Komatsu PC490 L01 fault code's

I have a problem with the air conditioner in my machine where it comes up with a L01 fault code and switches the air conditioner off, I have to restart the machine to clear the code and restart the air conditioning but I would rather sort the problem and repair it but I haven't got a clue what it could be. The fault code it shows is L01 879GKX.
It's on a 2013 Komatsu PC490LC -7.
Any help greatly received!

Komatsu PC490 L01 fault code's