On the S4000, the yellow LED on the motor unit and/or terminal indicates that a safety check is due.
The testing interval is a maximum of 12 months.
In case of highly frequented passages or sensitive use, this maintenance interval must be shortened
According to DIN EN 18650-2, power-operated windows, doors and gates must be checked for their safe condition by an expert before they are put into operation for the first time and at least once a year.