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it is looking like my tankless water heater problems are also a symptom of well/pressure tank/pressure switch problem.as i posted on the plumbing forum i have a bosch aquastar 425efl that will not cycle.i put a pressure guage on the cold water supply for the washing machine when the problem...

I have a Bosch 425 efl that I had installed 2.5 years ago.it supplies a kitchen sink, a full bath and a washing machine.it worked wonderfully until a week ago. Now when I turn on the hot water the pilot lights, the power vent comes on, the burner lights and then goes out.it still occasionally...