Saswell T19WHB-7-RF, Operating Instruction

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that indicates the thermostat is entered to receive communication
signals. Yellow LED blink two times.
2. Code match
：
When the Control Centre is in the code match mode, Switch off
the thermostat, long press the power button for 3 second to enter
the code match mode and LED C (yellow) lit up. If the Control
Centre and receiver code match successfully, LED C (yellow)
flashes 6 times ,saves the current setting and exit automatically.
Otherwise it means not done , the thermostat will exit the menu
after 20 second and need to recode.