Please look at this post:
LED (VFD) Displays in LibreELEC
Try playing with the different settings, one of them should get it working.
Thanks, any ideas where I start, I've installed it fine now have a wifi icon but the clock is still scrambled, changing the display type didn't seem to do anything and the other values have so many combinations it could take me days to try them all. I tried the ones in that post and all it did was added an Ethernet icon even though Ethernet isn't connected.