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Sounds to me like you have a loose wire somewhere, or the water is getting inside the pump connections. If you do think its the pump, turn off the power take out the wires to the pump and put the wires in to seperate connector blocks and turn on the power again and see if your problem is there...

Hi yes i checked the wiring harness and pluged in the code plug. Also this time i was reading the manual, for 20mins and after that fault code c1 came up, wireing harness or fan, New fan now installed and shes running like a good one. Cheers for you help tho. I can not belive it takes 20mins for...

Hi there, I went out to this boiler last night and there was no hot water or heating and no fault codes showing up, when its calling for heat the pump runs and thats it there is no power at the fan either, i rang worcester up they said it was defonatly pcb. So went back today changed pcd still...