Set Appliance State:

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

Observation:

Reset the boiler / cancel pump purge as necessary.
Run the appliance and allow the system to heat.
Monitor the boiler flow temperature.
The boiler flow temperature should reach approximately 80°C then maintain flow temperature or shut down without going to a temperature related fault code.
Note:
To speed up the process the heating load can be reduced by turning off some radiators.