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I've got a microbore system too - doesn't it just suck?! One of the two radiator in my living room is a real pain to get to heat up... I had an engineer in once to service the boiler and when asked about it he shut down all of the radiators in the house except the problem one and it heated...

Thanks for all of your replies..it's much appreciated! The situation at the moment is this... Thermocouple now keeps the pilot lit! Hot water is good Radiators...well they could be hotter, but at least they aren't cold! One things for sure, the flow rate of water through the boiler...

Could it be as simple as an air lock in the system?

Well, I've now fitted a new replacement pump (quite straight forward really) and a new thermocouple (easy to fit)... ..but we have the same problem! When the pilot light stays lit, the boiler produces loud cracks and bangs as the main burner kicks in (presumable boiling the water), then...

Will do...thanks

Hi this is all new to me, so... My heating hasn't worked properly for years, every year I get the boiler serviced and am told that it's burning efficiently, so have put the problem down to muck in the radiators which is keeping the downstairs rads cool/cold... hot water has never been a...