Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Heating Switch OFF
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Test 1:
Run the DHW tap with a flow rate of 4 l/min.
The cam should be moved fully over to the left pressing the microswitch.
Test 2:
Turn the DHW tap off.
The cam should now return to the CH position which is fully to the right looking at the front of the appliance.
(this can be confirmed by pressing the right hand side of the cam it should not move downwards any further)