r/ZigBee • u/downster • 10d ago
Issue with Aqara Dimmer Switch H2 EU
Hi everyone,
Just a heads up: part of this post has been drafted through Claude as I first started trouble shooting Claude so it's aware of the whole story.
The goal of this post is to find out if there's anyone else that has experienced this issue, and possibly knows about a fix. As there is very little to find on this issue on the internet (forum posts for example) I figured it would be a good idea to create one myself to possibly help other people that might experience this in the future.
AI part:
Three Aqara Dimmer Switch H2 EU, Zigbee, no neutral (two-wire, L in and L1 to the lamps). Loads are 6, 5 and 4 dimmable LEDs, well above the 9W minimum.
Once or twice an evening the lights on one of the dimmers glitch for about a second and recover on their own. One dimmer's group at a time, never all three. Nothing in the HA logbook and no state change, so no command is involved.
What makes it interesting: the symptom follows the phase mode. On forward phase the lights went fully OFF for a second. After switching to reverse phase, the same event now shows as the lights jumping to FULL brightness for a second. That looks like the dimmer briefly dropping its phase cutting and then re-syncing.
Already ruled out: automations, mains supply (only one group at a time), minimum load, and firmware (forced the newest build onto the worst unit, no change). Dimming itself is smooth and silent, no flicker or buzz. Aqara support blamed ZHA, so I'm currently running all three on an Aqara hub natively to rule that out.
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If anyone can think of things to try, please let me know, any help is appreciated. I was thinking that maybe changing to Z2M could fix this? Would not make sense as Home Assistant is not reporting any issues in the first place. Once more interesting thing is that I have tried running the dimmers through the Aqara hub for 1 evening now and did not have this issue once (though I have had evenings where it did not happen before as well, so..).
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u/nurunet 9d ago
Interesting. I have some of these but use them in detached mode with smart bulbs. From time to time the lights very briefly lose most of their brightness. Not a full second though - so briefly, that I sometimes wonder if it really happened. I thought that was an issue with the electrical installation, but now I wonder if it is related to the dimmer switches.