Set Appliance State:

Mains Power Off
CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to fire.
Remove heating demand.
The fan should overrun for approximately 30 seconds,
The pump should overrun for approximately. 3 minutes.
Note:
The pump is not a an integral part of the appliance and is located elsewhere on the system.