Bayer HealthCare Rapidlab 800, Operator'S Manual

Page: 338 / 699

The wash did not completely clean the CO-ox sample path due to low volume or poorly
segmented flow.
If a D78 also exists, correct that problem first, then correct the D79.
Perform a wash.
Ensure that the Wash/Glu zero reagent bottle is installed properly. Check the
level of reagent. If the level is low, replace the reagent as described in
Replacing the Reagent Bottles in Section 3.
Check the CO-ox sample tubing for leaks or cracks. If necessary, replace the
tubing as described in Replacing the CO-ox Sample Tubing in Section 3.
Check that the gaskets in the CO-ox sample chamber and hemolyzer are seated
correctly. If necessary, reinstall either gasket as described in Cleaning the
CO-ox Sample Chamber or Cleaning the Hemolyzer in Section 3.
Perform the valves diagnostic test to verify that the wash, diverter, vent, and
wash bypass valves are functioning as described in Valves Test, page 4-62.
Perform the Pump Functions Test as described in Pump Functions Test,
page 4-58.
Check the CO-ox pump tubing for leaks, flattened areas, or other signs of wear.
Replace the tubing, if necessary, as described in Replacing the CO-ox Pump
Tubing in Section 3.
If the D code reappears, contact your Service Representative.