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ZWA021 Thermostatic valves weird behaviour

Posted: 19 Jan 2021 17:41
by kajman

I have 6 valves in my home 4 of which are automated (having simple night/day temperatures set). Few times a week one of the automated valves will behave like this:
ab6f9f548fa65c863d4588e62b3bb43fca2c327d_2_345x750.jpeg (46.18 KiB) Viewed 1527 times
Around 7:00PM I've set the temperature to 17.0C (the blue line) and it behaved correctly until around 01:00AM then suddenly the valve opened itself to max and rose to 20.0C around 7:00AM. This happens once every 1-3 days lately. I've replaced the batteries and restarted and healed the zwave network many times. As I checked the temperature on LCD at 7:00AM it was still 17.0C and this is always the case.

What helps is to set the valve on Boost and then turn Boost off after 2-3 seconds. This is another example from today: (66.83 KiB) Viewed 1527 times
Why may this be happening? Are all of the valves that behave like this faulty? What can I do to fix this?