Hello Fiedel, Thanks for your answer and support. The boiler has worked during three weeks after installation by a Pro Viessmann Station. A morning with no reason, fuse of the boiler has blown on my electric panel. But not all the panel or range, only the fuse of the boiler. I immediatly put it on back and the boiler restart but with error 357 since then... My Viessman station has measured gaz pressure static and that's ok. But the valve do not open at all. She seems to be alimented because she's magnetic. They first change all the piece of gaz fan including gaz valve yesterday but no sucess. They think this is a trouble of the eletronic panel (the little on the right top) who does not give the order to open to the gaz valve...and they will try to change it tomorrow...maybe there was a default on it explaining the fuse ... If you have other idea...
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