Greetings, I had friends around this morning and as a result the Evo has been switched on all day. Mid morning I noticed that the heater cartridge display had turned to off. I did not think anything of it at the time, then half an hour later it happened again. I had definitely not touched it meanwhile!
So, thinking out loud, the display just tells you the temp in the group. Is it a fair consideration that one or both of the heater cartridges are failing, or might there be something else at play? If they are failing, does it make sense to replace them both, and is this a job that me, as the village idiot could do or do I need to find a coffee engineer?