I like the W600 and was happy using it, so I’m sorry to have to report this.
Short version: two of my W600s had this fault straight out of the box — the motor ran non-stop and the pin never moved, before the units had been used at all. Both went back to the seller. Now a third unit has developed exactly the same fault after two weeks. Since two units were already like this when new, I don’t believe this has anything to do with how the valve is used.
Setup: W600 on Zigbee, Hub M3, firmware 0.0.0_2848.
What happened with the third unit
- The unit worked normally for two weeks: it opened and closed on command and reported its valve position.
- Then, from one moment to the next, it stopped responding mechanically. The last thing it did was follow a few ordinary setpoint changes (open → close → open within about two minutes).
- The motor runs, but the pin (plunger) does not move.
- The reported valve position has been frozen at 100 % since then. The unit is still online, still reports its temperature and still accepts setpoint changes — only the mechanical movement and the position report are missing.
- Valve calibration from the app never finishes. With the unit taken off the radiator: F1 → press 3× → F2, the motor keeps running and the plunger does not move.
- There is no physical damage. The unit was mounted on the radiator in a protected corner of the room.
What I tried: repeating the close command many times, setting 30 °C manually in the Aqara app, valve calibration from the app, removing and re-adding the device, starting the calibration by hand off the radiator. Nothing changed.
Why I’m posting
Three units with the identical symptom — two of them brand new — looks like a hardware weakness to me, not a one-off. I still have two more W600s in daily use and I’m worried they will go the same way. An E1 on the same hub has been working without problems.
Questions
- Has anyone else had a W600 fail like this after days or weeks of normal use — motor audible, pin not moving?
- @AqaraOfficial — is this a known mechanical issue (gear or coupling between motor and plunger)?
- Is there anything left to try besides replacing the unit?
Possibly related: W600 killing itself in the middle of the night and stuck on “F2” calibration loop.