Always start by unplugging your device and wait until it is fully cooled down (the temperature reading is analogue, so you can use it as an indication)

Then remove the water compartment. Place it far from where you are working on the device.

The device is sectioned into three general compartments:

Bottom compartment (easiest to access): contains a simple controller board that allows you to turn the device on/off with a toggle button and turns it off automatically after a prolonged period of disuse.

Middle compartment (hardest to access): contains the cabling, the pump, and a valve.

Top compartment: contains the heating block with heat switches and fuse, the levers, the indicator lamps, and some water tubing.

For the PCB replacement, you only need to access the bottom compartment!