Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach a temperature clamp to the flow pipe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the burner to ignite and the system to heat, the boiler should
maintain and/or shutdown at approximately 82°C.
Monitor the appliance temperature.
Note:
To reduce the time for this test the heating load
can be reduced by turning off some radiators temporarily.