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Water leakage causing enclosure shut down problems

Use this information to resolve issues related to enclosure shut down caused by water leakage.

Issue scenario: enclosure shut down caused by water leakage​

  1. If the water is observed outside of the enclosure, make sure to disconnect power cords from the PCS:

    1. Disconnect power cords from the PCS. See Disconnecting PCS power cords.

    2. Remove components from the enclosure to inspect source of the leak.

  2. If no water is observed outside of the enclosure:

Note

  • The N1380 enclosure, SC750 V4 tray, and SC777 V4 tray design is robust, and is unlikely to leak.

  • A small leakage may not reach either of the leak sensors to trigger a warning. Visual confirmation of a small leakage may be required.

  • The procedures above only cover the Lenovo DWC solution (from the Eaton Ball valves up through the manifold and into the enclosures and trays). If your datacenter Cooling Distribution Unit experiences repeated or frequent low water alerts then you should inspect the data center plumbing between the Cooling Distribution Unit and the Lenovo DWC solution (rack).

Water leakage detecting work flow​

When encounter unexpected enclosure shut down, complete the work flow below to detect water leakage source.

  1. Check PCS LEDs, see Power Conversion Station (PCS) LEDs behavior for leakage indication.

    1. If the PCS LEDs indicate that it is PCS leakage, complete the procedures in PCS leakage problems.

    2. If PCS leakage is not the case, it may be enclosure leakage or tray leakage. Check PCS LEDs, if the LEDs indicate enclosure leakage or tray leakage, go to Step 2.

  2. Check whether it is enclosure leakage:

    1. Disconnect power cords from the PCS. See Disconnecting PCS power cords.

    2. Pull out every tray out of the enclosure for 10 cm.

    3. Wait for 10 minutes.

    4. Re-connect power cords to the PCS.

      1. If the enclosure shuts down, the leakage is enclosure leakage. Complete the procedure in Enclosure leakage problem troubleshooting.

      2. If the enclosure powers on normally, the leakage may be tray leakage, go to Step 3.

  3. Check whether it is tray leakage:

    1. Connect an RJ45 cable to the SMM3.

    2. Check the SMM3 event logs and inspect leakage. See Tray leakage and leakage sensor problems.