Most likely I'm afraid.Any ideas about a fix or has the water fried something?
There is no mains switch in the 6910 - Active is connected directly to the pumps, heaters, solenoids etc . The neutral wire on each device contains the opto-coupler & triac switches as part of the control board which complete the circuit when activated by the micro-controller. The triacs can fail 'short circuit' and cause the circuit to operate whenever power is on to the machine.
Closing the steam tap with the pump running continuously will cause a pressure build up and pump overload.
The usual repair method involves control board replacement which is fairly complex and best left to a specialist.