Honeywell ST9420C User Manual

19
Shut-down
If your ST9420C 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
OPERATING YOUR DT92E
Inquiring about the Set Temperature
DT92E normally displays the
measured room temperature.
To inquire about the set
temperature, simply press
one of the
or buttons.
The set temperature will be
shown on the display along
with the arrow symbols,
and the temperature will be
flashing.
Adjusting the Set Temperature
The set temperature is
adjusted by pressing the
or buttons. Each time one
of the buttons is pressed, the
set temperature will change
by 0.5°C.
=
°C
=
°C

Honeywell ST9420C Specifications

General

Model	ST9420C
Category	Thermostat
Display	LCD
Channels	2
Power Supply	230V AC
Mounting	Wall-mounted
Contact Voltage	230V AC
Contact Current	3A resistive, 1A inductive
Switching Type	SPDT
Type	Programmer
Programs	7-day programming
Compatibility	Compatible with most heating systems