I use Vaillant ecoTEC Intro. We are in its 3rd year, and the problems start as soon as the warranty expires. The combi boiler was leaking water, its pressure was constantly dropping. They said the heat exchanger would be changed, they paid 3400 TL and replaced it, and there was no problem in that regard. I told my friends who came that the bath water constantly gets cold and hot, sometimes it gets cold and not even hot. They said they changed this, and it would be fine, and left without looking at anything else. Less than a week later, half of the radiators started not heating up, and I started getting f23-f20 errors, which couldn't be fixed without a reset. We called the service again; the people who came were different. There was a small filter; he said it was dirty and clogged, he cleaned it, and the problem went away! And the friend who came before him could not change the heat exchanger without removing this filter, so I understood that he did not clean this dirt even though he saw it. I said, the water in the bathroom is getting colder and warmer, and he said it will pass. The other day, I took a shower, and guess what, yes, while I was soapy, the water started to get cold and warm, so I quickly rinsed and got out. I am currently in the 3rd week after the first repair, and half of the radiators are cold again. Yesterday I checked it and it gives an error of f20 - today it gives an error of f23. You reset it and it gets better, but half of the radiators are cold now. You make mistakes at night and usually wake up cold in the morning. I looked on the internet, and the first place to look is sensors, but none of those who have come so far have looked at that. Everyone who comes says "this is here" and does something and leaves. It doesn't last a week. I will call again tomorrow. If you don't have an employee who knows how to do this job properly, I can learn by looking on the internet and get a job. At least I don't have to invite myself to the same place 3 times in 3 weeks. I am writing from Turkey.
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