Refrigerator displays H2; often associated with high temperature in the freezer or sensor fault.

Safety first: Disconnect power before removing freezer panels.

Step 1: Confirm actual temperature

• Place an appliance thermometer in the freezer for at least 30 minutes.
• If the temperature is above 10°F (-12°C), there is a cooling issue.

Step 2: Check door and gasket

• Ensure the freezer door closes fully and the gasket seals all around.
• Look for frost around the door opening, indicating air leaks.

Step 3: Inspect evaporator and fan

• Remove the rear freezer panel and check for heavy frost blocking the evaporator.
• Listen for the evaporator fan; if it is not running while the compressor is on, test and replace the fan motor.

Step 4: Test freezer thermistor

• Test the thermistor resistance and replace if out of specification.

When to call a technician: If the evaporator has only a small frost patch or none at all, there may be a sealed system problem (low refrigerant, weak compressor) that requires a licensed technician.