Bticino HC4657M4 Notice D'emploi page 18

Touch Controls
How to clean your control
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In order to clean the device, it is possible to temporarily disconnect the
sensitive areas by simultaneously pressing two end areas diagonally
(see picture).
The LEDs begin to flash sequentially; it is now possible to use a cloth on the
surface of the control without sending any command to the system.
Normal functioning is restored after 10 seconds if nothing is touched.
Do not clean with solvents, thinners etc. or abrasive products.
Only use the cloth supplied.
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