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Legacy heater won't stay light

Several years back I purchased a legacy natural gas wall heater with a blower. Recently it has developed a problem. The pilot will light and the heater appears to work fine until it tries to cycle. Then it not only shuts off the burner, but it also shuts off the pilot light. it is like all the gas has been shut off. There is no natural gas smell. I do not believe it is the oxygen sensor tripping because I am able to immediately relight it. Since I can still buy a similar unit for around $200, I don't wish to call out anyone to repair it. But I also don't wish to replace it if the fix might be something simple that I could do myself either.

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Hi, Lets see if I can help you out. You have a wall furnace with a forced air fan, 120volts I am sure. It could be a couple of things happening. You say the pilot will light and the burners fire, but after the heat exchanger reaches it's fan on temp, all just shuts down? Does the blower ever come on? It sounds to me that this unit is shutting off on a safety such as the high limit switch.On wall units that don't use a blower, the limit is located in the upper section of the furnace when you remove the cover. If your fan motor never comes on at all, the heat will open this switch and shut down everything.Not knowing if the fan motor is any good, i am just giving you some ideas what would happen if it was bad, shorted, open windings ect.If the motor never comes on then check to see if you have power to it.If you do, then the motor is faulty. If the motor runs, then go to you're high limit. It is a small round flat disc, black wire in and out back to gas valve.Take a jumper wire and jump across this limit and see if it works for you. If so, it would be worth the cost of replacing the limit.If the blower is bad, replace the furnace.Make sure your thermostat is ok also. You can also jump out the stat to see if the unit comes on and stays on. Jump the red and white, you should have only two.If you do this and it runs, do it several times. If all works well, then replace the stat. So there are several things you can check yourself. Please let me know about the blower motors condition. Good Luck,
Shastalaker7

Posted on Nov 12, 2009

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