Troubleshooting Guide - Honeywell ST9400C User Manual
7 day programmer 2 channel, 3 on/off per day
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Also See for ST9400C:
- User manual (22 pages) ,
- Installation instructions (2 pages) ,
- User manual (18 pages)
Table of Contents
Troubleshooting Guide
This is a quick guide to help you diagnose and cope with possible problems with
ST9400C. For further assistance, please contact your Installer.
Symptom
ST9400C has a blank
LCD display
ST9400C indicates
that Heating and/or
Hot Water are ON, but
radiators are cold and/
or taps are running
with cold water.
ST9400C shows the
message 'INTERNAL
FAULT'
When the slider is
moved to the HOT
WATER position, the
display shows 'NOT
VALID'
FAQ AND TROUBLESHOOTING
Possible Cause
No power to the
heating system
Fault in ST9400C
Temperature controls
are switched off or set
too low
Boiler or other
system controls have
malfunctioned
Fault in ST9400C
ST9400C has been
conigured as a
Mini-Programmer
Remedy
Check that there is power to the
heating system
Call Installer
Check that the temperature controls
in the system are set to appropriate
levels
Call Installer
Call Installer
Check the Contents page of this
booklet or the 'Configuration &
Service Data' section (page 18)
to see if your ST9400C has been
conigured as a Mini-Programmer.
Call Installer to check if this is
correct for your heating system.
15
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Troubleshooting
