Recent content by Dr911t

Never Viessmann's fault ... ;) I'm pretty sure the installer didn't use well water lol

Do you have an external pump to circulate water around your central heating radiators or just use the internal circulation pump? Do you know what your flow rate is?

Ended up getting the right connectors and flushed the loops one by one. Worked out pretty good in the end.

Any ideas what I should do at this point? * find yet another Viessmann service partner to come and look and pay the call out fee to get an additional opinion * agree to replace the heat exchanger and hoses €1200+... and pray it's the actual problem as "no return policy on the HX" and if that...

Do you know which exact Adey filter version you are refering to that also traps particular matter? I tried and most of the flakes and dirt in my system were not magnetic. Not much metal except stainless steel exchanger, copper pipes, brass manifold and PERT-AL oxygen resistant plastic floor...

Wow that's crazy.... what's causing this? oxygen entering from the hoses? What kind of filter do you have? How does the boiler behave for you when the hoses are clogged up? Temp on the boiler goes up 'too high', short cycles on lower heating settings (<4) and low circulation through the central...

Just wondering if there are any issues with adding water to a UFH via the boiler filling loop… reason being wanting to flush out some gunk from a loop and ventilate but don’t have access at the moment to proper hose connection adapter so I can plug mains water at the manifold. Was thinking to...

Is it the combustion or the oxygen in the water reacting with the parts/stainless steel that causes this in a closed system? We do not have any radiators, just underfloor heating plastic pipes, copper pipes for flow/return and I figure the manifold is brass. PS. @snb there's a hose at the back...

The amount of issues on that Viessmann Community forum is something else. I'm sure they sell a lot of boilers so normally they will have eventually a large absolute number of issues.

My post as well there to get some more ideas, however I had also found quite a few vids about this issue. What's shocking to me is that I had 3 "authorized by Viessmann" from the official Viessmann service provider list people over and NONE of them mentioned anything about this. But they did...

I'd ask the Viessmann tech to have the boiler and UFH loops drained and the hoses replaced and then flushed with fresh water then maybe add inhibitor but apparently Viessmann doesn't recommend inhibitors. Don't have any rads. Would a filter not be necessary after to pick up any remaining flakes...

My Viessmann problems started after a service. Hoses not replaced but found tons of flakes in plate exchanger and in heating water. Is this a common issue on the Viessmanns? Mine is 5y old. I'm thinking those circulating flakes are causing pump noise, blockages and restricted flow... UFH pipes...

Sorry to resurect this old thread but @simond did you ever figure out what is the black crusty stuff in the inside of the hoses of the Viessmanns 100? I have one of these and those flakes are causing hell. Are they magnetite? Would a magnetic filter on the return help?

They ran for 2h a Rothenberger pump with acid through the flow/return of the boiler.. quite a bit of yellowish limescale came out. Thing had crazy pressure. I can't imagine anything else being left in the heat exchanger or boiler after that.... but apparently still calcified. Viessmann said...

New to gas boilers, lived in warmer climate before. It's what the builder suggested, did some research and they were quoted as high quality, long lasting boilers. It's running at 1.5 bar warm now, doesn't reach 2 after the latest flush. Guess the previous techs left it too high, nice. Paying for...