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Symptom Possible Cause Remedy
ST9520C shows the
message ‘NO SIGNAL’ and
a flashing radiator symbol
for one of the zones
DT92E shows a flashing RF
symbol
Your DT92E
batteries are
running low on
power.
Change the DT92E batteries
(see page 21 for how to do this).
RF communication
path between
ST9520C and
DT92E is blocked,
possibly by a metal
object.
Check direct path between both
products and re-position any
objects that may be blocking
the signal.
Relocate the DT92E, if possible.
ST9520C shows the
message ‘NO SIGNAL’ and
a flashing flame symbol
Red light on BDR91T (if
installed) is lit continuously.
RF communication
path between
ST9520C and
BDR91T is blocked,
possibly by a metal
object.
Check direct path between both
product and re-position any
objects that may be blocking
the signal.
ST9520C shows the
message ‘SENSOR FAULT’
and a flashing radiator
symbol
DT92E display shows ‘
’ and a flashing spanner
symbol
Fault with DT92E Call Installer
ST9520C shows the message
‘OPENTHERM FAULT’
Fault with the
Opentherm boiler.
Enter Enquiry Mode as
described on page 14, use
the
or buttons to scroll
round to a display that says
‘OPENTHERM’.
A fault code may be shown on
the main display. Refer to the
Boiler manufacturer’s instructions
for the required action.
If the display shows -- -- this
means there is a break in the
OpenTherm wiring between the
ST9520C and the boiler.
If in doubt, call your Installer.
The Opentherm
wiring is broken or
disconnected.
or
Opentherm has
been configured but
the wiring has not
been connected.
FAQ AND TROUBLESHOOTING
30


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