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My plumber/heating engineer just got back to me and said he cleaned out the tank when he did the powerflush, so was shocked to see the current state. He thought maybe that a cleaner had been left in when the extension was built, but it had been drained and then inhibitor added directly to a...

That's the overflow.

Ok, I've just been and double checked. Definitely water in there, but let us just say I wouldn't be bathing in it! Black as coal. I held a glass of water under the vent pipe and it sucked up about an inch of water on start-up and back out again when the pump stopped. Seems as though blocked...

Thanks for that. I'd thought about restricted cold feed, although that pipework was mostly changed when the aerjec was fitted. Difficult to know for sure if air getting in downstream, but there are no water leaks and had also been pressure flushed without incident. One thing I should have...

Hi all, I realise this is probably a very common issue, but I have air getting into my central heating system and am not sure of the reason. System is open vented. We've had the problem since we moved here 10 years ago. Was collecting in 2 or 3 rads (2 upstairs and 1 downstairs). About 7...