Motion detector does not react

If a motion detector does not react, this can have many causes. Below we have listed the most common errors that cause a motion detector to not respond.

Possible causes that the motion detector does not respond

First of all, it is important when the motion detector has been installed. Is it a new installation that does not work, or is it a motion detector that has been in use for some time, but suddenly stops working? So there may be different reasons why a motion detector stops responding:

  • Consumer defective
  • Damage to the motion detector
  • Detector set incorrectly or insufficiently
  • faulty electrical installation

Of course, depending on whether it's a new or existing installation, it's a bit different. If the light source or the other consumer is checked, it would be useful to measure the voltage that arrives at the detector. In addition, whether the circuit works properly when moving.

Defect on the motion detector

With older motion detectors installed outdoors and perhaps even in the sun, the detector's lens may become cloudy and porous. This lens consists (with infrared detectors) of many small lenses. Even a milky lens can be responsible for the fact that the motion detector does not recognize anything.

Check the setting of the motion detector

If there is no error here, the setting of the detector should be checked. This is especially true for new installations. Depending on the device, different functions that influence the circuit can be present on the motion detector. Often the height of the motion detector is incorrect or it does not respond because it has not been set sensitive enough.

Of course, especially with a new installation, it may also be that the motion detector has been connected incorrectly. Especially in old houses, for example, the color assignment does not have to comply with the standards (phase L black or brown, neutral N blue, protective earth PE yellow-green). Therefore, the phase should always be determined with a meter before connection.

Other causes that the motion detector does not respond

However, just as trivial causes can be decisive that the motion detector no longer works. In recent years, more and more consumers are replacing traditional light bulbs with LEDs. The voltage requirement of LEDs differs significantly. In addition, a switch upstream of the motion detector must be switched in such a way that phase L is switched.

Motion detectors can also forward some residual current. An LED would react even then. Either a conventional illuminant must then be used again or the previous detector must be replaced by a motion detector with a relay circuit.

Tips & Tricks

The connection of a motion detector should only be made by a trained specialist. There is a risk of short circuits and cable fire in case of faulty installation. In addition, working on the 230-volt network is life-threatening.

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