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Fourth row: System status, It displays system maintenance information and
error messages for the ultrapure water section. The LCD background changes
to Yellow with maintenance information; changes to Red with alarm messages.
Messages scroll in sequence when more than one messages appears.
System Status
Message
Back Light
Meaning
EXCH. U PACK
Yellow
H Pack and U Pack cartridges have
reached its expected useful life.
Exchange the cartridges
EXCH. FINAL
FILTER
Yellow
Final Filter has reached its expected
useful life. Exchange the Final Filter
EXCH. UV LAMP
Yellow
UV Lamp has reached its expected
useful life. Exchange the UV Lamp
PRODUCT < S.P.
Red
Ultrapure water resistivity is below
preset level (failure)
TEMP > S.P.
Red
Water temperature out of
measurement range
