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Thanks Tibbot. I'm in a tight spot: we're in the process of selling our house and due to move out on Wednesday. The only replacement pump I can get in a hurry is a Plumb Center own brand one. Do you think one of these will do? Any tips on fitting one?

Hi all, I have a condensing boiler with a non-gravitational route for the condensate. The company who fitted the boiler fitted a Grundfos Conlift pump to sort out the condensate. The pump is now playing up and overflowing. I can pour water into it until it overflows and it will do nothing...

thanks, that's good to know.

Thanks for your suggestion. No, the pressure isn't rising and I have made sure that the fill valve is fully closed. Also, as I said in my post above, when I remove the key and water pours out, the pressure in the heating loop drops, so I'm not sure it could be anything but a problem with the...

If I attempt to withdraw the key I get a blast of pretty high pressure water which doesn't stop until I put the key back in. After testing this, I can see that the pressure in the heating loop has dropped, so I suspect that you are right, and that the valve on the heating side is jammed open...

Thanks Tony, that's a great document - very clear. I can confirm that I am following those instructions to the letter, and I still have the problem. Is there any hope?

Thanks for your reply. I got the torch out and I see the symbols, the only problem is that they doesn't seem to want to come out in the padlock closed position, it only wants to come out in the padlock open position. That seems really odd. The padlock open position was the one I put it in to...

Have recently had a Greenstar 30CDi installed (professionally) and it is working well. When it was installed I had one of my radiators off the wall due to redecorating. I put the radiator back on tonight, connected, bled, all well. The pressure in the heating loop had dropped a little so I...