Set Appliance State:

Mains Power Off
Ensure NO demands are present
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

When the power is switched ON the boiler will carry out a self check.
The red LED will illuminate together with all of the symbols that can be displayed on the screen.
The red LED will then go out and the green LED and 03 will be shown.
Thereafter the green LED, appliance temperature and mode icon will be displayed. (see initialisation mode above)
This process takes approximately 5 seconds.
Note:If the backlight function has been enabled then the display will illuminate green for approximately 30 seconds during the initialisation period before extinguishing.
If a FAULT CODE is displayed then choose that option below.
BOILER ENTERS INITIALISATION AS DESCRIBED ABOVE
FAN RUNS CONTINUOUSLY
FAULT CODE DISPLAYED
BOILER FIRES WITH NO DEMAND