You guys give more sensible and knowledgeable advice than any plumber I can find in this area!
This forum has been a real eyeopener and I have learnt so much from you all.
But, you are right, probably best not to say I've been looking on the internet. That must be so annoying!!
It might be dirt that has been circulated to somewhere where it has built up and partially blocked somewhere. That could be anywhere, not just in the boiler. As you imply it was OK at first then that sounds likely.
Or it could be dirt in the pump or a valve is not fully open.
Lots of possibilities but all made worse because ther boiler seems far too large for the use.
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