Warning W11: the tested water quaity is beyond the standard

a) This failure may be resulted from the improper operation. First, judge whether the failure is ascribed to “the water quality is tested out of standard”, and then replace the cooling water.

b) The instrument is designed with water quality pre-alarm. When the  flickering sign occurs at the right upper corner of operating interface, replace the cooling water timely.

c) If the filter element turns yellow, replace the filter element timely; or when the black particle occurs, check whether water quality reaches the standard (TDS value of new water is generally ≤20).

d) If the problem cannot be resolved after the above steps, it should be the instrument line failure. Try replacing the TDS probe or water quality testing board.

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