Daikin vrv3 poor heating low pressure

Hi chaps I’ve got a fault with a vrv3 Daikin ,poor heating , low discharge , low suction
Frosting the slave condenser coil , inside the suction pipework too ,the master suction pipework also ,the master runs up the inv and one dol comp , it chucks up a LC error code on the master randomly but that runs the compressor ok 🙃looks like it’s had a inv comp on the slave ,2 fan motors on the master , new sensors and eev, the charge is right 🤔I’ve pulled this out to check the weight , any ideas 🤓