Report "I have a dishwasher model SHV55MO3GB. I get the error message C7. If I switch off, I get a long beep and the number 2 and the 45° button flashes. If I switch off and on again, I either get the same message or it reverts back to C7. Can you tell me what is wrong and if I can clear it myself. Thanking you in advance Sonia Bloch"