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Appareillage - A staircase switch is not working as it should. What is cause of the problem?

Cause

If the push buttons and the staircase timer are connected with a 2-wire connection, the total working current of the LEDs may be sufficiently high to have its coil be constantly activated.

Solution

Adjust the wiring to a 3-wire connection. OR Replace the LEDs with neon lamps (only in push buttons with an E10 lamp base).