Set Appliance State:

Mains Power Off
CH Demand
ON/OFF Switch ON
Summer/Winter button set to Winter
CH Temp Selector max
DHW Temp Selector min
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow ignition sequence to run and boiler to ignite.
Does the heating system start to heat with no kettling heard from the primary heat exchanger.