. If the pilot won't stay lit, supervene upon the thermocouple with a new one of the same type. Here's how to replace a thermocouple:

What You lot'll NeedYou'll want to have these tools on hand to supercede a thermocouple:

• Wrench
• Replacement thermocouple

Step 1: Unscrew copper pb and connectedness nut within threaded connection to gas line. Under mounting bracket at thermocouple tube, unscrew bracket nut that holds tube in place.

Pace ii: Insert new thermocouple into hole in bracket. Be sure steel tube is up and copper pb is down. Under bracket, screw bracket nut over tube. Push connexion nut to threaded connection where copper lead connects to gas line. Brand sure connection is clean and dry.

Stride three: Tightly screw nut into place, just do non over-tighten. Both bracket nut and connection nut should be only a little tighter than if hand-tightened.

© 2006 Publications International, Ltd.
The thermocouple is installed next to the pilot light. A bracket holds
information technology in place, steel tube up and copper lead downward.

Limit Switch

The limit switch is a safe command switch located on the furnace just below the plenum. If the plenum gets too hot, the limit switch shuts off the burner. It likewise shuts off the blower when the temperature drops to a certain level after the burner has shut off. If the blower runs continuously, either the blower command on the thermostat has been fix to the ON position or the limit command switch needs adjustment. Check the thermostat beginning. If the blower control has been set to ON, change information technology to Motorcar; if the blower control is already on AUTO, the limit switch needs adjusting.

To suit the switch, remove the control's cover. Under it is a toothed dial with one side marked LIMIT; don't touch this side. The other side of the control is marked FAN. There are 2 pointers on the fan side; the blower goes on at the upper pointer setting and turns off at the lower pointer setting. The pointers should be set up nearly 25 degrees autonomously. Set the upper pointer at about 115 degrees Fahrenheit and the lower one at virtually 90 degrees Fahrenheit.

If you smell gas while performing these repairs, you'll want to get that leak taken care of right abroad. Larn how to find gas leaks on the next folio.

For more than articles on home repair, check out the post-obit links.

• Furnace Maintenance: Save yourself time and money by learning the steps to go along your furnace in prime condition.
• Major Apparatus Repair : If the furnace isn't the only thing in your house on the fritz, yous can learn how to fix other machines in this article.
• Small Appliance Repair : Once you've tackled the furnace, a toaster or blender seems like child's play. Find out how to fix them here.
• Thermostat Maintenance : To make certain there's actually a problem with your heating system, you may desire to cheque the thermostat, too. Learn how to calibrate a thermostat.

Source: https://home.howstuffworks.com/how-to-repair-gas-furnaces.htm

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