oventrop R-Tronic RT B Installation And Operating Instructions Manual page 23

Installation and initial operation
NOTE of an unsuccessful "teach in" process
If you do not succeed in pressing the "teach in"/adjustment button of the actuator within
the 30 seconds countdown (countdown expired before, no radio signal), TEACH IN
will be displayed again. The "teach in" process may be repeated now.
The "teach in" process may also fail if the radio communication is interrupted by
spatial factors, such as room geometry, existing objects, materials and interference
sources (see paragraph 4.1).
In this case, the "R-Tronic" should be installed at a different location and the
"teach in" process should be repeated.
If you do not use further actuators, switch from the submenu TEACH IN to the default
view displaying the current room temperature. Keep the return-button of the
"R-Tronic" pressed for about 3 seconds.
The following display will appear:
Warning symbol
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(Illustr. 15)
Return-button
(Illustr. 16)