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On 3 at present but when turning down to 1 it still does it but slower. Would it cost much for a plumber to replace piping? Also is it something which can be diagnosed easily?

Thanks for reply The water starts almost as soon as heating is turned on. The pump has been replaced in the same place where it was sited before. A small pience of piping was cut where the feed comes from the F&e talk (t joint). I think it could be a blockage around this area. When...

Please someone help! I have an open vented CH system. I have recently had a new pump installed and a small pience of pipe replaced as a blockage was detected. I have turned the pump speed down and added F3 cleanser to the F&E tank. No Change. Hot water is still flowing from vent pipe...