To sync the RDH10 (thermostat) you must first set the RCR10 (receiver) in learn mode, this is normally located next to the boiler, this is done by using a small pen or similar to press the learn button on the front of the panel.
Once pressed the top light on the RCR10 will stop flashing, now on RDH10 look at the rear and press the Learn button but for 3 seconds, after about 20 seconds the RDH10 should then sync with the receiver.
Please follow the process above, and let me know how you get on.
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