Manual Honeywell ST9100S (page 17 of 18) (English)

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Shut-down

If your ST9100S 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 the 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

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Honeywell ST9100S Manual

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