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Hello, its either a low water flow condition but you have verified its on high, we may need to verify the flow rate by mechanical means. The water filters or line strainers might be clogged.
Secondly there might be air inside the heat exchanger, reducing water flow (a vapor lock sort of condition)
Lastly the high limit sensor might be bad, we will need to verify the temperature at the probe insertion point.
Let me know a lot about your skill sets in these regards ***** ***** I can coach you most effectively.. we can go from there.