How to Replace Samsung Upright Freezer Thermistor

Thermistor, not thermostat#

Modern Samsung freezers do not use a mechanical thermostat. A small thermistor reports the temperature to the control board, which then sets the inverter compressor's speed. When the thermistor drifts, the board acts on wrong numbers — running the compressor too hard, too little, or not at all — and often posts a 5E or other sensor code.

Tools and safety#

• Tools: Phillips #2 screwdriver, a multimeter, and wire connectors if a splice is needed
• Part: Samsung thermistor for your model (commonly a DA32-series number), or the control board if the sensor tests good
• Safety: Unplug the freezer. The sensor is low-voltage, but pulling power removes all risk.

Step-by-step#

1. Read the symptom#

Note the pattern: continuous running (too cold), short or no running (too warm), or wild swings. Check the display for a 5E code, other sensor codes, or a flashing temperature — all signs the board is getting invalid data.

2. Find the sensor#

The freezer thermistor usually clips to the evaporator coils or mounts on the rear interior wall behind the evaporator cover. Remove that rear panel (six to eight Phillips #2 screws) to reach it. The sensor is a small cylinder or flat body with a two-wire lead to a connector.

3. Test its resistance#

Unplug the thermistor from its harness and set the meter to ohms. At 0 degrees F a Samsung thermistor reads roughly 16,000-17,000 ohms; at room temperature (about 70 degrees F) roughly 5,000 ohms — confirm against your service manual. An open reading, a dead short, or a wildly off value means it has failed.

4. Remove it#

Note the mounting — clipped to the evaporator tube, taped to the wall, or snapped into a bracket — then release the harness connector and free the sensor. Keep the clip or bracket for the new one.

5. Fit the replacement#

Mount the new thermistor in exactly the original spot; the location determines whether it senses coil or air temperature, and the wrong position feeds the board bad readings. Press the connector until it clicks.

6. Reassemble and power up#

Refit the evaporator panel and its screws, restock the freezer, plug in, and set the display to 0 degrees F. The inverter compressor will start trimming its speed to the new readings.

7. Watch it for a day#

Put a thermometer inside and check at 4, 12, and 24 hours. It should settle at about 0 degrees F, within a few degrees, and hold steady without swinging. If it does, the fix held.

If the problem persists#

• Code returns after the swap: unplug for five minutes to reset the board; if it comes back, suspect the wiring to the board or the board itself.
• Still the wrong temperature: re-check the sensor's position — mounted away from its designed spot it reads inaccurately.
• Now too cold: the new sensor may run slightly different; nudge the set point up a degree or two and watch.
• Code flickers on and off: an intermittent harness connection — reseat it firmly and check the pins for corrosion.

Why the position matters so much#

A thermistor reads the temperature of whatever it touches, so a sensor left dangling in the air instead of clipped to the evaporator coil — or taped loosely to the wall — feeds the board a reading that lags the real compartment. That is why the single most important part of this job is putting the new sensor back exactly where the old one sat. After the swap, resist the urge to keep opening the door to check; every open lets warm air in and stretches the recovery the 24-hour test is meant to measure.