Z-Wave Interference: ZWA-2 Controller triggering PIR Presence Sensor

Configuration Z-Wave
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I detected a funny side effect after installing the new ZWA-2. Every time a command is send to a Z-Wave device my PIR sensor is triggered. It is a pretty old school one and just switches on a light in the hallway. It is a older version of that device from revolt: revolt Sensor Steckdose, Zwischenstecker Bewegungsmelder (german). The controller and the sensor are in the same room.

The technology behind it is explained here: Passive infrared sensor - Wikipedia

Since it is pretty annoying that my light switches off and on a lot during the day and the night I want to ask for advice. I tried moving the controller to another room, but it is still triggering.

Additionally can someone explain why this is happening? I thought IR frequencies are nowhere near the Z-Wave frequencies?

2

Maybe time to replace PIR

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hmm do you have a shelly wave device connected to the light? they have a bug that is fixed in latest beta 14.99, in 11.10 when including devices they rebooted, in firmware 13 thay go offline. in shelly its the kernel, so if you do not have a shelly connected, check the kernel on the relay turning on the light. or do i misunderstand and this is a standard pir sensor that is affected by z-wave? or do you maybe have a relay controlling the power to the ir,

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No shelly is involved there, no. It just a sensor directly connected to the plug. So nothing smart at all :innocent:

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Sounds like RF interference with the sensors electronics.

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hmm then it should be highly unlikely, ir is normally triggered by temperature differences in the sensors zon, it can be trickt to trigger if you have light flashing/blinking and for exempel you have glass or mirror in front off the sensor, do you have a mirror or glass that is reflecting the zwa2 light? to try this just use som electrick tejp and tejp a part of the sensor to see if it stops to trigger.

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Update: The only thing that helped, was moving the ZWA-2 even further away from the PIR sensor in another room.

My first test was in the neighboring room, which had a milky glass door. When the controller was too close to the door, it still triggered. Moving it to the end of the room helped.

The controller is now in a different room and about 5m away from the sensor. Now no triggering is happening anymore.

So no real cause was found, but it works now as expected. Thanks for all your input.