Conrad Electronic FS20 S4, Руководство по эксплуатации

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If this happens, then the programming that you have carried
out will not be saved. Replace the battery and then repeat the
programming.
We recommend that you replace the battery, if the LED lights up for 3
seconds, as described above.
e) Restoring the factory settings
To reset the ‘FS20S4’ to the factory settings, proceed as follows:
• Press the
2
and
4
buttons simultaneously for approx. 5 seconds
until the control indicator/LED briefly lights up.
• With the next press of any button a new random house code is
automatically generated and saved along with the other factory settings
and the ‘FS20S4’ is reset to the factory settings. See section 8. d).