Hotpoint Fridge Dual Evaporator System Not Cooling:... | appliancefaults.com

Technical Background:

Hotpoint refrigerators with dual evaporator systems utilize a main control unit (MCU) to manage the cooling cycles for both the refrigerator and freezer compartments independently. The MCU monitors temperature sensors (thermistors) in each compartment and adjusts the operation of the compressor, evaporator fans, and damper controls accordingly. Voltage paths include 120V AC to the compressor and fan motors, and low voltage DC signals to the control board and sensors. A defrost cycle is initiated periodically to prevent excessive ice buildup on the evaporator coils. The damper controls airflow between the compartments to maintain desired temperature levels.

Symptoms:

The homeowner observes that the refrigerator compartment is not cooling adequately, while the freezer compartment might be functioning normally or also exhibiting reduced cooling. Food spoilage is occurring in the refrigerator. There might be excessive frost buildup in either the refrigerator or freezer section. The unit may be running constantly or cycling on and off erratically.

Possible Causes:

Defective defrost system components (heater, thermostat, timer).
Faulty evaporator fan motor preventing proper air circulation.
Damper door stuck closed, restricting airflow to the refrigerator compartment.
Refrigerant leak causing insufficient cooling capacity.
Compressor failing to pump refrigerant efficiently.
Malfunctioning main control board.

Solution:

1

Disconnect power to the refrigerator at the breaker panel.
2

Remove the evaporator cover inside the freezer compartment and inspect the evaporator coils for excessive ice buildup. Use a multimeter to check continuity of the defrost heater (should read approximately 20-40 ohms).
3

Test the defrost thermostat for continuity (should be closed when cold). If open, replace the thermostat.
4

Check the evaporator fan motor for proper operation (120V AC). Replace if it's not running or running noisily.
5

Locate the damper control and verify that it is opening and closing properly. Check the damper motor voltage (typically 12V DC).
6

Use a manifold gauge set to check the refrigerant pressures. If the pressure is low, locate and repair the refrigerant leak and recharge the system.
7

Visually inspect the main control board for any burned or damaged components. Replace the board if necessary.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Use caution when working with electrical components and refrigerant. Wear appropriate safety gear, including gloves and eye protection. Lock Out/Tag Out (LOTO) procedures should be followed.

Prevention:

Regularly clean the condenser coils (located at the back or bottom of the refrigerator) with a vacuum cleaner. Avoid overpacking the refrigerator, as this can restrict airflow. Check the door seals for proper sealing and replace if necessary. Ensure proper ventilation around the refrigerator.

Expert Tip:

Many Hotpoint refrigerators have a service mode that allows you to run diagnostic tests and troubleshoot problems more efficiently. Check the tech sheet located behind the kick panel or on the back of the unit for the service mode entry sequence. Usually holding certain buttons for 5 seconds.

Frequently Asked Questions

•What is the correct refrigerant type and charge amount for this refrigerator?

The refrigerant type and charge amount are typically listed on a sticker located on the back of the refrigerator near the compressor. Common refrigerants include R134a and R600a. Refer to the sticker for the exact specifications.

•How do I access the main control board on this Hotpoint refrigerator?

The location of the main control board can vary depending on the model. It is often located behind a panel on the back of the refrigerator or inside the refrigerator compartment near the top. You may need to remove screws or clips to access the board.

•What is the voltage range for the thermistors, and how do I test them?

Thermistors are variable resistors that change resistance based on temperature. To test, disconnect the thermistor and use a multimeter to measure resistance. Compare the resistance reading to a temperature-resistance chart for the specific thermistor. You may need the service manual or technical data sheet to obtain this chart for accurate measurement.

Hotpoint Fridge Dual Evaporator System Not Cooling: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct refrigerant type and charge amount for this refrigerator?

•How do I access the main control board on this Hotpoint refrigerator?

•What is the voltage range for the thermistors, and how do I test them?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: