Zigbee Thermostats for electrical floor heating give me a headache.
Used Moes for some time but they spam the network.
Now I decided to give the Aqara W500 (UT-A01E) a try. Initial setup disappointing as forced to register with Aqara to choose Zigbee over Thread - anyway got that done and it seems to work ok.
One thing I realized is that when I use the NTC sensor it is not receiving a constant value but keeps changing every 5-10 Seconds in the range of 0.2-0.5 degrees Celsius. Could any body confirm a similar behavior?
I have the same issue, but more extreme. Do you use zigbee2mqtt or ZHA?
To control the heating reliably I set the hysteresis to 1,5°C which helps, but is not really cool.
Same here - it’s stable when you remove the NTC cable and uses the room temperature. BTW I didn’t register with Aqara but straight after factory reset paired it in HomeKit and afterwards connected it to HA. I’m thinking about doing that again with the NTC cable attached - maybe it configures differently but it’s a wild guess.
Bought new device, tested it on the table with external sensor for a few days - all fine, readings stable. Then installed it on the wall, behaviour changed as you described above.
Just got another w500, connected everything on the table again - works just fine with NTC enabled. Keep testing…
I have 3 of these installed (and 1 still in it’s box). I have the same issue, the severity varies, the worst is a 3 degree difference, as you can see in the chart.
In all 3 cases, I’m using the previously installed sensor, not the the on that came with the W500. I think this is the root cause of the issue. (I’ve not gone as far as investigating swapping the sensor yet - not sure how easy the conduit will be to access.)
I’ve been led to believe my old sensors are 12K or 15Kohm sensors, which the W500 doesn’t have a setting for. I suspect that’s the cause of the issue.
Note that one of these sensors is hooked up to a Aqara M100 hub, and exposed to HA via Matter (as a comparative test). I see the same issue there, so I don’t think the ZHA Zigbee support is the issue.
FWIW, the yellow and red charts are readings from old warmup.co.uk thermostat sensors, the blue one using far less variation is reusing a sensor from a Heatmap thermostat. Manually measuring the yellow sensor earlier showed 14Kohms at approx 20C.
I’m not going to pull the floors up to replace the sensor. So I guess my options are (1) hope the sensor is in conduit and can be replaced, or (2) find some kind of software solution. If ZHA could expose an average over maybe the last 4 or 5 readings, it’d probably go a long way to helping.
after few tests I came to the same conclusion - this has something to do with the external sensor circuit, somehow under some conditions it becomes either too sensitive or gets disturbance from somewhere. However I have used 10k NTCs only. Anyone to try 50k or 100k sensors?
When i first connected it using Thread, I “think” it choose correct Ohm, but then I upgraded the firmware to latest 1.0.3.0 and it started showing -23C (ie incorrect NTC config.
Also, z2m doesn’t seem to show any energy reading…
Edit: Changed back to thread and ntc is flapping between -22 and -20 ish…
