Liquid cooling module problems (NeptCore module)

Use this information to resolve problems with the Processor Neptune^TM Core Module (NeptCore).

See this section to resolve issues related to the NeptCore module.

Liquid leak problem

Liquid leaks can be identified through the following practices:

If the server is on remote maintenance,
- A Lenovo XClarity Controller event shows:
  FQXSPCA0040N: Liquid is leaking from open loop [CoolingSensorName].
- Lenovo XClarity Controller has defined lots of system conditions as IPMI sensors. Users can use IPMI commands to check system running status. Here are examples of executing ipmitool, an open-source common tool which follows Intel’s IPMI standard. Check for liquid leakage status with command lines as shown.
  - The event logs shown with the parameter:
```
sel elist
```
  - Liquid Leak ׀ EAh ׀ ok ׀ 30.1 ׀ Transition to Critical from less severe
    If liquid leakage happens, the log above will show up. The status of all sensors can be fetched with the parameter:
```
sdr elist
```
If the server is within reach, and the amber LED is lit on the front operator panel, potential liquid leaks may have occurred. It is required to open the top cover to check the LED status of the leakage detection sensor module. See Front-operator-panel LEDs and buttons and LED on the leakage detection sensor module for more details.

Steps to resolve liquid leaks

If the LED on the leakage detection sensor module is blinking green, follow the procedures to get help.

Save and back up data and operations.
Power off the server and remove the quick connect plugs from the manifolds.
Slide the server out or remove the server from the rack. See Install the server to the rack (friction rails) or Install the server to the rack (slide rails).
Remove the top cover. See Remove the top cover.
Check for liquid leaks around the outlet and inlet hoses, system board assembly, and under the cold plate covers:
Figure 1. Leak-prone areas

Note
If leak happens, the liquid tends to collect around 1 leak-prone areas.
1. If liquid found around the hoses and system board assembly, clean up the liquid.
2. If liquid found under the cold plate covers:
  1. As illustrated below, remove at least four DIMMs from both sides to get access to the clips on the cold plate covers. To remove memory modules, see Remove a memory module.
    Figure 2. Removing the cold plate cover
    1. Open the clips.
    2. Remove the cold plate cover.
  2. Clean up the liquid on the cold plates.
Check for the top cover of the server below to see if dripping happens. If yes, repeat previous steps to servers below.
Contact Lenovo Support.