Set Appliance State:

Mains Power Off
CH Demand
CH Selector in Maximum position
ON/OFF Switch in ON position
Summer/Winter in Winter Position (IN)
Timer Set to ON Position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow the boiler to ignite and run on central heating operation.
Is the heating operating correctly?