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Hi This boiler is due to be fitted to an existing system in the next two weeks. I have just read on here about a heat exchanger being blocked by sludge and crap in the pipes. What should we do as far as trying to clear the system before this happens to us. Is the acid additive and...

My neighbour is having trouble with this boiler. With my limited experience I think there is a lack of system pressure. The majority of the radiators work as expected but 2 seem to be airlocked. When bleeding the radiators the hissing air noise stops after a short while but no water comes...