Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Main On/Off Control in the On position
Heating Control to Hot Water Only
DHW Temperature Control to Maximum
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

If a fault code is displayed press boiler 'Reset' button.
Is there a 35 degree C rise in temperature at a flow rate of 9.3 litres per minute?