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Good question.Oooosshh. How many copper pipes do you have coming from the boiler itself?
Discuss Impossible to fix flow problem? 4 grand down so far... in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Good question.Oooosshh. How many copper pipes do you have coming from the boiler itself?
I think that's the least of his worries.no bypass ?
22mm equal tee before the pump what is that for ?
That's probably to be the condensate drain.connections at the bottom of the boiler from memory just one, plastic pipe?
Sounds like the original powerflush was done after the new boiler was installed, if it's suspected that the powerflush drove muck into the h/ex. But I'm still puzzled why the flow was low enough to give those symptoms with the original boiler. I don't think we can rule out yet the blockage being elsewhere in the system.His suggestion, get the boiler powerflushed, or just heat exchanger removed and cleaned fully.
Have you checked pump valves are both fully open. Very basic suggestion but could be a knackered pump valve??
Thinking about this again, it seems odd that everything heated up during powerflush (your #6) but not otherwise. I suppose a powerflush pump has more umph than a heating pump, but still strange. Is it possible there's a spring-loaded valve somewhere in the system?Already listed the costs, was just after some advice from some kind people. Gratefully received. Let's leave this here. Thanks again everyone for the things to try etc.
For the record I can't do any plumbing myself and wouldn't try.
It appears that the Viessmann "expert" doesn't understand either.I don't understand thatthe circulation is not good, although the boiler is looking for 20 deg differential between flow and return rather than measuring flow rate I think.
SOUNDI would Scrap the old flow and return and start again.
Reply to Impossible to fix flow problem? 4 grand down so far... in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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