Set Appliance State:

Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

The DS number can be disrupted if the power to the boiler is isolated or reset too soon after being switched on.
To avoid this wait at least 60 seconds between power off/on, and or reset.
The DS number can be changed by pressing + or - when the value is displayed.
Select the number that corresponds with your model.
Press and hold MODE for 5 seconds to confirm.
To exit the diagnostic menu, press the MODE and + buttons
at any time.
Does the DS number set correctly?
DS NUMBER SET CORRECTLY
DS NUMBER CANNOT BE SET