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Sound, that way it should show if the actuator has failed? The 'slider' on the side is giving no resistance so I'm guessing a valve is stuck in one position. Lets just say, Potterton is not on my shopping list in looking for it's replacement. But it appears Worcester owns Potterton and most...

Long time lurker and first time poster :mrgreen: My old nemesis, the boiler, is out to test me again. It's 10 years old, and after many repairs (including tig welding the water jacket) it's destined for replacement in the new year. So, of course,in it's swansong it's throwing a hissy...