How to Fix / Troubleshooting

Safety first: Disconnect power before working inside the freezer compartment.

Locate defrost thermistor: It is usually clipped to the evaporator tubing near the top or middle of the coil.
Check mounting: Ensure the thermistor is firmly clipped to the tubing and not hanging loose. Poor contact can cause incorrect readings.
Test resistance: Remove the thermistor connector and measure resistance at a known temperature. Compare to the Café thermistor chart if available. Replace if open, shorted, or far out of range.
Inspect wiring and connectors: Look for corrosion or broken wires between the thermistor and the main control board. Repair as needed.
Board diagnosis: If a new thermistor does not clear dS, the main control board may be defective and require replacement.

Freezer display shows dS; frost buildup or erratic defrosting may occur

Possible Causes