After selecting the PAIR Menu, PAIR
and the RF icon are displayed.
Press the OK key to start sending the RF address code to the receiver.
The ST621TX display will change to show a rundown timer:
The unit counts down for a period of 10 minutes, with the RF Signal indicator flashing while
the signal is being transmitted. The RF address code will be generated randomly and the
thermostat will transmit the signal every second for the full 10 minutes until:
• The Arrow key is pressed to return to the previous display
• The OK key is pressed to return to NORMAL mode
• The 10 minute timer runs out
Note that the receiver must be already in learning mode BEFORE attempting to access the
PAIR menu. If the Red LED changed state after 10 minutes, repeat the whole pairing process.
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ST621TX INSTRUCTION MANUAL