Set Appliance State:

Mains Power Off
CH Demand
Summer/Winter Switch to Winter
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Press reset to cancel the purge cycle countdown.
Is the demand for central heating recognised?
Note:
When a demand is received the radiator symbol will appear on the display and the boiler will commence its ignition sequence.