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Vaillant ecoTEC Intro Combi Boiler ''f20-f23'' Error Codes
I use Vaillant ecoTEC Intro. We are in its 3rd year, and the problems start as soon as the warranty expires. The combi b...oiler 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 re