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Yes, have now identified lack of circulation as the problem and this seems to be caused by a dodgy pump. With the power on, I removed the screw on the pump and manually turned the shaft. It was free to rotate and at first nothing happened but I kept turning it and then if fired into life and...

No, the pump is seperate to the boiler and is in the airing cupboard next to the water cylinder. Yes and it is working ok

My system ..... Glow Worm Micron 50FF Boiler Honeywell Programmable Timer (Heating & Hot Water programmed independently) Honeywell Room Stat Grundfos UPS 15-50 Water Pump 3-Way Motorised Valve Here's my problem..... When called upon by either heating / hot water or a combination...