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Instrument control is frozen, instrument summary page says busy 0 of 0 injections running in UNIFI - WKB16237

Article number: 16237


  • No instrument control
  • Run was stopped mid sample set due to error or customer interference
  • Sample set stuck and was cleared using System Monitor. For example, now it says 0 of 0 instead of 6 or 8 injections running
  • Electronic reboot has been performed of the workstation or server, LND and client
  • Electronic reboot has been performed on the instrument
  • LC is stuck in a busy state
  • The instrument and the LND or workstation cannot be taken off line


  • VION 2.0 driver
  • Xevo G2-XS


Sample set is stuck in a run mode when the user has tried to stop it


  1. Exit all UNIFI protals on the Clients or Workstation.
  2. On the workstation or the server:
    1. Stop the watservicehost.
    2. Right-click the task bar at the bottom of the window and open task manager.
    3. Go to the services tab.
    4. Browse for WatServicehost.
    5. Right-click on it and select stop.
  3. Wait for all eight watservicehost processes to disappear under processes on a Workstation or wait for all seven watservicehost processes to stop and disappear under the processes tab on the Server.
  4. Browse to Install Drive:\Program Files\Waters\UNIFI\Server\Bin\Waters.Diagnostictool.exe.
  5. Double-click to run the Waters.Diagnostictool.exe.
  6. It should show an orange progress bar at the bottom left. When complete, there is a button at the bottom right to clear the sample queue. Select this. It asks you to save the file. Give it a name and location. Close this tool.
  7. Start the watservicehost service under the task manager - services (right-click watservicehost and select start).
  8. Wait for all eight (workstation) or all seven (server) watservice hosts to start up.
  9. Log into UNIFI.



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