Problem with indesit WIXE127 new therm & new control still F-03?

Hello,I am having trouble with my indesit WIXE127 it is only 14 months old and comes up with TEST when I switch it on.I can clear the TEST mode by holding down the reset button and all is ok for 5 secs then END & F-03 comes up.I have fitted a new therm probe that didn't make any difference.so I fitted a new control panel which also made no difference.I have checked the wires with a multimeter and all seems ok.any help would be much appreciated.Thanks Andy