WMF Bistro 8400

[SevernikCoffeeCulture]

Please advise, I'm repairing a WMF 8400 at home. The pump doesn't work. The motor and pump are fine, the switching relay is fine too, but there's no voltage from the unit to the relay. I replaced the entire front panel with the control units and the problem persists. Do you know where the problem could be? There's no voltage on the wires, isn't the ground switching through something else?
I'll also try my luck here - does anyone have a configtool for the bistro 8400? I'm repairing a WMF at home and I have a problem with the pin
I'm repairing it for fun and so that I can have a big coffee maker at home, but it's still not working. Is there a condition, for example with the boiler, that the relay wouldn't switch the pump?

 

[SevernikCoffeeCulture]

Just a small addition. When the relay is not switched on, I measure 114 V, is that okay? How does the pump switch on? I can't find an electrical diagram anywhere.