Burners won't ignite


Old 12-11-02, 10:39 PM
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Burners won't ignite

I have an older model Trane natural gas furnace.
Model #: 1 FGU-134A. S/N: 8E-36340. Type: 741-248B. 34,000 input BTU/hr. Year of manufacture unknown. The burners will not ignite. The thermostat is set high enough to come on. The pilot light is lit and stays on. The flame is blue and evenly distributed between the 2 paths from the orfice. The bi-metal switch is well within the flame. I cleaned the switch with no results. The gas valve is energized but the burners won't light. I can hear the valve energizing by flipping the fuse switch on and off. I crossed the white and red wires @ the thermostat with no results. If I use a lighter I can get a 1/2" or smaller flame from each burner tube inlet. I checked both high and low voltage circuts with a DMM and all seem ok. I live in Flint, Michigan. Temps may be in the 20's @ night with day temps in the 40's. Thank goodness for the heat wave! Any help will be appreciated. Thanks.
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Old 12-11-02, 11:13 PM
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Thumbs up Good description of your problem.


From what you describe it sounds like the gas valve is bad.

I would recommend a heating specialist check it and replace if necessary.

If the valve is opening slightly you have to be carefull.
If a valve doesn't open quickly, the way it's suppose to, you could get a delayed ignition, where the flame could roll out of the furnace.
Old 12-12-02, 07:41 AM
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Thanks Greg

I went to an appliance dealer and confirmed the valve problem with them. Purchased a new valve and installed it. Furnace works fine now. Can't tell you how much I appreciate your help. Again, thanks.
Old 12-12-02, 05:21 PM
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gregh is right again!

he stresses the importance of good info, and showed what can be done with it.
Old 12-13-02, 09:23 PM
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Let me re-interate GregH's announcement!

In the "read this before posting" statement, it said to read through previous postings before posting your own. Then it said to give as MUCH info as possible, even the smallest , seemingly insignificant detail could matter. While reading the announcement I also learned some of the "trade" jargon and tried some of the other replies before posting my own. It really does pay to read first, even through 5 pages of questions. I can't say thanks enough, especially since this forum probably saved me $100 or more. I have already refered others to the site and wouldn't hesitate to again.

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