Good news: descaling with white vinegar for 2 hours, removal and cleaning of the igniter, and cleaning the debris screen worked. It runs reliably again. Hot water galore!
BAD news: the heat exchanger filled with water is slowly leaking into the gas manifold.
Better news: I have a phone to call the repair guy and a car to drive to the beach!
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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