The oF message displayed means overfill. The likely cause is that the inlet solenoid is not shutting of the water.
A float switch in the back of the dishwasher activates the motor to keep pumping the excess water down.
If the dishwasher is to be disconnected from the power supply, make sure the water supply is also turned off to prevent flooding.
The inlet solenoid will need to be replaced.
Lothar
March 2008