Honeywell ST6400S User Manual
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Brand: Honeywell
Category: Motherboard
Type: Operation & user’s manual for Honeywell ST6400S
Pages: 2
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USER GUIDE
TO BE LEFT
WITH USER
ST6400S Full Programmer
42009084-008 R1
INTRODUCTION
The ST6400S 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.
• Separate 24 hour hot water programme.
• Two ON/OFF switching times per day.
• Built-in programme with typical ON/OFF
times for heating and hot water.
• Override buttons for heating and hot water.
• Extra hour buttons for heating and hot water.
• Built-in battery to prevent loss of programme
and time during power cuts.
• 12 hour am/pm or 24 hour clock format.
INSTALLER SET FEATURES
• Boiler Service Reminder.
• Automatic Summer/Winter 1 hour time
change, from BST to GMT.
The ST6400S and other Honeywell controls in your
central heating system will provide comfortable
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 PROGRAMME
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.
AUTOMATIC SUMMER/WINTER TIME CHANGE
If your programmer has been set to do so, it will
automatically change the clock from GMT to BST
overnight on the last Sunday of March and back
again in October. In March the clock will ‘spring’
forward by 1 hour, and in October it will ‘fall’ back
by 1 hour.
OPERATING YOUR PROGRAMMER
with Boiler Service Reminder / Shut-down Feature
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 heating
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 rst
programmed ON time and go OFF at the last
programmed OFF time.
CONT. - The heating will remain ON
continuously.
The HOT WATER SLIDER operates in the same
manner as described above for the HEATING
SLIDER.
OVERRIDE
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.
EXTRA HOUR
The EXTRA HOUR buttons 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, and the words HEATING +1 HR or
HOT WATER +1 HR show on the display to conrm
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 disappears from the
display.
POWER FAILURE
Your programmer has a built-in battery to ensure
correct operation after a mains 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.
BOILER SERVICE REMINDER
By Law, your gas boiler should be inspected once a
year to ensure it is operating safely. If the Programmer
has been set to do so, it 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 below.
If your programmer screen
ashes this message every
few seconds, your Boiler
Service is due soon, and
you should arrange a service visit.
If your programmer screen
shows the words “SERVICE
DUE” then your boiler
service is OVERDUE and
you should arrange an immediate service visit.
If your programmer screen
shows the words “SERVICE
DUE” and “OFF” then your
boiler service is OVERDUE
and the boiler has been 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
the heating 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 above. However, you
should arrange an immediate service visit.
BOILER SERVICE CONTACT NUMBERS
Name Telephone
Contact 1
Contact 2
FAULT INDICATION
If your programmer screen
shows this message, the
product has detected an
internal fault, and must be
replaced, so you should arrange an immediate
service visit.
SERVICE DUE
SERVICE DUE
AM
SERVICE DUE
DAYS
SERVICE DUE