the most likely cause is the top wash arm holes are blocked by food debri or larger dishes are preventing the arm from turning
the tablet requires that the top washa rm sprays water onto it and breaks it up
hi
its almost certainly the module .the circuit board that sits at the back left hand side when looking at the machine with the back panel off.sometimes its just a dry joint or burnt contact where the connectors clip on.pull the wires off and look at the board connectors for burnt solder joints...