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Hi , i drained the whole system to change the pump. the pump has never been changed in 20years. when i touched the pump it was not spinning but felt boiling hot to touch so assumed it was seized and faulty. it was a grudfos pump [ups15-50]. so i tried to manually unseize it by remving the...

thanks Paul..ive checked and there is water in the header tank . however im not sure how i would check blockage on cold feed pipe. air in the system? any advice appreciated

Hi my elderly mum has Vaillant ecotec plus 418 on an open vent system falshing F22. the boiler is now outside warranty . the manual says low pressure . but there are no filling loops underneath the boiler. Her neighbour says thats coz its NOT a pressurised system and to look at the pump [...