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Thanks for the manual. I pulled out the most likely causes and will evaluate each. Again, thanks.

My older Weil Mclain Ultra 105 is giving me fits as it wants to intermittently go from 1 to 2 and back to 1 on startup failing to light, 3. Pressing the reset allows the unit to startup normally, usually. It seems to be getting worse. I've replaced the ignition electrode and do regular yearly...