Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Cancel purge cycle & if required, reset boiler.
Run the appliance and allow the system to heat and reach maximum temperature.
Boiler flow temperature should reach approximately 75°C then maintain flow temperature or shut down without going to the A08 fault code.