Buffer battery for the electronics was drained

• Acknowledge the error message
• Then set the current date and time
• Work with the appliance for a while (so that the battery can be recharged)
• If the error still appears, contact the responsible service partner (make a note of the message on the display)

Date value is invalid after replacing the buffer battery

Carry out a software update to the latest software

• Set the current date on the UI board
• Open the date setting by pressing and holding the START button and enter the current date