Arrived at location on 7/23/21 - Found cooler at 48 degrees. Checked operations and found cooler needs a new thermostat and probes. Returned on 7/29/21 - Installed new control and when I tried to install probes found evap coil a solid block of ice and interfering with the removal of the drawer racks. Will let unit off overnight and return in the morning to install probes. Returned on 7/30/21 - Unit on and evap a block of ice. Told manager to leave off overnight Sunday and we will return Monday morning. Returned on 8/2/21 - Installed new probes in evap. Unit cooling but showing E13 error. Spoke with Delfield and issue communication error. Will need to replace display and communication cable. Will order and return. Returned on 8/6/21 - replaced display and cable on cooler working ok.