Set Appliance State:

CH Demand
Temperature control set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary and allow boiler to complete its self check if it has not already done so.
Does the pump run?
Notes:
Pump is fitted external to appliance.
Do not take sound or vibration as evidence of the pump running.