Sonoff TRVZB - Valve closing degree issue

Configuration Zigbee
1

I recently installed two Sonoff TRVZB valves, first over ZHA and later over Zigbee2MQTT.

It was firmware 1.2.1, now 1.3.0…

I was wondering why both valves were either completely closed or completely open, when controlled over HA.

In both cases the valves were indeed only on two positions, which became more visible when you unmount it.

So i went through forums looking for calibration, seeing that people found the same problem, and worked around it as if the valve is like a binary switch.

I was just reading through Zigbee2MQTT documentation to realize that default value for ‘Valve closing degree’ was 3%.

At first i thought of this value that the valve isnt closing to less than 3% of actual capacity, leaving at least some flow, but i realized that this specific value means that its not closing to less than 97% (read the doc if you have to, consider the value of “inverted” towards Valve opening degree)

Eg. by default the valve can be either closed / Off or be set to 97-100% capacity.

Can someone please set ‘Valve closing degree’ to 97% in Zigbee2MQTT config and verify if the valve isnt operating “binary-like”?

1 Like
2

Hi, I think the TRVZB can only operate in binary.
The default 3% worked for me exactly like 97% but reading it in the documentation suggest the right way should be 97%.

One more thing: for the TRVZB there is no way to see the actual valve degree so there is no way to verify it.

3

Welcome to the forum.

Did some reading on the topic. Theway how TRVZB operates might be beneficial to the radiators. Faster flow may flush away any debris inside.