Set Appliance State:

Mains Power Off
CH Demand
ON/OFF switch ON
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow fan to run, boiler to fire and boiler to run in CH mode for a few minutes.
Using FGA temp clamps measure the temperature of the flow and return pipes close to the boiler the boiler and ascertain temperature difference between flow and return.
Expected differential approximately 20°C or less.