Symptom Possible Cause Remedy
ST9100A has a blank
LCD display
No power to the
system
Check that there is power to the
system
Fault in ST9100A Call Installer
ST9100A indicates
that the system is
ON, but radiators
are cold and/or 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
ST9100A shows the
message ‘INTERNAL
FAULT’
Fault in ST9100A Call Installer
Troubleshooting Guide
This is a quick guide to help you diagnose and cope with possible problems with
ST9100A. For further assistance, please contact your Installer.
FAQ AND TROUBLESHOOTING
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