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Interesting pictures on that thread. So assuming that the BG engineer has a sonic cleaner appropriate for the main h/ex then he ought to be able to back flush and clean out the debris. BG have said they will replace the hoses at the same time so if they are starting to crumble internally then I...

H'mm allegedly that is what the BG guy is coming to do on the 6th May and as there is no plate heat exchanger in this (non combi) boiler then I might be getting very annoyed with them. The problem appeared the day after the hose shortening event and has not bee right since

Excellent ..so this sonic clean if the heat exchanger ought to sort it out then. It's happening after the bank holiday. Will let you know if it fixes the problem. Thanks for the advice.

OK thanks .. forgot to say this is a non-combi set up, so no plate exchanger in the unit just the circular stainless steel one. So a blockage in the heat exchanger could give the symptoms I am seeing, ie good pressure but no pumped flow rate. I can see from the schematics that the pump is on...

The original BG engineer cut off about 2cm from the hose and then used a new clip to secure it. There is no sign of sludge in the manga clean device so I am presuming sludge us not a problem. Perhaps the sonic clean will sort it out. Fingers crossed.

British Gas are really struggling to work out what is going on and why there is no flow around the system. The rads upstairs get slightly warm, presumably due to convection, but the hot water needs boosting with the immersion. BG have now replaced the pump, and proved that they can pressurise...

I have a Veissman Vitodens 100 boiler which has been in situ for about 10 years. I have a british gas service contract for about 7 years and at the last service they noticed a leak from one of the rubber hoses inside the boiler. I had been losing pressure over say 1 month period so was happy...