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Thanks for the advice. On further investigation (armed with my new knowledge - courtesy of you).... My plumber has mistakingly (ahem - being very polite) put 22ml copper pipe instead of 35 ml waste pipe outside! So even though it's insulated, it's still getting too cold and not clearing the...

I'd be really grateful for advice here. I have a Worcester Greenstar 42cdi that is just over 2 years old - Pressure is okay, pipe outside is lagged and covered. The water heating side is working okay. The central heating does not seem to come on as usual in the mornings. If I turn off...