Yet again we turned our central heating (Potterton Flamingo 50 boiler) on for the first time last night and it's not working. This has happened for the last 3 years and it's been a stuck pump. We checked the pump this morning and freed up the shaft which is now rotating and seems to be working OK- Vibrating and very hot. The pipe feeding the pump from the boiler is a lot warmer than the pipe coming out of the pump - Don't know if that is relevant. Hubby and I been trying to get central heating to work this morning but have been doing so after the hot water only had been on for 3 hours or so, so fully heated and tank full. Think we may now have too much hot water circulating that it's causing noisy pipes into the overflow tank in the loft, but would this prevent water circulating to the radiators? Does anyone have any suggestions please?