9 Trouble-shooting ... in the display appears Possible cause Solution • Faulty electrical connec- tion. • Overvoltage  Cancel the error message by pressing the  button. Disconnect the power supply for about 1 minute. Switch the power supply back on again and select a new programme. If the error appears again: disconnect the power supply. Have an electrician check the house instal- lation. If the error appears again: note down the error message in full and the serial number (FN) and then disconnect the power supply. Call Customer Services. Possible cause Solution • The childproof lock is switched on.  Refer to the section on how to operate the appliance with the childproof lock activated. Switch off the childproof lock. ... in the display appears 56