Set Appliance State:

Mains Power Off
CH Demand
Allow the heating system to warm up until the burner cuts off
It is recommended the boiler thermostat for heating be set at 50°C
User display control set to HW and CH
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

When the burner has extinguished observe the boiler, after approximately 3 minutes the boiler should re fire.
Note:
After the burner has extinguished it is advisable to increase the boilers heating thermostat to 60°C
The speed at which the boiler reaches temperature can be reduced by tuning off radiators to reduce the heat up time, and then turning them back on once the boiler has reached temperature.