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Yes, if ballvalve is filling back to near overflow, then it is faulty, or fitted for too high level of water.
If it isn’t that, then must be blockage in feed pipe to heating, or split coil.
(If you are looking to see if coil is split, you will see the water coming up the feed of the f&e tank if you drain it first. Could be just a tiny amount though. Also test with heating running)
If it isn’t that, then must be blockage in feed pipe to heating, or split coil.
(If you are looking to see if coil is split, you will see the water coming up the feed of the f&e tank if you drain it first. Could be just a tiny amount though. Also test with heating running)