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 - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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