G21 is the latest version, heat exchanger failures more likely with set back thermostats, timed fan delay should be replaced with standard fan control, fan should pre purge eight bolts need to be removed to clean the intake diaphragm, inlet gas pressure is critical for light off, you can also try and ground spark electrode externally to see if module produces when voltage to gas valve is present use a screw driver to see if spark jumps to ground during trial for ignition, I used to teach classes on pulse furnace 30 years retired you can email me if you need to
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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