Set Appliance State:

Mains Power Off
CH Demand
ON/OFF Switch ON
CH Temp Selector maximum
DHW Temp Selector min
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow boiler to fire and start to heat system.
Remove heating demand after approximately 1 min.
Does the pump overrun for approximately 90 seconds