Refrigerator runs constantly and is too cold, freezing food in the fresh food compartment.

Safety First: Unplug the refrigerator before accessing sensors or control boards.

Steps:

• Verify settings: Check that the refrigerator temperature is not set to the coldest level. Adjust to a mid-range setting.
• Check thermistor placement: Ensure the refrigerator thermistor is properly mounted on the wall or in its housing and not touching a cold air outlet directly.
• Test thermistor: With the unit unplugged, remove and measure the thermistor resistance at known temperatures. Replace if readings are out of specification.
• Inspect air damper: Confirm that the damper between freezer and fridge is not stuck fully open. Replace the damper assembly if it does not move.
• Control board evaluation: If sensors and damper are good but the compressor never cycles off, the main control board may have a stuck relay and require replacement.