As the Comfort Plug has a limited number of 3 "Masters" from which it will accept a command; you should erase the binding between the corresponding button on your Remote Control and the Comfort Plug. Otherwise the Comfort Plug will no longer accept new links.
Bring the Plug in Pairing mode (LED will blink) by powering it up. While the LED is blinking, press the "Off" or "0" of the corresponding button on the Remote Control. You should hear the Comfort Plug "click" twice. The link between the Remote Control and the Comfort Plug is now erased.