I think you will have to call VM.
You could try a factory reset if you haven't already tried that, go to Settings > System > Factory Reset
It's only a partial system reset and not a complete factory reset. You are given 2 options,
Keep Recordings
Format Disk
Choosing Keep Recordings, means you won't lose your recordings and any planned recordings or series links you've set up, but you will
have to sign into your apps such as iPlayer, Prime, Netflix and ITVX again, also Match frame rate and Standby power consumption will
go back to their default settings if you have changed them.
If the hard drive is faulty which is usually what CS6002 means then you will have lost your recordings already so you will not have anything to lose if you try the format option, it may not even work if the drive is faulty.