asked

I have a Bosch tankless water heater model 2400E NG. When I turn on the hot water, it runs for a while and then sometimes goes cold. I get numerous E0 error codes and occasionally an E9. Occasionally, it goes into thermal runaway, making the water too hot. This seems to happen when I try to modulate the temperature by turning the shower control toward cold. What could be causing these issues?

August 8th, 2023

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