On 03/11/2018 17:50, DerbyBorn wrote:
After lots of checking a Heating Engineer has decided a mate's heating
system has a partly blocked boiler heat exchanger. Likely? 12 - 15 years
old. Has been pressure cleaned a couple of years ago.



Limescale build-up? Is the boiler kettling or making other noises.

If so a dose of boiler noise reducer or anti-kettling additive to
dissolve the limescale may be worth a cheap gamble for curing the problem.

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