What does F.63 mean?

An error has occurred with the EEPROM (Electrically Erasable Programmable Read-Only Memory), which stores critical configuration data for the boiler's electronics.

• Main electronics board of the boiler is defective.

Click steps to track your progress.

1. 1

   Press the fault clearance key on the boiler to reset it.

2. 2

   Note the fault code and any other details displayed.

3. 3

   If the fault persists, contact Vaillant Service Solutions, as this indicates a fault with the main electronic control unit.