AEG Favorit dishwasher. Sometimes the machine will not make hot water for the rinse cycle. I have run the 65*C cycle with a volt meter on the heater element . I have put a K type thermocouple wire inside the washer through the top door seal. The hot wash cycle works ok. Voltage to the heater element and water temperature gets up to 59.8*C. However the hotwater rinse cycle there is no Voltage to the heater element. The machine works through the cycle to the end of the program . No heat for drying the dishes ..? Outlet is clear. No water left in base of washer cabinet. Filters all clean. Rinse aid dispenser is triggered - checked voltage signal to rinse aid and liquid level checked. If the machine is left overnight with the mains plugged removed the next wash program 70 *C, 65*c will work correctly. Leave the mains plugg in and the next program will fault as described …?? Main program/board fault ?