Hi, I have an issue with the Aqara T2 relay (two channels).
Both channels work and control two separate lights. The relay is installed in the main electrical cabinet, together with other 30 Aqara T2 relays.
I connected a double wall switch:
Each key has a separate wire going to S1 and S2,
There is also one shared COM wire between the wall switch and the T2 relay.
The problem:
When I press one button, it toggles one light correctly, but after about one second, the second light also turns off (or on).
If I disconnect the S1 wire, both buttons start toggling both lights simultaneously.
It looks like S1 and S2 inputs are somehow interfering when a shared COM is used.
Do you have any idea how to solve this ? This is making me crazy ! When using Aqara app or Home App channels works prorerly and separately. The issue occurs only with the physical wall switch. Please HELP !
I had similar issues and I could only put it down in my own situation as to some kind of voltage leak somewhere I could not trace. I tried with a multi-meter but could not get it to work. I think the sensing on the S1 & S2 are very sensitive, the COM is common with the Live in on the relay and therefore is detecting a voltage of 240v but as you say it’s messing with the other channel.
In the end I decided to the there H1 wireless switch instead of a physical switch and do the automations from the H1 wireless switch.
I has an advantage of having a quick mode and multi mode for more functionality.
This is not what you want to hear but was my solution.
Hello, if I were you, I would temporarily connect the switch wires (S1,S2,COM) directly near the main electrical cabinet. I tested the operation with direct control.
This is a large house and some of the cables may be 20–30 meters long. It’s quite an complicated installation, so replacing the cables or applying any major modifications isn’t an option.
Is there any way to filter out interference — for example, using filters or capacitors?
I suppose that with such a test everything will work fine. I believe the issue is related to the length of the S1, S2, and COM cables running from the module to the physical switches. Not all of them, but some switches go crazy — there’s some interference that I need to sort out, even though the cables are not shielded. Looking for a filtering solution.
Hello, I suggested you do this to rule out a relay fault. Then continue looking for the fault (I agree with you and understand that it could be a power supply issue).
I managed to resolve the situation, but it cost me a huge amount of work — around 85 man-hours. All T2 switches were moved from the main distribution board to wall boxes, and the circuits were rearranged. This solved the issue, however I am still not satisfied with the delay with which the T2 switch opens/closes the channel when using the physical switches connected to S1 and S2.
The delay is significant and makes normal use of the light switches difficult. For comparison, I also have several Aqara Single Channel T1 switches, and those relays do not have this delay at all.
Is anyone else struggling with this delay and has found a solution?