Secure SRT323 User And Installation Instructions Manual page 5

If the SRT323 is connected to a wider wireless system,
a flashing radio wave would indicate a loss of
communication. This may be temporary and can often
be restored by turning the thermostat dial and
increasing or decreasing the temperature to make the
thermostat send a temperature update to a controller.
If this has no effect please see Wireless System Setup
instructions on page 9.
The aerial symbol complete with radio
wave symbols in the display of the
SRT323 thermostat indicates that it is
wirelessly communicating with the rest of
the system.
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