Our dishwasher has developed the following fault on selecting any cycle, even after a reset, the machine tries to start the drain pump and it operates for about 1-2 seconds and then the machine beeps. This then continues every 10-15 seconds with the pump operating and then the machine beeping. The only lights showing are the selected cycle. I have taken the drain pump off and checked it and it does work ok. There are no obvious blockages. The machine is about 6 years old with no previous problems
Any help would be appreciated.