Set Appliance State:

Mains Power Off
CH Demand
Boiler CH thermostat set to 50°C
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to reach 50°C and the burner to shut down.
Increase the boilers CH thermostat to Maximum (85°C).
Observe the appliance it should re fire after approximately 3 minutes.
Note:
This setting is adjustable in the boiler parameters if the boiler does not behave as described above it is advisable to check the parameters, refer to adapt for guidance.