Set Appliance State:

Mains Reset Switch OFF
Isolate Mains Power to appliance as per TOPs P4
Ensure the boiler is cool so that there is demand for preheat
DHW temperature selector to ECO
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Mains reset switch On.
Does the pump run?
Note:
Do not take noise or vibration as a sign of the pump running.