furnace pilot light keeps going out

Old 11-29-03, 04:41 PM
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furnace pilot light keeps going out

Ijust bought an old house, 1920s. The furnace is an older Lennox. We have to relight the furnace 2x per day. What could be wrong?
Old 11-29-03, 08:08 PM
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Hello: connie7

Older models of furnaces, like the one described here form the 20's, use a thermocouple to keep the safety device open. When the T-Couple becomes weak with usage and time, it cannot keep the safet device open.

When that happens, it will cause the pilot to shut off. Replacing the thermocouple usually resolves the problem. as long as the pilot flame is in direct contact with the T-Couple and the pilot flame is all blue in color.

The thermocouple is the part the pilot flame is in contact with. The opposite end of the thermocouple is threaded into the gas valve. This end must be carefully unscrewed out of the gas valves control using a small open ended wrench.

A thermocouple is generic except for it's length. Thermocouples are made in different lengths. Measure the removed part or take the one you remove to any hardware store and replace it with an exact duplicate in length. The parts cost is very nominal.

New thermocouple packages will contain complete do-it-yourself installation instructions and pictures. The package also contains additional clips of various assortments.

Not all the parts contained in the package with the thermocouple will be needed. The packages contain an assortment of holding parts and clips that are generic and designed to fit a wide variety of applications.

Regards & Good Luck, Forums Monitor, Web site Host & Multiple Topic Moderator. Energy Conservation Consultant & Gas Appliance Diagnostics Technician.
Old 11-30-03, 07:17 AM
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connie you may want to look and see if there is trash on your burners. open the door so you can see the burners and the pilot light. with the heat off and the burners not lit have some one turn on the heat at the thermostat. do not turn off your pilot light. make sure you can see the burners but keep far enough back. if your burners light off and the flame rolls back out of the furnace then the top of the burners could have soot on them. if they do shut off the power to furnace and vacuum the soot off of the burners. then fasten the door and turn power back on. then turn temperature up on your thermostat. also i would check and make sure the door to the burners is shut tight. also check any ductwork going to your furnace and make sure it is not broken or the duct has come loose.

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