Honeywell thermostat ST9400S 1 Day Service Programmer User Manual

11

OPERATING YOUR ST9400S
Overriding the Operation Without Changing the Programmes
In AUTO and ONCE operating modes, the OVERRIDE buttons switch the heating or hot water ON or OFF without altering the programme. 
When the indicator lamp is ON, pressing the OVERRIDE button switches the heating or hot water OFF until the next programmed ON time.
When  the  indicator  lamp  is OFF,  pressing  the OVERRIDE  button  switches  the heating or hot water ON until the next programmed OFF time.
The LoT™ Display...

12

FINE TUNING YOUR ST9400S
Changing from AM/PM Time Display to the 24 Hour Clock
Your  ST9400S  can  operate  on  the  12  hour  AM/PM  or  24  hour  clock  formats.  To change the format, ensure the slider is in the RUN position then press and hold the   and  buttons together for about 2 seconds. Ignore the ‘NOT VALID’ message that will appear briefly. All the displayed times will be automatically changed to the new format.
Repeating this procedure will change the clock display back to the original...

1

FINE TUNING YOUR ST9400S
To Enter Installer Mode:
a.  Ensure the slider is in the RUN position, then press and hold  and  buttons together for 8 seconds. Ignore the ‘NOT VALID’ message that is displayed for a few  seconds.  The  message  ‘SET  UP  MENU’  will  show  briefly,  followed  by  ‘SET INSTALLER OK ?’
b. Press the  button to take you into the Installer Mode Parameter Menu.
c.  Parameter  1  is  now  available  to  change.  This  is  to  allow  you  to  change  the clock  format  from...

14

FAQ AND TROUBLESHOOTING
How  do  I  set  the  time  only,  if  the  ST9400S  clock  is  not correct?
Your  ST9400S  contains  a  very  accurate  digital  clock  that  is  factory  pre-set.  Should you ever need to change the time, just follow this procedure:
a. Move the slider to the DAY/TIME position.
b. Keep  pressing  the  green   button  until  the  message  ‘SET  THE  TIME’  is displayed.  To  change  the  time,  press  the    or   buttons  until  the  correct time is shown. The message ‘IS...

1

SymptomPossible CauseRemedy
ST9400S has a blank LCD displayNo power to the heating systemCheck that there is power to the heating system
Fault in ST9400SCall Installer
ST9400S indicates that Heating and/or Hot Water are 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
ST9400S shows...

16

BOILER SERVICE REMINDER
By  Law,  your  gas  boiler  should  be  inspected  once  a  year  to  ensure  it  is  operating safely.  Your  ST9400S  Programmer  has  a  range  of  features  designed  to  help  make sure this service is carried out at the correct time. These features will be programmed by your Installer, maintenance Engineer, or Landlord.
•  If  it  has  been  set  to  do  so,  ST9400S  will  display  a  message  on  the  screen  to remind you that a boiler service is due.
•  If the...

17

Shut-down
If  your  ST9400S  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 any 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...

150022737-006 A
CONFIGURATION & SERVICE DATA
Configurable FeaturesOptionsInstaller Configured (tick appropriate box)
24hr or am/pm clock displayam/pm display
24hr display
Display backlight operationOff
On if button pressed
On continuously
Automatic time changeEnabled
Disabled
Number of ON/OFFs per day2 on/offs per day
3 on/offs per day
Default programmeA = standard
b = at home
C = economy
Configuration Data (to be completed by Installer)
The  table  below  is  for  the  Installer  to  complete  to...