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As far as I researched, All the new gen official Vaillant devices don't support my very old (~2005) boiler. There seems to be a new standard for Vaillant remotes

Ok, so to close the thread, I want to thank @Jurassicspark (huge kudos to you!) and @cross thread for your contributions. I concluded the thermostat receiver is not working properly. After doing the bridge, and willing to add a manual control to it, I remembered I had a never used wifi switch...

At the moment my best guess is that the receiver is not working properly (bc I tried operating it manually with the remote off, and it didn't work). So when I did the bridge between 3-4, I disconnected the receiver, because it was generating the malfunction of the system. Now heating works but...

Yes! It worked!! Before your messages I didn't have the courage to open the electric board of the boiler You are awesome! Now, can you please help me figure out: 1. What thermostat should I buy? (Considering my boiler has 3 cables for it, and most new boilers only have 2) Ideally a wifi one...

This is the wiring. 3,4,5 are coming from the receiver of the thermostat VRT240f

The only valves I'm aware of are those of input/output of the heating system water (those at the two sides of the picture). These were not touched before/after the problem

No. It is a combi boiler without a cylinder

Thanks @Jurassicspark . 2 follow up questions: 1. Is there a way to remove the thermostat without bridging 3 and 4? (I'd love to find a fix that doesn't involve opening the boiler) 2. Does this problem with the thermostat have anything to do with the fact that I've been out of home for 3...

Hi Friends, I have a problem with my boiler that I've been unable to solve in the last 3hs. I hope you can help me. My setup: Family house, with Vaillant Turbotec Plus boiler + one VRT 230 thermostat Context: It's winter (with temperatures between -1 and 11ºC in the last week). I've been far...