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Well, I've drained and flushed the system, and backflushed the lowest pipe runs back through the pump and boiler, and refilled with a system cleaner in there. I ran the system with the CH pump on for an hour or so, and then switched that off and left the HW system on for a couple of hours. The...

Hi, I have a Potterton diplomat 41/48, with an indirect feed to the hot water system, and a separate pumped feed to radiators, currently not used.A fault on the header system allowed some air into the system, noticed as the boiler was kettling, and one pipe to the HW tank was hot, the other...