Honeywell ST9400C User Manual

Guide to the Use of the ST9400C Programmer

How do I use the OVERRIDE buttons?

There are two OVERRIDE buttons, one for
Heating and one for Hot Water (marked on the
image).

To turn the Hot Water on and override the set
programme press the Hot Water OVERRIDE
button marked in the picture. The indicator light will
light up to confirm the Hot Water is on.

To turn the Hot Water off again press the
OVERRIDE button.

Alternatively the next time the programmer is set
to switch on or off the override will be cancelled.

The OVERRIDE button will only work in the AUTO
and ONCE modes. It will NOT work in the OFF or
CONT modes. To change the mode press the
button marked ‘A’ for Hot Water and ‘B’ for Heating
in the picture. Each time you press the button it will
move through the list of modes above it.

List of
modes for
Hot Water

Hot Water
indicator light

A

Hot Water
OVERRIDE

Heating
indicator light

List of

B

modes for
Heating

Heating
OVERRIDE

To override the Heating follow the same
instructions as above but with the Heating override
button marked in the picture.

How do I use the EXTRA HOUR buttons?

There are two EXTRA HOUR buttons, one for
Heating and one for Hot Water (marked on the
image).

Press the button once to bring the Heating or Hot
Water on for 1 hour. Press the button a second
time to bring them on for 2 hours and a third for 3
hours. To turn the override off press the button a
fourth time.

The EXTRA HOUR button will only work in the
AUTO, ONCE and OFF modes. It will NOT work in
the CONT mode. To change the mode press the
button marked ‘A’ for Hot Water and ‘B’ for Heating
in the picture. Each time you press the button it will
move through the list of modes above it.

Heating
EXTRA HOUR

Hot Water
EXTRA
HOUR

honeywelluk.com

This user guide is for guidance only and at the time of production represented the latest information available to Honeywell from various sources.
Honeywel
cannot accept any responsibil

l reserves the right at any time and without notice to change any product, specification or any other information contained in this publication and

ity for loss or damage arising out of any errors that may inadvertently be contained herein.

EN2H-2101 UK01 R1009