I have a Trane 78xe heating system. Some times it will not start up. I have to turn off the emergency switch then wait about a minute and then it works great for a week or two then the same thing happens again. Any thoughts on how to trouble shoot? Thanks in advance
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Has anyone had an occurrence of a Laser 730 or 731 over firing?
The top of the heat chamber and the heat exchanger glow red on high when this occurs....