Frigidaire Refrigerator Error Code SH — Temperature Sensor Short
What this means
The SH error code on Frigidaire refrigerators means a temperature sensor (thermistor) has developed a short circuit. The control board can no longer read accurate temperatures from that sensor, which disrupts cooling regulation. The refrigerator may run constantly, not cool at all, or cool unevenly. The SH code can appear for either the freezer thermistor or the fresh food thermistor, depending on which display shows the error.
Step-by-step fix
4 stepsIdentify which sensor is affected
Check where the SH code is displayed. If it appears on the freezer temperature display, the freezer thermistor has shorted. If on the refrigerator display, the fresh food thermistor is the problem.
Some models alternate between showing SH and the temperature — note which display is affected.
Locate the thermistor
Unplug the refrigerator. The freezer thermistor is typically clipped to the evaporator coil or mounted on the freezer wall behind the rear panel. The fresh food thermistor is usually clipped near the air inlet at the top of the fresh food section.
Check your model's wiring diagram (usually on the back of the unit or inside the control housing) for the exact location.
Test the thermistor
Disconnect the thermistor's wire connector. Set your multimeter to resistance. At room temperature (around 75°F), a good Frigidaire thermistor reads approximately 16,600 ohms. A reading near zero ohms confirms a short circuit.
The resistance should increase as the sensor gets colder and decrease as it warms — test this by holding the sensor in your hand.
Replace the thermistor
Unclip the old thermistor from its mounting location. Connect the new sensor to the wire harness and clip it in the same position. Reassemble any panels, plug in the refrigerator, and monitor for 24 hours to confirm the error clears and temperatures stabilize.
Thermistors are inexpensive (typically under $20) and quick to replace — this is one of the easier refrigerator repairs.
When to call a professional
If replacing the thermistor doesn't clear the SH code, the control board's sensor input circuit may be damaged and should be professionally diagnosed.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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