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Bosch Greenstar floor mount combi P151 (kwb42-3) boiler pressure

pwoll Member Posts: 2
I have a Bosch Greenstar fs combi kwb42-3 boiler with a pressure gauge that is resting
less than 1 bar and need to top up the pressure to 1 bar. Need to know how to top up
the pressure. I cannot find and key or keyless valves in the unit.