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Update Put the rads on last night, once again after about an hour the knocking started, so i did as you suggested and turn thermostat on that particular rad and...Hey presto it stopped and didnt occur again :D fingers crossed it has stopped for good, or do you think that was just a short term...

Bit of a novice with radiator etc knowledge and talk :oops: , but by the thermostatic valves do you mean the part to alter the temperature to each radiator? if so there is an 1 arrow pointing down, these are on the right side of each radiator, you said about turning the valve, do you mean those...

I have a problem with my pipes! After the radiators have been on for about an hour or so a knocking starts which works its way from the boiler through the kitchen and finally ends up at the radiator in the lounge. On my dads advice I have bled the radiators (twice now) but it hasnt stopped the...