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Error code reference

Frigidaire Refrigerator Error Code 38

Freezer sensor shorted.

Frigidaire codesFrigidaire refrigerator codes

Freezer sensor shorted.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 38 means on a Frigidaire refrigerator

Error code 38 on a Frigidaire refrigerator indicates that the freezer temperature sensor (also called the freezer thermistor) has been detected in a shorted condition. A short occurs when the sensor's internal resistance drops to near zero ohms, which sends an out-of-range signal to the main control board. The control board continuously monitors the thermistor's resistance to calculate the actual temperature inside the freezer compartment. When a short is detected, the board can no longer trust the temperature data and triggers this fault code.

The freezer thermistor is typically a negative temperature coefficient (NTC) resistor, meaning its resistance decreases as temperature increases. Under normal operating conditions, the sensor produces a predictable resistance curve. A shorted thermistor collapses this resistance abnormally, causing the control board to read an impossibly high temperature or a nonsensical value. This can result in erratic compressor cycling, improper fan operation, or the freezer failing to maintain the correct temperature setpoint.

The most common causes of a shorted freezer sensor include physical damage to the sensor or its wiring harness, moisture intrusion at the connector, or an internal failure of the thermistor component itself. The wiring between the sensor and the control board should be inspected for pinched, chafed, or melted insulation, which can cause a wire-to-wire or wire-to-chassis short. Connector corrosion can also create unintended electrical paths that mimic a shorted sensor reading.

Source: manufacturer service documentation.

Common causes of 38

  1. 01

    Failed freezer thermistor

    Part replacement

    The thermistor itself has developed an internal short circuit, causing its resistance to drop to near zero. This is the most frequent cause and requires replacing the sensor.

  2. 02

    Damaged wiring harness

    Part replacement

    The wiring between the freezer sensor and the control board may be pinched, chafed, or melted, creating a short between two conductors or to the chassis. Inspect the full length of the harness for visible damage.

  3. 03

    Corroded or moisture-damaged connector

    Wiring / connection

    Moisture intrusion at the sensor's wiring connector can cause corrosion that creates unintended electrical contact between pins, mimicking a shorted sensor. Inspect the connector for rust, oxidation, or water residue.

  4. 04

    Control board fault

    Part replacement

    In less common cases, the main control board's sensor input circuit may have failed internally, causing it to incorrectly report a short even when the sensor and wiring are intact. This is typically diagnosed after ruling out the sensor and harness.

See the test procedure for each cause

Frequently asked questions about 38

What does 38 mean on a Frigidaire refrigerator?
Error code 38 on a Frigidaire refrigerator means the control board has detected a shorted freezer temperature sensor. The freezer thermistor is responsible for measuring the temperature inside the freezer compartment and sending that data to the control board. When a short is detected, the board cannot accurately read the freezer temperature, which can affect cooling performance and compressor operation. The fault needs to be diagnosed by inspecting the sensor, its wiring, and the connector.
Can I fix error code 38 on my Frigidaire refrigerator myself?
A knowledgeable DIYer can diagnose this code by visually inspecting the freezer thermistor, its wiring harness, and the connector for obvious damage, corrosion, or moisture. If the wiring checks out, testing the thermistor's resistance with a multimeter and comparing it to the expected value at a known temperature can confirm whether the sensor has failed. Replacing the thermistor is a relatively straightforward repair if you are comfortable disconnecting components and working inside the appliance. If the sensor and wiring both appear good, the control board may be at fault, which is a more involved diagnosis.
Will resetting my Frigidaire refrigerator clear error code 38?
Performing a reset by unplugging the refrigerator for a few minutes may temporarily clear the error code from the display, but the code will return if the underlying fault is still present. A shorted thermistor or damaged wiring will continue to send an out-of-range signal to the control board, re-triggering the fault. A reset is useful for confirming whether the error is intermittent or persistent, but it is not a fix for the actual problem.
Is it safe to keep using my refrigerator when error code 38 is showing?
Operating the refrigerator with error code 38 active carries some risk because the control board cannot reliably monitor or regulate the freezer temperature. The freezer may run too warm or cycle improperly, putting frozen food safety at risk. Short-term use while waiting for parts is a judgment call, but you should monitor the freezer temperature independently with a thermometer and avoid storing critical items until the fault is resolved.
How much does it cost to repair error code 38 on a Frigidaire refrigerator?
If the freezer thermistor itself is the cause, the part typically costs in the range of $15 to $50 depending on the model, making it one of the more affordable repairs. Labor costs for a professional technician can add $80 to $150 or more depending on your location and service provider. If the control board is at fault, parts and labor combined can bring the total repair cost into the $200 to $400 range or higher. Getting a diagnosis before committing to a repair helps avoid replacing parts unnecessarily.

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