Zanussi d/w overfilling

Hi I have been called to repair a zanussi dishwasher model number ZDF14011XA PNC NO 911 516 113 00 SERIAL 42715445 THE problem is it overfills have checked little board on the bottom of the salt chamber there is no pressure switch or float switch in the sump any ideas? Have checked resistance on the wash motor heating element and drain pump all read fine and checked the wires for resistance I suspect pcb faulty?