Set Appliance State:

CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

if required, reset boiler.
Run the appliance and allow the system to heat.
Monitor the boiler flow temperature.
Boiler flow temperature should reach approximately 85 - 88°C then maintain flow temperature or shut down without going to the fault code.
Note:
To speed up the process the heating load can be reduced by turning off some radiators.