Admiral Refrigerator Dual Evaporator Not Cooling:... | appliancefaults.com

Technical Background:

The Admiral refrigerator utilizes a dual evaporator system, meaning there are separate evaporators for the refrigerator and freezer compartments. The main control board (MCU) controls the operation of the compressor, evaporator fans, defrost heater, and other components. Voltage is supplied to these components through wiring harnesses and relays on the board. Sensor inputs provide temperature feedback to the MCU.

Symptoms:

The refrigerator compartment is warmer than normal, food spoils quickly. The freezer compartment may also be warmer than normal, or ice cream may be soft. You may hear the compressor running, but the refrigerator is not cooling effectively.

Possible Causes:

Failed evaporator fan motor(s)
Defective defrost heater or defrost thermostat
Sealed system restriction or leak
Faulty main control board (MCU)
Airflow obstruction (ice build-up)

Solution:

1

Unplug the refrigerator or turn off the breaker. Always LOTO.
2

Access the evaporator coils in both the refrigerator and freezer compartments. Inspect for excessive ice build-up. If present, manually defrost the unit with a hairdryer on low setting, taking care not to damage any components.
3

Test the evaporator fan motors in both compartments for proper operation. Use a multimeter to check for 12V DC at the fan motor connector when the door is closed (simulating normal operation). Replace any failed fan motors.
4

Test the defrost heater for continuity using a multimeter. If open, replace the defrost heater.
5

Test the defrost thermostat for continuity when cold (below 40°F). It should be closed. If open when cold, replace the defrost thermostat.
6

If the above components test okay, suspect a sealed system issue. Connect gauges to the process ports and check the refrigerant pressures. Low pressures indicate a leak or restriction. A sealed system repair requires a certified technician.
7

If all components test good and the sealed system is functioning, consider replacing the main control board (MCU).

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. High voltage is present within the appliance. Wear appropriate safety gear, including safety glasses and gloves. Use proper Lock Out Tag Out (LOTO) procedures when working on electrical appliances.

Prevention:

Clean the condenser coils every 6 months with a vacuum cleaner brush attachment. Avoid overpacking the refrigerator, which can restrict airflow. Ensure the door seals are clean and in good condition to prevent air leaks.

Expert Tip:

Many Admiral refrigerators have a service mode that allows you to manually activate components for testing. Consult the service manual for the specific model to access and use the service mode. Often pressing the 'Door Switch' and 'Freezer Temp Down' button for 5 seconds enables service mode.

Frequently Asked Questions

•How do I access the evaporator coils on this Admiral model?

Typically, you need to remove the rear panel inside the freezer and refrigerator compartments. This usually involves removing screws and carefully prying the panel loose. Be careful not to damage any wiring or tubing.

•What refrigerant type does this refrigerator use, and what are the proper pressures?

Check the data plate of the unit to verify the refrigerant type. Common refrigerants include R134a and R600a. Typical running pressures for R134a are around 2-5 PSI on the low side and 150-180 PSI on the high side, but this varies based on ambient temperature and load.

•Where is the defrost thermostat located, and how do I test it accurately?

The defrost thermostat is usually clipped to the evaporator coil. To test it accurately, it needs to be below 40°F. You can place it in a glass of ice water for a few minutes before testing with a multimeter for continuity. It should show continuity (closed) when cold and open when warm.

Admiral Refrigerator Dual Evaporator Not Cooling: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the evaporator coils on this Admiral model?

•What refrigerant type does this refrigerator use, and what are the proper pressures?

•Where is the defrost thermostat located, and how do I test it accurately?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: