Honeywell thermostat ST6400A 1 Day 2 Channel Programmer User Manual

							USER GUIDETO BE LEFTWITH USER
ST6400A  Programmer
42009084-006 R1
INTRODUCTION 
The  ST6400A  programmer  controls  your  central 
heating  system.  It  will  enable  you  to  select  the 
times  when  heating  and  hot  water  are  switched 
ON and OFF.
FEATURES 
• 24 hour heating programme.
• 24 hour hot water programme. 
• Two ON/OFF switching times per day.
• Built-in  programme  with  typical ON/OFF 
times.
• Override buttons for heating and hot water.
• Extra hour buttons for heating and hot water.
• Built-in battery to prevent loss of programme 
during power cuts. 
• 12 hour am/pm or 24 hour clock format. 
The  ST6400A  and  other  Honeywell  controls  in 
your central heating system will provide comfort-
able  temperatures  in  your  home  when  you  want 
them.
12 HOUR AM/PM or 24 HOUR CLOCK DISPLAY 
Your programmer can operate on 12 hour am/pm 
or  24  hour  clock  formats.  To  change  the  format, 
ensure  the  setting  slider  is  in  the RUN  PRO-
GRAMME position then press the + and - buttons 
together  for  about  5  seconds.  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.
OPERATING YOUR CONTROLLER
For normal operation the setting slider must be in 
the RUN PROGRAMME position. 
A  red  indicator  lamp  shows  when  the  heating  or 
hot water is switched ON. 
Two  sliders  are  provided  to  select  how  the  heat-
ing and hot water are controlled. 
The HEATING SLIDER has four positions:
 OFF - The Heating will remain OFF. 
 AUTO - The heating will be switched ON and 
OFF automatically  according  to  the  heating 
programme. 
 ONCE - The heating will come ON at the first 
programmed ON time and go OFF at the last 
programmed OFF time. 
 CONT. - The heating will remain ON continu-
ously. 
The HOT  WATER  slider  operates  in  the  same 
manner  as  described  above  for  the HEATING 
SLIDER.
EXTRA HOUR 
The EXTRA HOUR buttons switch the heating or 
hot water ON for up to 3 extra hours without alter-
ing  the  programme.  Pressing  either  button  once 
will give one extra hour, and the words HEATING 
+1  HR  or HOT WATER  +1  HR  show  on  the  dis-
play to confirm the button has been pressed.
When the red indicator lamp is OFF, pressing the 
EXTRA HOUR button switches the heating or hot 
water ON for just one hour.
When the red indicator lamp is ON, pressing the 
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  display  will  change  to  show  the  number  of 
extra hours, for example HEATING +3 HR or HOT 
WATER +2 HR.
To  cancel  the  extra  hours,  keep  pressing  the 
EXTRA  HOUR button  until  the HEATING  +  (1,2 
or 3) HR or HOT WATER + (1,2 or 3) HR disap-
pears from the display.
OVERRIDE 
The OVERRIDE buttons  switch  the  heating  or 
hot  water ON or OFF without  altering  the  pro-
gramme. 
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.
RESET 
To  reset  the  programmer  back  to  the  original 
built-in programme press the RESET button with 
the tip of a pen or pencil. 
POWER FAILURE
Your programmer has a built-in battery to ensure 
correct operation after a main supply power cut. 
No action should be necessary following a power 
cut  of  up  to  4  days.  Longer  power  cuts  may 
require you to re-programme.   
						

							SETTING YOUR PROGRAMMER
SETTING THE CORRECT TIME
To set the correct time, open the flap on the front 
of the programmer.
STEP1 
Move  the  setting 
slider  to  the SET 
TIME position. The 
time on the display 
will now be flashing 
to indicate it can be 
changed.
STEP 2 
To change the time, press the + or - buttons until 
the correct time is displayed. 
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.
STEP 3 
Moving the setting slider to the next position com-
pletes setting the time.
SETTING THE HOT WATER PROGRAMME
The  hot  water  programme  has  two ON/OFF 
switching  times  per  day.  Each  time  can  be  set 
between 3.00 am and 2.50 am (on the next day) 
to  allow  you  to  programme  the  hot  water  to  stay 
on past midnight, if required.
STEP 4
Move  the  setting  slider  to  the SET  HOT WATER 
position. The words HOT WATER will now be vis-
ible on the display and the first ON time will now 
be flashing.
STEP 5
Use  the + and - buttons  to  set  the  first ON time. 
Each press of the button will change the time by 
10 minutes.
STEP 6
Press  the NEXT  ON/OFF button  once  to  display 
the first OFF time. Set this time using the + and - 
buttons.
STEP 7
By  pressing  the NEXT  ON/OFF and + or - but-
tons the remaining ON/OFF times can be set.
*NOTE*
1. When  pressing  the +  button,  the  next ON or 
OFF marker  may  start  to  flash.  If  this  hap-
pens the next programme time will have been 
changed.  Press  the NEXT  ON/OFF  button  to 
check and adjust this programme time if nec-
essary. 
2. When  pressing  the - button,  the  previous 
ON or OFF marker  may  start  to  flash.  If  this 
happens  the  previous  programme  time  will 
have  been  changed.  Follow  the  procedure 
in  “REVIEWING  PROGRAMME  TIMES”  to
check and adjust this time if necessary. 
Moving the setting slider to the next position com-
pletes setting the hot water programme.
SETTING THE HEATING PROGRAMME
The heating programme has two ON/OFF switch-
ing times per day. Each time can be set between 
3.00  am  and  2.50  am  (on  the  next  day)  to  allow 
you  to  programme  the  heating  to  stay  on  after 
midnight if required.
STEP 8
Move the setting slider to the SET HEATING posi-
tion.  The  word HEATING will  now  be  visible  on 
the display and the first ON time will be flashing.
STEP 9
The required heating programme can now be set 
by  following  the  same  procedure  as  “SETTING 
THE HOT WATER PROGRAMME” in steps 5 to 7. 
STEP 10
Moving the setting slider to the next position com-
pletes setting the heating programme.
REVIEWING PROGRAMME TIMES
To  review  your  hot  water  programme  move  the 
setting slider to the SET HOT WATER position. 
To review your heating programme move the set-
ting slider to the SET HEATING position. 
To  review  the  programme  times  press  the NEXT 
ON/OFF  button  repeatedly.  Any  of  these  times 
can be adjusted by using the + and - buttons. 
+ AND -BUTTONS
LCDDISPLAY
ON/OFFMARKER
HOT WATERINDICATOR
OVERRIDEBUTTONS
HEATINGINDICATOREXTRA HOURBUTTONSHEATINGSLIDER
SETTINGSLIDER
HOT WATERSLIDER
NEXT ON/OFFBUTTON
RESET
IF DISPLAY REMAINS BLANK AFTER SWITCH ON - PRESS RESET 
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HOT WATERHEATING
BUILT-IN PROGRAMME
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HOT WATERHEATING
PERSONAL PROGRAMME