I have a Trane XE 70 furnace. Here is my situation. The furnace has electronic ignition which appears to be working fine. The burner will only light sporadically. I can get the burner to light if shut-off power to the furnace and turn it back on.
I did notice that when the burner was working, the fan would turn off prior to hitting my temperature set-point. It would do this several times before reaching set-point. I expected the furnace to overheat and shut-off the burners, but this did not happen.
In any event, I had a techincian come out and the were not able to daignose the problem. They fell back on the statement that the furnace was 18 years old and should be replaced.
I have changed the thermostat and will monitor that to see if it corrected the problem. Any thoughts on this otherwise? Is additional info needed to assess this problem?
Problems related to residential installations.
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