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Onthedisplayofthe RS100 a low water pressure can be indicated. For further informationseetherelevant user manual. The installation will function optimally with a water pressure of between 22 and 25 PSI. If the water pressure drops below 14.5 PSI, the display will show FILL. During this message the boiler will remain functioning at a reduced level. After replenishing the system (see following chapter) just above 22 PSI the message FILL will disappear and the boiler will function normally again. W