Re: Bosch SGS5312 – dead?
The s/w on the heater switches the neutral, not live.
The live comes direct from pcb via the ntc on top of the heater. Have had a few of these fail in the past. You should read roughly 30 odd ohms across heater. If thats ok and there is plenty of water pressure the I can only really see it being either the pcb (most likely) or the ntc.
Power off please if you have another look. :zap: