Set Appliance State:

Mains Power Off
Hot Water thermostat selector to Maximum
Boiler ON/OFF switch to ON
The SUMMER/WINTER switch to SUMMER
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Run the hot tap with a flow rate of approximately 8.4 litres per minute.
Is there a temperature rise of approximately 40°C