Error Code E4 indicates no temperature rise detected across the inlet and outlet. This typically happens due to very high cold water temperatures or if the heater is not activating correctly.
First, close the hot tap and wait 10 seconds before reopening it to see if the issue resolves itself. If the error persists, isolate the electrical supply and cease using hot water. This scenario usually requires a professional assessment to determine the exact cause and rectify the issue.
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