Hi all. I’m testing the IKEA VALLHORN since few day.
The pairing seem to be pretty easy (set in HA pairing mode and press for time on pairing button of the VALLHORN). Devices were detected and are working … until I reboot my HA instance.
From this instant, my WALLHORN are no more reporting any event.
That was the same for the PARASOLL I’ve added.
Any idea regarding this problem ?
Any idea on a potential solution ?
Regards.
JB
To save others who (like me) didn’t know what an IKEA Vallhorn is…
My guess is like many other IKEA Zigbee products, IKEA have “extended” the protocol for their own ends (like local and direct pairing to a device), and whichever Zigbee stack / Add-On you are using will need a “quirks file” to make the device function like any other Zigbee sensor. There are also blueprints for some other IKEA devices.
Which Zigbee stack are you using, and have you checked if they have a quirks file (or a blueprint) for the Vallhorn?
(searching here shows deConz from 2024-01 which suggests others like ZHA might be at least working on it - check GitHub perhaps?).
Here’s a previous worked example fopr ZHA…
If this helps, 
this post!
Also, make sure you use the right batteries: apparently this device is critical about it.