R-SERIES MOBILE REFRIGERATORS —
INSTRUCTIONS FOR USE
9
www.metro.com
L01-499
REV G 02/20
BASIC TROUBLESHOOTING
WARNING
:
Only
fa
ctory approved service agents should attempt to service, repair or replace electrical
components. It is recommended that the refrigeration cassette should be removed from cabinet to
service electrical components.
1. Cabinet not cooling:
•
Upon initial start up, the refrigeration unit requires approximately 30 minutes to cool down.
•
Check that the outlet has power.
•
Check that the power switch is in the “On” position.
•
Check the cabinet wiring from the power cord to the power switch and to the controller.
• Check the door and door seals for air leaks.
2. Cabinet is too cold:
•
Adjust the operating temperature, Refer to PAGE 6.
•
Large quantity of very cold or frozen food has recently been added. Allow adequate time for the cabinet to recover to
its normal operating temperature.
• Defective temperature sensor and controller. Replace the sensor and controller.
3. No power to the cabinet:
•
Check that the power switch is in the “On” position.
•
Check that the power cord is plugged into the wall outlet and the outlet has power.
4. Refrigeration unit compressor does not start:
•
Compressor cable should be connected to compressor power cord. Verify that the Capacitor Start Assembly is
functioning properly. Look for any obvious defects on the capacitor, and verify that the relay is operating.
Replace if needed.
•
Review controller operation. Replace if necessary.
5. Excessive noise from refrigeration unit:
•
Fan blade hitting shroud or loose fitting. Re-install fan blade correctly.
• From the fan motor. Replace the motor and fan.
• From the inside of compressor. Replace the refrigeration unit.
6. Compressor starts but does not run:
• Loss of refrigerant. Replace the refrigeration unit.
•
Damaged tubings and capillary. Replace the refrigeration unit.
7. Compressor runs but cabinet temperature is warm:
• Loss of refrigerant. Replace the refrigeration unit.
•
Damaged tubings and capillary. Replace the refrigeration unit.
• Defective temperature sensor and controller. Replace the controller.
•
Defective gasket. Refrigeration cassette top gasket should be sealed, if necessary replace gasket.
•
Defective heat exchange on condenser/ Blocking air flow by dust, lint or fins damage. Clean the surface of the
condenser fins or straighten the bent fins. Refer to Page6.
8. Both compressor and condenser fan motors will not operate:
•
Replace the controller if necessary.
9. Evaporator frozen over:
•
Defective gasket. Top gasket should be sealed properly against cabinet floor, if necessary replace gasket.
• Loss of refrigerant. Replace the refrigeration unit.
• Damaged tubings. Replace the refrigeration unit.
• Defective temperature sensor and controller. Replace the controller.
•
Check if evaporator fan is operating. The airflow should come out from the fan assembly.
