Secure SCS311 Installation Instructions Manual page 16

Resetting the SCS311 / SCS317
Electronic equipment can in some circumstances be affected by
electrical interference.
If the display becomes frozen or scrambled simply press both
the BACK and ENTER button simultaneously.
Using this procedure will restore the SCS311 / SCS317 to the
original factory settings, the Time and date will remain correct.
BACK ENTER
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