最近遇到一个软件版本为10.03的Gambro AK95S 血透机的故障，代码为：C COFF 088 024。
查询ERROR CODE 手册，说明如下：

C COFF 088 024 CONDUCTIVITY TEST ERROR,
CONDUCTIVITY COMPARE ERROR (HIGH CONDUCTIVITY TEST)
Unconditional error, blood pump available

General description of conditions for occurring:
- The conductivity difference between CPU C and CPU P is too large in the conductivity test high phase.
- The difference between CondA (FRI(FI_MM90CONDA)) and CondP (AK95P.CPU_P.SUP.MEAS.AD_INPUT.condValue) is outside limit +/- 1mS/cm

- The difference between CondA (FRI(FI_MM90CONDA)) and CondB (FRI(FI_MM90CONDB)) (AK95P.CPU_P.SUP.MEAS.AD_INPUT.condValue) is outside limit +/- 0.3mS/cm

Technical description of conditions for occurring:
- PRI(PI_CondHighDiffErrCnt) > 4
- The difference between CondB (FRI(FI_MM90CONDB)) and CondP (AK95P.CPU_P.SUP.MEAS.AD_INPUT.condValue) is outside limit +/- 1mS/cm

Some possible explanations why the error has occurred:
- Conductivity cell B is broken or uncalibrated
- Conductivity cell P is broken or uncalibrated
- Conductivity cell A is broken or uncalibrated
- The A/D converters are uncalibrated (CPU P, MM 95)

故障现象为：自检程序完成后，开始吸A液，直到电导度为22.6mS，然后旁路橙线显示，等待15s左右，A泵继续吸液，电导度继续上升至 25~26mS左右，紧接着电导度开始下降，返回到22.6mS。稳定2分钟后，红色扳手指示，报警故障代码为：C COFF 088 024。

正常情况应为：自检程序完成后，开始吸A液，直到电导度为22.6mS，然后旁路橙线显示，等待15s左右，A泵继续吸液，电导度继续上升至 25~26mS左右，紧接着电导度开始下降，返回到22.6mS。稳定10s左右，B泵开始缓慢转动吸液，电导度迅速下降至6~7mS左右，然后又逐渐上 升，最后稳定在14.2mS。旁路绿色指示！透析液准备完毕。

按照故障代码的提示：B、P、A三点电导监测的电导测量单元有可能损坏或未校准，经维修诊断程序检查和替换性检查后发现电导监测传感器工作正常准确，排除这几种可能。

最后解决：采用推荐的热消毒＋2%柠檬酸方法对机器进行日常消毒维护。