Are you using the same vaillant account for your app and the homey integration? Don’t do that. Create another “family” account, invite it to vaillant, then use that account for homey integration. Otherwise they may interfere with each other. That’s true for every 3rd party vaillant integration for every smart home hub.
I doubt that, since after a repair in Homey (fresh login) values appear again once…
I’m guessing that during a login you do the API call but when Homey does it again after x minutes it is blocked.
Yesterday I noticed that after logging in again via Homey it worked for about an hour or two. After that it died again.
Today only got one refresh.
Anyhow ,I’d rather have it fixed/solved then being right 
Thats not it, just created a second account, logged in with new credentials, same thing, it works for about 2 minutes, which I can see on the outside temp. value, that came twice, all other values once and then it stops. I have been using this app with just one account for quite some time and was woirking fine…
On my own setup I’m experiencing the same issue as you all.
2 days ago the api was down for 1 hour for maintenance, it looks like this is the trigger.
I see logs of invalid clients. Could be some change in the authentication of the api or refresh tokens that became invalid. Not sure yet.
It is a hobby project and a busy week, so will try my best to get it working again this weekend 
Good news, I did a little bit of digging and found out the request headers I use in the app where outdated. And some other small thins in the data I send to the api letting it think it comes from an Android app.
I’ve pushed a experimental build that works again after a repair device action (fresh login). Will test it a bit further to make this repair step obsolete.
A huge amount of gratitude for your efforts towards this app.
Let me know if you ever publish a coffee donation button
quick feedback, 2.0.1 seems to be working a little longer, many thanx, !stopped again, but only after approx. 10 minutes…
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Much appreciated Pallieter.
I restated the app and it all started working
You’re right, after a restart it starts working, but if I do a repair (relogin) it comes back with appliance not available. Lets see if values update a little longer 
Edit: seems to be running now for longer than 10 minutes, updates coming in, actually looks real good…
Mine is unavailable again, have to keep restarting the app
on 2.0.3 it was working for approx. 20 minutes, now it stopped again, getting better
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do have 2.0.7 installed, running good for approx. 20 minutes now, and “repair” is also working again…
Seems to be working now, over half an hour, getting updated values, great job, and thanx a lot
Ok, 1 day later—runs like a charm again, many thanx for this fast fix
I pushed version 2.0.7 as stable release. Your devices will show as unavailable and require a repair action. If you have multiple devices this is only needed for 1 devices. After about 2 minutes the intergration should work again
I am now running 2.0.7 but still have the same issue with the heating control
Working again! Many thanks for the quick reaction 
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The values such as power and energy used etc for my FlexoTherm were not working before and not working now. Which still is a bit strange as the Viallant Android app is giving this data as well as on the Vaillant controller. Temps and pressure are reported though.
Request: is it possible to show pressure with 1 or 2 digits behind the comma?
same here on my aroTherm 75/6 with uni tower , but energy was not show before either for whatever reason…but I mainly use it for turning on when enough pv power is available.
