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Gotcha, and it just started doing it again before I went to bed, so I changed the speed to speed-3, the chuffing evened out and it stopped. Put it down to one and I thought the boiler was going to vibrate off the wall, so there we have it. Thanks for all your help, I might put some de-scaler...

I'll try that tonight and let you know. Why would the pump speeds make the boiler chuff though, if you pardon the expression? :o

As in, the 2nd of the two pumps near the boilermate II? It's on mid-speed, two. Haven't touched that.

Hey thanks mate, much obliged. Well I can only whack it up to speed three and see if it makes a difference. Anything for a full nights sleep..... :cry:

Both valves are open, yes! The pump works fine and the house heats and there is no coldness to the tops of any of the radiators. However, the pump is on speed one out of three. The old pump was on the highest speed - three. Someone said that this was unnecessary and probably was the reason it...

Hi there, I have a Potterton Suprima and a Boilermate II. Recently the central heating pump located near the BM II seized. I shut both gate valves, replaced the pump for like, bled the air out of the front screw (Grundfos 15/50) and opened the bottom valve. Central heating back on. Now the...