15 year old lennox central heat/air outside 5 ton unit. got fas to valve , when I try to start heater chamber blower starts, and then I hear a click, but get no gas ignition, how do I tell if problem is in valve or ignitor?
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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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