Refrigerator runs constantly and is too cold or forms frost on food; compressor rarely shuts off.

Safety first: Unplug the unit before accessing sensors, dampers, or control boards.

Steps to address constant running:

• 1. Verify door seals: Inspect gaskets for gaps or tears. Close a sheet of paper in the door; it should have resistance when pulled. Replace door gasket if loose.
• 2. Check temperature settings: Set to factory recommended temperatures and avoid the coldest settings.
• 3. Test thermistors: Measure resistance of fresh food and freezer thermistors and compare to the tech sheet. Replace any that are out of range.
• 4. Inspect air damper: Ensure the damper is not stuck open, flooding the fresh food section with cold air.
• 5. Evaluate control board: If sensors and damper are good but the compressor never cycles off, the main control board may have a stuck relay and need replacement.