SMEG Dishwasher DI612C (about 5 years old) has frequent E4 Fault - Water Temperature Monitoring Malfunction. You are supposed to be able to interrupt the program and switch off the dishwasher. Switch the DW back on, program it again and start the washing cycle. The problems seems to persist. Is there anything I can do? Any help gratefully received. Thanks.

Pat D, March 2010