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Does the boiler trip out via the stat after about 8-10 seconds after starting? If it does then your pump requires replacing. If the boiler dosn't trip out and just stays idle without circulating water it is more likely to be a valve failing to open within the boiler unit not the pump.
Hi All, Just to update you, boiler now working!!!, yippee!! gas pipes and system were totally blocked with some sort of horrible watery stuff, Im told im lucky it didn't make its way into the cooker, fridge and fire, phew!.