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Buderus GB142-30 corrosion Problems
I installed a Buderus GB142 about six years ago. It ran perfectly for the first two years and then the problems started. Long story short (as possible) I first had problems with the heat exchanger getting an accumulation of a crust that looks like grey lava which plugged it up. Since then there have been several calls for problems that all seem to be related to condensation. Today I got a 6L code. I reset the boiler and it fired right up. Later my wife discovered a "leak" which ended up being from the trap on the exhaust stack. I took that apart and it was full of a fine black grainy material. I cleaned and flushed this out and reset the boiler again. Then I got a 6A fault code so I called my tech. When he got here he discovered that the burner was plugged with "corrosion". He cleaned it and all seems well for now. Years ago when this first started we thought maybe the intake and exhaust were too close together so I then installed a taller exhaust stack. It is about 10' tall and outside the building. I asked my tech of that was too much and he said that he felt that the drain for the exhaust would handle any amount of condensate the could be generated by the unit, but I'm thinking I went the wrong way and should have re-routed the exhaust off to one side and slanted down to get rid of as much condensate as possible. Another thought we had was that the black/grey material might be particulate from neighboring wood stove. So.....................any thoughts on this would be welcome.