Today, when I walked behind the PSL room, I found the water chiller showed the message `FLtrS`. In the case that this is out of nominal state, I'm writing this in klog. It might be better to check the message by the person in charge.
Miyoki-san noticed the water level was low, so I added 2L of water this afternoon. Now water level is closer to MAX LEVEL.
I did not notice the meanning of the message that Yuzurihara-kun pointed out. I will check it next time when I enter the mine.
I checked the status of the water/air filters. The water filter was OK, but the air filter had some dust. I cleaned the surface of the air filter. The "FLtrS" message just counts the running time of filters and I reset the running time to zero. However, it was not possible to disable this "FLtrS" message even though I followed the manual. Probably it requires shutdown once or resetting all the setup. I just leave it this time.