Remove the top cover by undoing the two cross-head screws. With the unit pointing forwards, the layout is as follows:

At the rear is the water pump

In the centre is the heating chamber, with the steamer wand control to the right. On top of the heater are two thermal cutout switches (safety for if the heater gets too hot) with four connections.

On the right is the steam want knob

At the front on the left are the control buttons