30
Symptom Possible Cause Remedy
The ST9420C screen shows
the message:
Your boiler service
is overdue and
the boiler has
been automatically
switched off to
ensure your safety.
Arrange an immediate boiler
service.
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’.
After servicing your boiler, the
Service Engineer / Installer will
reset the ST9420C to remind
you when the next boiler service
is due. Each service is normally
a maximum of 1 year apart.
ST9420C shows the
message ‘SENSOR LOW
BATT’ and a flashing radiator
symbol
Your DT92E
batteries are
running low on
power.
Change the DT92E batteries
(see page 21 for how to do
this).
DT92E shows a flashing
battery symbol
DT92E display is blank
ST9420C shows the
message ‘SENSOR LOW
BATT’ and a flashing tap
symbol
Your CS92A
batteries are
running low on
power.
Change the CS92A batteries.
This is located next to your hot
water storage tank (see page
25 for a description of how to
change the batteries).
CS92A battery low indication
(press CS92A button and
red light gives a short flash
every second 0.1s on, 0.9s
off. Note: light will switch
off after approx 1 minute to
save battery power).
FAQ AND TROUBLESHOOTING
To Next Page
Loading...
Need help?
General
