Hi all, hope every one is well. I recently when to a job at a supermarket which has a compressor rack system with 4 compressors. Basically everything in the supermarket runs off the same system.

There is a cool room in there which is set to 4 degrees but it wont pull down to temperature and just sits at around 7 degrees and after about a day just ices up.
It has two evaporators running off the one solenoid and only one of the evaps totally ices up.

You can hear the solenoid opening and closing when you set the thermostat so that seems all fine. I changed and TXV on the evap that was icing up and now the solenoid valve. But then I set it back down to temp and it just ices up again. Could it be the TXV on the other unit? Im not sure what else to check. Fairly newbie at this game by the way. Appreciate any input!