Other G50UH Reviews
Most of the talk on the forums about the G50UH seems to be about ignition problems; either the furnace will not light or ignites and then goes out. For example, a thread on diychatroom.com reveals a discussion of a Lennox G50UH that will not light. The experts advise cleaning out the vent pipe and the draft housing.
A post on doityourself.com details a similar problem a homeowner is having with his Lennox G50UH furnace. The flame goes out occasionally, and the homeowner has tried several solutions listed in the owner's manual. The last suggestion he mentions is to clean the flame sensor with steel wool, which he has not tried yet. The experts respond that this often solves the problem.
Another Lennox G50UH owner posts a question on justanswer.com about his furnace not staying lit. The online contractor leads him through a series of steps to test for the problem. The contractor concludes that the problem is in the thermostat of the outdoor unit.
The G50UH is available in different models which vary in efficiency and capacity.
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The Lennox G50UH furnace comes with a 20-year limited warranty on the heat exchanger. All other parts are covered by a five-year limited warranty.