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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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