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I think it's a problem with the cylinder itself as I can heat it up either with the boiler or Immersion, think it needs repressurising, which I have tried (following YouTube videos) but doesn't seem to be working.

Hi All I have mistakenly overheated my unvented cylinder by using the immersion and hot water was pouring through the tundish. I ran off all the hot water which stopped the release valve from opening. Since then every time the water heats up it pours through the tundish, I have checked and...