Set Appliance State:

Mains Power Off
DHW Demand
Selector Switch to HW
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Run DHW Tap allow Boiler to Fire and then Turn Tap OFF.
Time Pump and Fan Overrun.
The Pump should overrun for approx 10 seconds.
The Fan should overrun for approx 60 seconds.