5
GETTING STARTED WITH YOUR ST9400C
d.  The year digits will now be flashing and ‘SET THE YEAR’ will be displayed. To 
change the year, press the     or   buttons until the correct year is shown. The 
message ‘IS YEAR OK?’ will be displayed. Press the green   button to confirm 
the year is correct. If you have made a change, and the date is a valid date, the 
message ‘DATE SAVED’ will show, and you can move to the next step. If the date 
you  set  was  not  valid,  for example  31  September,  the  message  ‘INVALID’  will 
show and you will be returned to the start of the date setting operation.
e.  The time will now be flashing and the message ‘SET THE TIME’ will be displayed. 
To change the time, press the 
   or   buttons until the correct time is shown. 
Each press of the button will change the time by one minute. Holding the button 
down  for  more  than  a  few  seconds  will  change  the  time  slowly  at  first,  then 
quickly. 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’.
f.  Move the slider to the RUN position, to complete setting the date and time.
Note:  if  the  slider  is  moved  at  any  time  before  the  date  and  time  have  been  set 
correctly,  the  message  ‘DATE  UNCHANGED’  will  be  displayed  briefly,  and  your 
changes will not be saved.
Step 2: Running a Built-in Programme
With the date and time  correct, your ST9400C Programmer will now be operating 
to the built-in programmes. These have been designed to provide heating and hot 
water at typical times throughout the day, but if you want to customise the settings, 
please see the next section ‘PROGRAMMING YOUR ST9400C’ (page 6).