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To add to my message excuse the original spelling. Any pumping up of the heat exchanger rubber diapragm should be done only if you are competent to do so and then only when the pressure on the water side has been relieved to zero. If its the heat exchanger which seems likely as this model has a...

The expansion vessel for this boiler can simply be checked and "pumped " back up to 0.85 bar (12 psi.). It is at the top right hand side of the boiler with its own small cover (3 screws). It is an ordinary schrader valve and can be pumped with a footpump held in hand . If the heat exchanger is...