95% of all temperature problems are caused by 4 issues that you can quickly solve at store level.
WARNING: WHEN SERVICING YOUR DISPLAY, BE SURE TO CUT POWER TO THE UNIT IF ANY ACCESS PANELS WILL BE REMOVED AND TO FOLLOW ANY WARNING LABELS IN THE UNIT.
#1 Refrigerator Location and Operating Environment
Killion Open Refrigerators are designed to operate in ambient store conditions not exceeding 75°F and 55% relative humidity. Ensure that your refrigerator is located away from A/C vents, fans, doorways, or sources of heat. These can cause a disruption of the air curtain and will prevent proper cold air flow within the case.
#2 Dirty Condensing Coil or Air Filters
If your unit has a bottom-mounted condensing unit (all displays under 6ft tall) first locate the air filters and check if they need to be replaced. These air filters will be located as the lower front or in the back with the condenser. If your unit has a top-mounted condensing unit, there may or may not be an air filter immediately in front of the condensing coil. If there is a filter, determine if it needs to be replaced. If there is not a filter, brush off and vacuum your condenser coil.
#3 Blocked Exterior Intake or Discharge Grills
Be sure that the intake and discharge grills are not blocked. If your unit has a bottom-mounted condensing unit, the intake is typically at the lower front and the discharge runs up a chimney in the back. If your unit has a top mounted condensing unit, the intake is typically on the upper left or upper right side, and the discharge vents vertically to the ceiling.
#4 Blocked Interior Return or Honeycomb Discharge Grills
Be sure that the lower return air and the top discharge grills are not blocked. By keeping these clear you will greatly enhance display performance.
For more details on proper maintenance and service please see your service manual.