For the past 2 weeks the furnace will not turn on unless we turn the thermostat all the way up to 90! It will act like it is starting but then turn off. Then when it turns on it will get up to 80 and then turn off and go back down to 68, any clue what's wrong?
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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....
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