What do the different RF LED states on the receiver mean?
The RF LED flashes RED during the first 5 seconds of power up, then turns solid RED after 5 seconds. It shows GREEN when an RF signal is received, and turns solid RED again if no RF signal has been received within the last 25 minutes. During manual override with RF receive active, the LED flashes ORANGE. (Page 7)
From the official Siemens Rdh100rfset Wireless Room Thermostat With Lcd manual, page 7
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