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So there is a depression in the case ? Could it also be the flue that is partially clogged ?

To be honest I don't know but I wouldn't take the risk to touch it myself. I'm pretty sure this is not the damp air because it always happen, even if the humidity is low outside (RH 50%). There are also very light black traces on the front panel (like soot?), when I clean it to remove water. So...

Thank you for your answer. I'm leaving the front panel opened after use and only a professional has operating the flue. If I don't open the front panel, the condensation inside will become more and more significant and leak from the bottom of the boiler after some days (small drops of water but...

Hello everyone, I have an issue with my gas condensing boiler and so far I didn't find someone who was able to found out the issue... It's a Saunier Duval Thema Plus Condens, a french model that is 9 years old. The problem is that some condensation appears inside the boiler after use. It can...