CL is not an error. This means that the CHILD LOCK is activated. The Child Lock function is used to prevent any setting being changed whilst the machine is in operation.
Activating or deactivating this option varies by model. For safety reasons, once set, the Child Lock does not disengage the Power button from operating.
Setting and Inactivation
Then you will hear a beep, the display will then indicate CL and it will be activated. It is the same procedure to de activate.
(display when activated)