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I thought I'd start a new topic as I've made a some developments... My issue is my Radiators are not heating up and boiler switches off (too hot) prematurely. I worked out it must be a circulation fault. After removing the motor head from my pump, I found a thick solid residue motor side...

:oops: Hello All, Your advice please!! 3 radiators cold downstair cold including feed pipe. The same upstairs 3 radiator cold too. The system is an oil feed system with expansion tank in the loft. When the system first switches on there is a popping/banging noise as-though there is...