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.