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HI It's not that & the pump is fine apparently I have a massive air lock & need to get rid of that, tried bleeding the system from the rads to no avail, been shown a cpl of other things to try ie open the central nut on the pump as the air lock seems to be near there,

I have a potterton 40el-80el boiler, I have boiling hot water but no heat from the rads, the pump was replaced about 5mths ago & it is still working (i can hear it makin its usual noise lol) I have bled all of the rads & got a lot of air out of the upstairs ones & also I tried to bleed the...