Issues with Aqara W600 Thermostat

Hi everyone,

i recently bought a new “heating-setup”
and having several problems with it.

Setup(latest firmware):

  • Hub: M100
  • 5× Aqara W600 thermostats
  • 3× Aqara W100 temperature sensors
  • 1× Aqara Temperature & Humidity sensor.

Thermostats are used in every room (living room, bathroom, bedroom, kitchen and office).
All devices in Zigbee mode, each thermostat is connected with a external sensor (except the bathroom, as it is very small)

First: Target vs. Actual Temperature
There are pets in the living room, so keeping a stable temperature (22 °C) is very important.

At night, the living room door is also closed, so there should be little air exchange with other rooms.

Target (Setpoint): 22 °C
Devices: Aqara W600 + Aqara W100

W600 (Offset -1 °C):
01:40 - 23 °C
01:57 - 22 °C
02:26 - 21 °C
03:36–04:15 - 20 °C

W100:
01:48 - 22.3 °C
03:04 - 20.8 °C
03:49 - 20.3 °C (–2 °C in about 2 hours)
04:52 - 22.3 °C

So even though the target is set to 22 °C, the room drops down to about 20 °C for a longer period during the night. I would expect the thermostat to keep it much closer to the target, especially in a closed room.

Second: Schedule Problem (Bathroom)

Device: W600 (Offset 0 °C)

Configured schedule (target temperature):
23:00–06:00 - 17 °C
06:00–08:00 - 20 °C
08:00–21:45 - 17 °C
21:45–23:00 - 20 °C

Actual behavior:
Between 06:00–08:00, the thermostat stays at 18 °C, not 20 °C.

Third: Open Window Detection (very strict?)

According to Aqara’s own description, the open window detection is only triggered if the temperature drops by 3 °C within 5 minutes. This is almost impossible to reach in my opinion, even with fully opened windows so maybe this is a design issue.

Scenario: airing out bedroom and kitchen for 30 minutes, windows and doors completely open, opposite sides (cross ventilation), outside temperature around 3–4 °C.

Bedroom:
Devices: W600 (Offset -1 °C) + Temperature/Humidity Sensor

08:01 - 17.3 °C
08:28 - 16.6 °C (–0.7 / –0.9 °C in ~30 min)

Both W600 and the sensor show almost identical values.

Kitchen
Devices: W600 (Offset -2 °C) + W100

W600 temperature:
08:10 - 16.5 °C
08:24 - 15.5 °C (–1 °C in ~15 min)

W100 temperature:
07:47 - 18.7 °C
07:55 - 18.2 °C
08:30 - 17.7 °C (–1 °C over ~45 min / –0.5 °C over ~30 min)

W100 humidity:
08:05 - 56.7 %
08:18 - 50.6 % (–6.1 % in ~15 min)

I think there should be more options/adjustable settings in the window open detection.

5 Likes

Thank you for your feedback. As shown in your table, could you kindly try adjusting the device compensation value to minus 2.5 degrees Celsius? This will be more conducive to temperature control in your room.

2 Likes

Hello there,

as suggested, I have adjusted the compensation value in the living room from -1 °C to -2.5 °C and will monitor the behaviour again today.

In the bathroom, following the recommendation from Aqara support, I changed the offset from 0 °C to -0.5 °C, and I also increased the scheduled temperature from 20 °C to 21 °C.

This morning I observed the following values:
05:49 – 18.5 °C
06:08 – 18.5 °C
06:45 – 20.0 °C
07:30 – 21.0 °C

It therefore took around 1.5 hours to reach the target temperature, which feels a bit long to me considering that this is a very small room. I will check this again with an external sensor to verify the readings and I might also try -2.5 °C there as well.

1 Like

Update after further testing

In the living room (W600 with -2.5 °C compensation), I was able to observe the following values last night, measured with the W100 sensor:

21:25 = 21.8 °C
22:51 = 22.3 °C
23:10 – 00:18 = 23.4 °C
01:01 – 01:44 = 23.9 °C
01:54 – 03:07 = 24.4 °C
04:10 = 23.9 °C
05:20 = 22.3 °C
06:01 = 21.8 °C

Overall, the behaviour looks better than before.
However, it seems like to go in the other way (overshot) now, even though the temperature stayed around ~22 °C for a while, the thermostat later heated up to 23.0–24.0 °C, and then even 24.5 °C for a longer period without any change in setpoint.

As a next step, I will compare the current behaviour in the living room with my previous (old) thermostats, to see whether this is specific to the Aqara regulation or related to the heating system itself.

Bathroom – schedule issue + external sensor verification

Yesterday I also encountered a new issue:
The scheduled temperature (21:45 – 23:00 = 21 °C) did not activate.
At 22:00 it still showed 17 °C in the app, and only after switching to manual mode and then back to schedule mode did it recognise the correct setpoint.

I also checked the temperature with an external sensor, and it confirms the data from the W600:

Schedule 06:00 – 08:00 = 21 °C

06:00 = 18.6 °C
06:24 = 19.1 °C
06:45 = 19.5 °C
07:33 = 20.0 °C (1.5 hours for +1.4 °C)
07:46 = 20.5 °C
07:56 = 21.0 °C (30 minutes for +1 °C – doors closed)

Is such a “slow” temperature increase, especially in a very small room considered normal behaviour for the W600?


We will release an optimized version of the temperature control algorithm next week. Additionally, I wish you and your family a wonderful day.

3 Likes

Thank you very much for your reply and information.
I will wait for the update and check everything again afterwards.

In the meantime, I have two more technical question regarding the regulation of the W600:

  • Does the W600 thermostat improve its behaviour over time (learning or adaptive control), or is the temperature regulation more static?
  • Does the thermostat only operate in fully open / fully closed states or is there a variable / proportional control available (e.g. 30%, 50%, 70% valve opening)?

I have read that currently only work with open/closed. If this is true, will it remain this way, or could proportional control possibly be implemented via firmware update in the future?

Have a wonderful day too :slight_smile:

3 Likes

Hey @janni1122,

did you updated to the latest firmware and checked everything again afterwards?

It would be nice to hear if problems get resolved or not.

1 Like

Hey there,

i actually bought and tested different thermostats around Black Friday. Unfortunately, they performed significantly better in my tests.
Since I only had the 14-day return window for the other thermostats, and the promised update from Aqara unfortunately didn’t arrived until then, I decided to keep the other ones and return my Aqara setup.

I think, Aqara still needs quite some time until everything works smoothly and reliably.
That’s why I chose to go with a different solution for now.

1 Like