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If your ST9120C 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
OPERATING YOUR CS92A HOT WATER THERMOSTAT
Basic Operation
Your CS92A consists of a sensor element that
is strapped to the metal surface of the hot
water cylinder and a wireless transceiver box
that is normally mounted on a wall surface
apart from the cylinder. The transceiver
communicates with the ST9120C programmer
and regularly sends the hot water temperature
measurement to it.
Battery Replacement
The CS92A batteries should last for a minimum of 2 years. Well before they run out,
CS92A will communicate with ST9120C and it will show the message ‘SENSOR LOW
BATT’ whilst also flashing the tap symbol.
Batteries are accessed by
unclipping the front cover
at the bottom. Note battery
polarity. Reverse process
to refit front cover.
Use 2xLR6 (AA) alkaline
batteries only.
1
2
Sensor element Transceiver
19


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