Boiler pressure rising?

The pressure in our gas boiler keeps rising. I've bled the radiators which brings it down temporarily. The top up valve is tightly closed so I can't figure out where the water is getting in.

3 Answers

ADHS Plumbing & Heating
3 Reviews, 100% Positive
Possible expansion vessel problem or it could just be a slight inlet off the cold supply to the heating system via the filling loop.

ADHS PLUMBING & HEATING
27th Jun 2019
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It could be your exspaion vessel has lost its air and needs to be pumped back up. or there could be a split/pin hole in it.
9th Jul 2019
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Expansion vessel in boiler, common problem.
10th Jul 2019
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