How to Light a pilot light on a furnace.

If your furnace is more than 20 years old, you will have to light the pilot light on it.The furnace LEDs will flash a code if something goes wrong with the gas furnace.Inexpensive and easy to replace, these ignitors can wear out quickly.If the furnace isn't producing heat, you have to look at the burner to see if the pilot is on.

If the pilot is not on, you can relight it yourself, but there may be a need for servicing.Two of the most common reasons for the pilot to go out are carbon build up in the tube and a faulty thermocouple, and while homeowners can fix these problems themselves, a pro can do a better job.

You don't want the furnace burners to turn on while you're working, so turn down the room thermostat to its lowest setting.If the furnace has a power switch, you can turn it off.

Take the furnace cover off and look for the gas valve and gas control, which have three settings: "on," "off" and "pilot."There are three tubes coming from the bottom of the gas valve.If you want to hold the flame to light the pilot, you should follow one of the two smaller ones that are inside the burner compartment.You might need a head lamp to see this point.