Could be your expansion vessel diaphragm has gone - A quick check is to tap it & see if it is empty or full.
If its an Unvented HW tank which by the way it wrote it is, its not just as simple as recharging it you need to do it a certain way and they are dangerous so not something to fuck about with if you dont really know what your doing.
Is recharging it the same as tapping it on the side? I'll be sure to avoid doing that again, if it's dangerous.
@konastab01 started
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Could be your expansion vessel diaphragm has gone - A quick check is to tap it & see if it is empty or full.