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HELP PLEASE. my apollo is kettling loudly, more so when hot water is on.is also banging after kettling sound.4 rads upstairs ok but 3 downstairs are cold(inlet pipes are cold) have just replaced pump and this seems to be working ok (.sometimes sounds like plane going overhead )...

hi and help probs, 1.loud banging 2.vent pipe in loft sending back red hot water 3.upstairs rads hot(4) downstairs cold 4.pump and pipes are red hot 5.probs seem worse when boiler stat on high so using on low at mo any advice welcome thankyou...