Error Code E3 signals that the water heater’s outlet temperature has exceeded 75°C. This is a critical safety issue that prompts the heater to shut down to prevent scalding or damage.
If you see Error Code E3, immediately turn off all hot taps and isolate the electrical supply to the heater. Allow the system to cool. Do NOT attempt to reset or restart the heater yourself, as repeated occurrences indicate a serious problem.
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