Set Appliance State:

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

Observation:

Press the spanner button once on the front fascia.
Press the + button until i6 is displayed.
Does the display show a flow rate above 2 litres a minute?
Press the spanner button again to return to main display.