17
Shut-down
If your ST9400S shows the words “SERVICE
DUE” and “OFF” then your boiler service is
OVERDUE and the boiler has been automatically
switched off to ensure your safety – you should
arrange an immediate service visit.
If set to do so, it may be possible to obtain limited
use of the boiler by pressing any EXTRA HOUR
button. Each button press will allow operation of
the boiler for 1 hour at a time, and the screen
will display the message “On 1h” as shown.
However, you should still arrange an immediate
service visit, as this will allow you to comply with
the law and ensure your gas boiler is operating
safely.
BOILER SERVICE REMINDER
