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Can you tell if the cold feed on a vented system is blocked, without cutting into the pipework?

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Can you tell if the cold feed on a vented system is blocked, without cutting into the pipework?

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Not conclusively, but if you cap off the expansion pipe before attempting to drain down the contents of the expansion tank into the Clearflow tank (see the Clearflow instructions), then if water doesn’t run down into the Clearflow tank, there’s a very strong possibility of a blockage. Engineer’s tip:- If the blockage contains much black iron oxide (known as magnetite), you can tell it’s there by holding a small magnet near the copper pipe – you’ll feel it being attracted to the magnetite through the wall of the copper pipe.

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