In order to remove the error code: 2 options: 1 Reprogram the CCU which is known as an ETNA CCU (module). This will require a hardware key and an ESAM unit (neither of which are readily available to purchase). 2 Install a pre-programmed ETNA CCU for the correct model. I’m adding this info in 2021 in order to help anyone who encounters the same problem. BTW - I’m a field service engineer.
Ensure machine is isolated. Take the top-off, which is held in by 2 philips screws at the back. Then depending on the model there may be a bracket support plate at the front which needs to be removed, either way the front display/control panel is held in place by 2 screws on the top of the machine and either 2 or 3 screws through the front of the soap dispoenser housing. The timer/display module is generally held in place with plastic clip-mouldings. The buttons are located behind the circuit board…generally.