GE Refrigerator H1 vs H2 Error: Troubleshooting Freezer... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) monitors the temperature in the freezer and refrigerator compartments using thermistors (temperature-sensitive resistors). The MCU adjusts the compressor and fan speeds based on these temperature readings. If the MCU detects an out-of-range temperature or a faulty thermistor signal, it displays an H1 (freezer issue) or H2 (refrigerator issue) error code. The MCU supplies a low voltage (typically 5V DC) to the thermistor circuit, and the voltage drop across the thermistor changes with temperature.

Symptoms:

The homeowner reports that the freezer is too warm (H1) or the refrigerator is too warm (H2). Food may be spoiling, and the unit might be running constantly or not at all.

Possible Causes:

Defective freezer thermistor (H1).
Defective refrigerator thermistor (H2).
Wiring harness issue to the thermistors.
Faulty main control board (MCU).
Blocked air vents between freezer and refrigerator.
Evaporator fan motor failure.

Solution:

1

Unplug the refrigerator or turn off the breaker.
2

Locate the freezer and refrigerator thermistors (usually near the evaporator coil or on a side wall).
3

Using a multimeter, measure the resistance of both thermistors. At room temperature (around 70°F), a typical thermistor should read approximately 5k to 10k ohms. Note the values.
4

Inspect the wiring harness connected to the thermistors for any damage or loose connections. Use a wiring diagram to trace the wires back to the main control board.
5

At the main control board, check the voltage (typically 5V DC) supplied to the thermistor circuit.
6

If the thermistors are out of range or the wiring is faulty, replace the defective thermistor or repair the wiring.
7

If the thermistors and wiring are good, suspect a faulty main control board and consider replacement.

Safety Warning:

Always disconnect power to the refrigerator at the breaker panel before performing any repairs. Use proper Lock Out/Tag Out (LOTO) procedures to prevent accidental energization. Be aware of high voltage components on the main control board.

Prevention:

Clean the refrigerator coils every 6 months to ensure proper airflow. Avoid overpacking the freezer or refrigerator, which can block air vents. Regularly check the door seals for proper sealing.

Expert Tip:

Many GE refrigerators have a service mode that allows you to view real-time temperature readings and run diagnostic tests. Consult the service manual for instructions on accessing the service mode (often involves pressing a combination of buttons on the control panel).

Frequently Asked Questions

•What is the typical resistance range for a GE refrigerator thermistor at 32°F?

At 32°F (0°C), a typical GE refrigerator thermistor should read around 15k to 20k ohms, depending on the specific thermistor type.

•Where is the main control board usually located in a GE side-by-side refrigerator?

The main control board is typically located at the top rear of the refrigerator, behind a service panel.

•Can a faulty defrost heater cause an H1 or H2 error?

While a faulty defrost heater primarily affects the freezer's ability to defrost, indirectly, it can contribute to temperature inconsistencies and potentially trigger an H1 or H2 error due to ice buildup affecting airflow and thermistor readings.

GE Refrigerator H1 vs H2 Error: Troubleshooting Freezer and Refrigerator Compartment Faults

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a GE refrigerator thermistor at 32°F?

•Where is the main control board usually located in a GE side-by-side refrigerator?

•Can a faulty defrost heater cause an H1 or H2 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: