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MyVaillant Connect Regular Disconnect

 
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by buckwem 12 hours ago
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 buckwem
(@buckwem)
New Member Member
Joined: 5 months ago
Posts: 1
Topic starter 21/12/2025 12:41 am  

A couple of weeks ago the MyVaillant Controller had a red light error and now many nights around 11pm UK time it does the same. It’s a problem because Havenwise then can’t talk to it to make adjustments.

I can tell from UniFi and pinging from Home Assistant that the controller is still connected to the network.

I then installed the Home Assistant HACS extension for Vaillant and it shows the controller permanently disconnected. So I can’t detect any outage that way. I was thinking I could put switch power off/on if I could detect it’s offline. I may have to get an ebus adapter to read the controller directly.

I raised a ticket via Vaillant technical support on their website and they said raise a ticket via the app. I have done so and so far they have asked me to reconnect the controller via WiFi. I did that but it’s happened again tonight. I wonder if it happens at exactly 11pm as that would be midnight in Europe.

It’s been working for four months and it suddenly starts misbehaving. The controller is connected to a 2.4Ghz only WiFi that is set to IoT mode with a fixed IP for the controller. Havenwise has been used all this time.

Has anyone seen this before or got any ideas? I have to remember to power off/on the controller every night at the moment.



   
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