Potterton 60e - Cuts Out Since Draining

I hope that someone can help. I have drained my heating system to fit a new pump and fill it with cleaner as it is rather inefficient. I have refilled it and bled the rads, the pump, the high-point in the airing cupboard and above the boiler itself. The system is quiet, but the boiler over-heat button pops after a few minutes. I wait for while, reset it and try again, but with the same result.

I assume that there is a air-block in the boiler itself, but I do not know how to shift it. Does anyone have any suggestions?

Please note that this is not a result of me fitting the new pump: this problem happens every time the system is drained for anything at all.

Thank you.

James.

take the centre disc off the pump whilst its running. use a tea towel or bowl to catch water dribbles and the disc, dont let it drop cos it will find a hole in the floorboards sure as hell.see if that gets it running for longer.

Turn it all on and turn the pump speed up and down to move any air around.

Andy

Thank you for the suggestions. I have tried both of these and then just left it for a while. It all seems well now.

Thank you.