Hello everyone, I am using the Sonoff TRVZB for my home heating setup. Generally, it works well for my purposes - however temperature was relatively far off. Therefore, I looked into calibrating it.
There are two methods for doing this:
Calibration using ZHA Toolkit (independent of integration within Home Assistant UI). The main benefit of this method is that offsets >2.5°C can be defined.
Problem is, that I am using the ZHA integration, which at the moment does not include calibration features for most TRVs in general. See this github issue for more on this topic. But, calibration is definitely possible. It is possible in the official Sonoff app as well as through the Zigbee cluster “local_temperature_calibration”.
Well, here’s how to do that:
- I assume, you already have the TRV connected
- Install zha_toolkit from HACS
- Enable zha_toolkit by putting a line into your configuration.yaml:
zha_toolkit:
- Restart Home Assistant
- Go to your developer tools → services page
- Select the zha_toolkit.execute service, and for easier input switch to YAML mode
- Enter this code:
service: zha_toolkit.execute
data:
command: attr_write
ieee: climate.your_sonoff_trv_device_name_here
attribute: 0x0010
cluster: 0x0201
endpoint: 1
attr_val: -20
- The last value is the important one. It is the calibration amount. Be aware that it’s 10 times the amount you want. Therefore, my example -20 is equal to a calibration of -2.0 °C.
- Check the answer by the device is the output what you expect. You should see your value under result_read:
warnings:
- "Read does not match expected: -20 <> '-20'"
result_read:
- "16": -20
- {}
- Done. As you can see, the reported answer matches the input. We can ignore the warning, since apparently it checks text against an integer.
Looking into the specific device information and looking for local_temperature_calibration, you might be able to find the attribute and cluster IDs which can be used on other TRVs as well. As far as my knowledge goes, this value seems to be standardized. However, I can only confirm these specific to the Sonoff TRVZB.
If you have success with other devices, let everyone know and I’ll update the title.
