Cbc analyzer produced several erroneous results.Error identified when the controls did not work.Auto rinse done and controls worked.A little later the errors started occurring again.Shutdown the instrument and all 3 levels of controls ran and worked.Later the errors began again.Service notified.Manufacturer response for cbc analyzer, sysmex cbc analyzer (per site reporter): found the wbc part of the reaction chamber not draining, mv 66 draining slow.Removed clog in the wbc part of the reaction chamber, replaced drain tubing and drain valve.All levels of customer qc have been run and results are within the customer specified ranges.Instrument tested operational.Root cause: clog in wbc port of reaction unit.
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