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Greenstar 25 combo boiler?

The washers on my worster boiler key seems to big what can I do to repressurise it

Eve
September 2023
Exactly what do you mean by "The washers on my worster [sic] boiler key seems to big"?

The manual should tell you exactly how to pressurise it.

Exactly which Worcester Bosch Greenstar do you have? There's several manuals available here:

https://www.worcester-bosch.co.uk/professional/support/literature/greenstar-si-combi-installation-instructions

Ghhh
September 2023
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Find out how to mend Greenstar home heating systems