Checked Tacho coil pulses when motor turned found module faulty. Which module does speed control The one at the top or the one at the back rear?
What does the module do at the bottom? And does it have to be configured when a new one fitted?
On the previous hoover range, which is similar in design to this newer type, spinning on wash was normally due to the motor. Have you checked the insulation of the motor?
From the few of these newer type washer dryers I have seen I thought the bottom module was for controlling the dryer?