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This unit should have a sensor for flame. Sensor located next to last burner. Looks like a large piece of wire with one wire attached. Clean with sandpaper and retry furnace. Russ
Yes . It should light and prove flame thru sensor. Russ
Can not find any info on that furnace. Searched Trane archives and it comes up obsolete. I will opt for another expert.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel,you can use the paper clip-icon at the right end of the toolbar at the top of this dialog box,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If there is no paper clip-icon, look for the '+attach files' link at left of your send button.
I can mark it up with trouble shooting instructions. You will need a multi meter ($30 at a hardware store) and some experience working with appliances, let me know a lot about your skill sets in those regards.
If none of this in your skill sets, tell me which direction you are from the center of the nearest city and I will look for a few well rated service outfits in your area.
We can go from there.
See if you can find a 'sequence of operations' note on the diagram or elsewhere on the furnace and send me a photo of it.
I also need the brand and model number of the gas valve.
Hello again, that furnace has some pressure switches that I am not familiar with, and lacking a sequence of operation on that furnace I am not confident that I can help you... I will opt out, so other of our experts here can see your question.