Polar 66 keeps showing Hydraulic System Overheated (993)

[gafana]

It still functions fine after clearing the error. The strange thing is that this sometimes shows immediately on the very first cut after powering it up on a cold morning so I don't suspect it's actually overheating. Any ideas what could be triggering this error?

 

[gafana]

### SOLUTION ###
We were able to solve the problem. So for anyone facing the same issue, our problem turned out to be the K1 relay on the SAP66 board. He replaced the AXICOM 24VDC relay on the board and it's been working perfectly since then. Here is a photo of what the relay looked like.