Set Appliance State:

Mains Power Off
CH Demand
DHW Demand
On/Off Switch ON
Boiler Stat set to 1/3 Position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to reach temperature and the burner to extinguish.
Increase the Boiler thermostat to the maximum position.
Observe the appliance it should re fire after a maximum of 5 minutes.
Note:
To reduce heat up time the boiler can be operated in either DHW or CH mode, some radiators can be turned off to reduce heat up time.