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 will provide you with information about the override.
The Extra Hour Function (for Heating and/or Hot Water)
The EXTRA HOUR buttons allow you to switch the heating or hot water ON for up to 3  extra  hours  without  altering  the  programme.  Pressing  either  button  once  will  give one extra hour.  The LoT™ Display will display the message ‘+ 1 HOUR’, to confirm the button has been pressed. 
When  the  green INDICATOR  LAMP  is OFF,  pressing  an EXTRA  HOUR  button switches the heating or hot water ON for just one hour.
When  the  green INDICATOR  LAMP  is ON,  pressing  an EXTRA  HOUR  button extends the programmed ON period by one hour.
Further presses of the EXTRA HOUR buttons will increase the extra hour period by one hour for each button press, up to a maximum of 3 hours.  The LoT™ Display will continue to provide information on the extra hour status.
To  cancel  the  extra  hours,  just  keep  pressing  the EXTRA  HOUR  button  until  the ‘CANCELLED’ message appears on 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 format.
Changing the Installer Parameters
The  ST9400S  has  a  special  Installer  Mode  where  some  features  can  be  adjusted to suit your lifestyle or preferences – these are called Installer Parameters, and are listed in the table below, along with a description of the options that are possible.
INSTALLER PARAMETERParameter NumberDefault ValueOptionsDescription
24hr or am/pm clock display.11212, 2412 = am/pm display,24 = 24hr display
Configure backlight operation.220, 1, 20 = off, 1 = on if button pressed,2 = on continuously
Enable/disable auto time change.310, 10 = disabled, 1 = enabled
Number of ON/OFFs per day.522, 32 = 2 on/offs per day,3 = 3 on/offs per day
Select default time programme.6AA, b, CA = standard, b = at home,C = economy
Reset all parameters810, 10 = do not reset1 = default parameters 
						

							
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  12  hour  AM/PM  to  24  hour.  At  every  step,  the  LoT™  Display will  inform  you  what  the  parameter  means  and  what  option  you  have  selected. The  parameter  number  is  shown  on  the  display  separated  by  a  colon  from  the parameter value.
d. You can change the parameter value by pressing the   or  buttons. At this point  the  description  in  the  LoT™  Display  will  change  and  the  parameter  value will flash. If you press  the value will stop flashing and be saved for use.
e.  Press  to move to the next parameter available for editing.
f.  Keep  pressing   to  step  around  the  list  of  parameters,  and  use    or  buttons to change the parameter value.
g. Any  parameter  changes  that  have  been  confirmed  with  the   button  will  be saved and used.
To Exit Installer Mode:
h. You can exit Installer Mode at any time by moving the slider to the next position and then back again to RUN.
 Note:  Installer  Mode  will  exit  automatically  after  10  minutes  if  the  slider  is  not moved. 
						

							
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 TIME OK?’ will be displayed. Press the green  button to confirm the time is correct.  If you have made a change, the message ‘TIME SAVED’ will show, followed quickly by ‘DATE + TIME COMPLETE’.
c.  Move the slider to the RUN position, to complete changing the time.
What do I do when the clocks go back in October and forward in March?
Your  ST9400S  is  factory-set  to  adjust  the  clock  automatically  at  the  correct  dates, so  you  should  never  need  to  adjust  the  clock  forward  or  backwards  yourself.  It  is possible to disable this particular feature, as described in the section ‘Changing the Installer Parameters’ (page 12). You may also check the section ‘Configuration & Service Data’ (page 18) to see how your Installer has configured your product.
What  should  I  do  if  I  get  ‘lost’  while  programming  the ST9400S?
The LoT™ Display on ST9400S will provide you with help and tips to work through the programming. Should you ever get ‘lost’, the simplest thing to do is to move the slider to the RUN position, and then move it back to the appropriate programming position where you got lost. At this point just follow the instructions again.
What happens if there is a power failure?
In the event of a mains power failure, the ST9400S display will go blank, the indicator lamps  will  go  out,  and  the  control  outputs  will  switch  off.  The  real  time  will  be constantly maintained by means of the built-in battery backup, ready to power back up  as  if  nothing  had  happened  when  the  mains  power  is  restored.  In  addition,  all programmes and settings are stored in a special memory (called NV memory) which requires no power to maintain information, and so will be retained indefinitely.
Should the correct time and date ever be lost, for whatever reason, the message ‘SET DATE + TIME’ will be displayed whilst the slider is in the RUN position. In this case, simply  follow  the  procedure  described  under  ‘Step  1:  Setting  the  Date  &  Time’ (page 4). It should not be necessary to make any changes to your programmes. 
						

							
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 the message: ‘INTERNAL FAULT’
Fault in ST9400SCall Installer
Every few seconds, the ST9400S screen shows the message: 
ST9400S 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 ST9400S 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 ST9400S 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 ST9400S to remind you when the next boiler service is due. Each service is normally a maximum of 1 year apart.
The ST9400S 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 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”.
After servicing your boiler, the Service Engineer / Installer will reset the ST9400S to remind you when the next boiler service is due. Each service is normally a maximum of 1 year apart.
Troubleshooting Guide
This  is  a  quick  guide  to  help  you  diagnose  and  cope  with  possible  problems  with ST9400S. For further assistance, please contact your Installer.
FAQ AND TROUBLESHOOTING 
						

							
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 service is overdue, the Programmer may switch off the heating system, to ensure your safety. If this happens you must arrange an immediate service visit. Contact details should be listed on page 19 of this guide, in the section Boiler & System Service Log.
•  A contact telephone number may also have been programmed into the ST9400S. If  so,  a  message  will  appear  on  the  LoT™  Display  indicating  the  number  you should call.
Countdown to Service
Your  ST9400S  can  indicate  a  countdown  for  the number  of  days  until  your  service  is  due.  This message  will  appear  on  the  screen  every  few seconds, to give you an opportunity to schedule a service visit.
When Service is Due
When your boiler service is OVERDUE the words “SERVICE  DUE”  will  continue  to  flash  on  your screen,  and  you  should  arrange  an  immediate service visit. 
						

							
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  shown. However,  you  should  still  arrange  an  immediate service visit, as this will allow you to comply with the  law  and  ensure  your  gas  boiler  is  operating safely.
BOILER SERVICE REMINDER 
						

							
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  indicate  how  your  ST9400S  has been configured.