Set Appliance State:

Mains Power Off
CH Demand
Selector switch to heating and hot water position
CH temperature selector to maximum
DHW temperature selector to minimum
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow boiler to fire under heating demand.
Remove heating demand via room thermostat or clock.
Does the pump continue to run for approximately 3 minutes?