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FAQ AND TROUBLESHOOTING
Troubleshooting Guide
This is a quick guide to help you diagnose and cope with possible problems with
your wireless control system. For further assistance, please contact your Installer.
Symptom
Possible Cause
Remedy
ST9120C has a blank
LCD display
No power to the
heating system
Check that there is power to the
heating system
Fault in ST9120C
Call Installer
ST9120C indicates the
system is
ON
, but taps
are running with cold
water.
Temperature controls
are switched off or
set too low
Check that the temperature controls in
the system are set to appropriate levels
Boiler or other
system controls
have malfunctioned
Call Installer
ST9120C shows the
message:
‘INTERNAL FAULT’
Fault in ST9120C
Call Installer
Every few seconds, the
ST9120C screen shows
the message:
ST9120C is counting
down the number of
days until your next
boiler service is due.
Arrange a boiler service before the
counter reaches zero.
After servicing your boiler, the Service
Engineer / Installer will reset the
ST9120C to remind you when the next
boiler service is due. Each service is
normally a maximum of 1 year apart.
Although the heating
is still operating, the
ST9120C screen keeps
flashing the message:
Your boiler service is
overdue
.
Arrange an immediate boiler service.
After servicing your boiler, the Service
Engineer / Installer will reset the
ST9120C to remind you when the next
boiler service is due. Each service is
normally a maximum of 1 year apart.
The ST9120C screen
shows the message:
Your boiler service
is
overdue
and
the boiler has
been automatically
switched off to
ensure your safety.
Arrange an immediate boiler service.
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’
.
After servicing your boiler, the Service
Engineer / Installer will reset the
ST9120C to remind you when the next
boiler service is due. Each service is
normally a maximum of 1 year apart.
Содержание Y9120W Sundial RF2 Pack 4
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