Set Appliance State:

Mains Power Off
NO Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to carry out its self-check.
Does the pump run during the self-check period?
Note:
The pump can be very quiet so it may be necessary to confirm by gently pressing on the centre screw until it makes contact with the impeller (if it is running a grinding noise will be heard).