Hi Max,
this seems to be sensor issue not the logic board
this issue covers by warranty you can check your warranty status from the link
https://www.hgst.com/warranty/index_gtech_serial.do?fromGtech=yes
also have look to the brand policy as mentioned in there web site
Field Replaceable Parts - G-SPEED FC / G-SPEED XL Products
If you have a G-SPEED FC and XL product and require a replacement part, please contact G-Technology support for a parts RMA (i.e. power supply, fan or controller board)
For all multi-bay units with removable hard drive assemblies: To replace a failed hard drive, please remove the drive from the assembly (drive sled or tray) by removing the attaching screws
After obtaining an RMA, ship the bare drive to G-Technology and a replacement drive will be returned