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Troubleshooting Guide
This is a quick guide to help you diagnose and cope with possible problems with
ST9100C. For further assistance, please contact your Installer.
Symptom
ST9100C has a blank
LCD display
ST9100C indicates
that the system is
ON, but radiators
are cold and/or taps
are running with cold
water.
ST9100C shows the
message 'INTERNAL
FAULT'
FAQ AND TrOUBLeSHOOTING
Possible Cause
No power to the
system
Fault in ST9100C
Temperature controls
are switched off or set
too low
Boiler or other
system controls have
malfunctioned
Fault in ST9100C
remedy
Check that there is power to the
system
Call Installer
Check that the temperature controls
in the system are set to appropriate
levels
Call Installer
Call Installer
1
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Table of Contents
Troubleshooting
Need help?
Do you have a question about the ST9100C and is the answer not in the manual?
Questions and answers
How to set hot water times
To set hot water times on the Honeywell ST9100C:
1. Move the slider to the PROGRAMME position.
2. The display will show the current programmed times.
3. Use the + or - buttons to adjust the 'On' and 'Off' times to suit your schedule.
4. Set different times for each day if needed, as the controller supports seven-day programming.
5. Once finished, move the slider back to RUN to activate the new settings.
The built-in memory will retain the program even if power is lost.
This answer is automatically generated