Lennox g12 furnace- furnace lights but no air. Blower does not appear to be working. Set thermo to fan mode, but hear loud buzz from unit. Believe it might be the blower motor. Anything else to look for or try?
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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....