Hanna Instruments HI 83214 - Manual (Page 66)

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The instrument shows clear messages when erroneous conditions appear and when measured values are outside
the expected range. These messages are described bellow.
No Light: The light source is not functioning properly.
Light Leak: There is too much light when dark current is measured.
Inverted vials: The sample and the zero vials are inverted to each
other.
ERRORS AND WARNINGS
Light Low: The instrument cannot adjust the light level. Please check
that the sample does not contain any debris.
Light High: There is too much light to perform a measurement. Please
check the preparation of the zero cuvette.