TFC Group STTR/F - Manual (Page 12)

Battery installation
Your thermostat uses two ‘AA’ size
batteries to operate. To power-up
the unit, insert two ‘AA’ batteries
into the battery compartment of the
front housing. When power is
applied for the first time, the display
should show time and the day as
well as the room temperature.
Press the RESET button after
insertion of batteries (use a fine
instrument such as a straightened
paper clip to gently push the
RESET button.
After installation of the batteries,
push back the rear housing to the
control centre and then the stand.
The Transmitter is now ready to be
programmed.