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Thanks Namsag, you were quite correct lack of water in the system, blockage in cold feed. Many Thanks for the replies

Hi some advice please, there is no flow of hot water to either the Hot water cylinder or the radiators. System has been working fine for years with no changes made, consists of Potterton Netaheat boiler Grunfos pump and Honeywell 4073A 3 port valve. Boiler fires up pipes immediately ajacent to...