Set Appliance State:

Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4

Observation:

Is diverter valve flow adjuster open sufficiently?
Adjustment using screw.
PASS this test if flow rate does not increase above 9.5 litres/minute.
FAIL this test if flow rate increases above 9.5 litres/minute.
Note 1:
With tap fully open flow rate should be adjusted to 13 litres/minute.
Note 2:
Adjuster is 1/4 of a turn between minimum and maximum flow rate.