Set Appliance State:

CH Demand
CH temperature control turned to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Run the appliance and allow the system to heat.
Monitor the appliance flow temperature on the display, the appliance should run to its maximum temperature of approximately 80°C and then either shut down or modulate to maintain temperature.
Note:
To speed up the process the heating load can be reduced by turning off some radiators.