Display shows dH and refrigerator may have cooling issues or excessive frost in freezer.

Safety first: Disconnect power before removing panels or testing components.

• Inspect evaporator area: Remove freezer rear panel and check for heavy frost or ice around the evaporator coil. Excessive ice suggests defrost is not completing properly.
• Check thermistor placement: Ensure the evaporator thermistor is firmly clipped to the correct tubing and not hanging loose. A loose sensor can misread temperature and cause long defrost cycles.
• Test thermistor: With a multimeter, measure resistance at known temperatures (e.g., in ice water). Compare to GE thermistor resistance charts. Replace if readings are out of range.
• Inspect wiring: Look for damaged or corroded connectors between the evaporator area and the main harness. Reseat connectors.
• Control board evaluation: If the thermistor and wiring are good, the main control board may be mismanaging defrost. This usually requires a technician to confirm and replace the board.