The Error 1 issue needs to be resolved by Siemens themselves. There's apparently a way to get to the error to see what it's for in the diagnostics menu (Menu -> Diagnostics -> Alarms -> Click on Alarm -> Help) should give you a bit more info but usually it just says to contact Siemans.
As for the leaky valve, if the leak is coming from the valve itself it's most likely that an o-ring isn't sealed properly or has gone bad. You could try getting another o-ring if the valve you bought didn't come from one, or you could try to re-attach the valve so it doesn't leak.