No hot water

Unfortunately, no hot water comes out with me. The coffee flows without problems. Already thoroughly blown through all hoses, replaced both solenoid valves and the pump, brings nothing. The machine starts pumping water but something is interfering on the way to the hot water nozzle. Then comes an error with no water in the water circuit. When I start the machine the next day, the residual water flows out of the nozzle. Who knows where the problem could be?

Thanks in advance.

I have now noticed something new. When I want to have hot water comes none.

Only the pressure is built up and then comes an error as usual water circuit empty fill water circuit. Then I switch the machine off and on again. The error is then still on the display. When I press Ok, the hot water comes out wonderfully. When I want to have hot water again, an error comes up again. So by turning the machine off something is opened. Does anyone have any ideas?

Thank you.