we have a zanussi Z716WT83BI Washer dryer. Prod no. 914606600 03. It has an EH0 error in display as soon as dial turned to a program. I read it may have something to do with the electrical supply? I have checked the plug and socket. tried it in another socket and tried a new mains filter in case that was causing the problem. I have also checked for earth faults on the elements. anyone had this problem before? I cant find out how to run a diagnostic test on this model.