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Error code reference

Frigidaire Refrigerator Error Code Ice Room Sensor Error

Sensor system in ICE ROOM has errors; temperature error code displays when sensing temperature is more than…

Frigidaire codesFrigidaire refrigerator codes

Sensor system in ICE ROOM has errors; temperature error code displays when sensing temperature is more than 149°F or less than -58°F.

First step from the service manual

Check voltage of MAIN PCB CN31#3 <-> CN76#1: shall be between 4.5V~1.0V.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Ice Room Sensor Error means on a Frigidaire refrigerator

The Ice Room Sensor Error on a Frigidaire refrigerator indicates a fault within the temperature sensing system located in the ice room compartment. This error triggers when the sensor reports a temperature reading outside the valid operating range, specifically above 149°F or below -58°F. Readings in these extremes are physically implausible under normal operating conditions, which tells the control board that the sensor itself, its wiring, or the signal circuit has failed rather than the actual compartment temperature being out of range.

The ice room sensor feeds temperature data to the Main PCB, and the signal travels through a specific circuit path between connector CN31 pin 3 and connector CN76 pin 1. The expected voltage on this circuit during normal operation should fall between 1.0V and 4.5V. Voltage outside this window, or no voltage at all, confirms that the control board is not receiving a valid sensor signal. This type of NTC (negative temperature coefficient) thermistor circuit produces voltage that corresponds to resistance changes as temperature shifts, so a short to ground or an open circuit will push the reading to an extreme that triggers the fault code.

Common failure points include a damaged or corroded sensor connector, a broken sensor wire, or the sensor element itself failing due to moisture exposure in the ice room environment. The Main PCB can also be responsible if the reference voltage or signal conditioning circuitry on the board has failed, though this is less common. Diagnosis should begin at the CN31 to CN76 circuit with a multimeter to confirm whether the voltage is within the 1.0V to 4.5V specification before replacing any components.

Source: manufacturer service documentation.

Common causes of Ice Room Sensor Error

  1. 01

    Failed Ice Room Temperature Sensor

    Part replacement

    The NTC thermistor sensor itself can fail due to moisture exposure, physical damage, or age, causing it to report temperatures outside the valid range. A resistance check of the sensor at a known temperature will confirm whether it has failed.

  2. 02

    Damaged or Disconnected Sensor Wiring

    Wiring / connection

    The wire harness running between the ice room sensor and the Main PCB connectors CN31 and CN76 can develop breaks, shorts, or loose connections, producing an out-of-range voltage signal. Inspect the full wire run for visible damage, pinching, or corrosion at the connector pins.

  3. 03

    Corroded or Poor Connector Contact

    Wiring / connection

    Moisture in the ice room environment can corrode the connector pins at CN31 or CN76, increasing resistance in the circuit and distorting the voltage reading. Clean or replace the affected connector if corrosion or oxidation is visible.

  4. 04

    Voltage Out of Specification at CN31 to CN76 Circuit

    Part replacement

    If the measured voltage between CN31 pin 3 and CN76 pin 1 is outside the 1.0V to 4.5V range and the sensor and wiring test correctly, the signal conditioning circuit on the Main PCB may be at fault. This points to a board-level failure requiring PCB replacement.

  5. 05

    Faulty Main PCB

    Part replacement

    In cases where the sensor and all wiring check out correctly but the error persists, the Main PCB itself may have failed internally, preventing it from reading the sensor signal accurately. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Ice Room Sensor Error

What does Ice Room Sensor Error mean on a Frigidaire refrigerator?
This error means the temperature sensor in the ice room compartment is reporting a reading above 149°F or below -58°F, which falls outside the valid operating range. Because these temperatures are not physically realistic for a refrigerator ice compartment, the error indicates a sensor, wiring, or circuit failure rather than an actual temperature problem. The Main PCB monitors the sensor signal voltage at connector CN31 pin 3 to CN76 pin 1, and a reading outside 1.0V to 4.5V triggers the fault.
Can I fix the Ice Room Sensor Error myself on a Frigidaire refrigerator?
A knowledgeable DIYer can begin by visually inspecting the ice room sensor connectors and wiring for obvious damage, corrosion, or disconnection. Confirming the voltage between CN31 pin 3 and CN76 pin 1 with a multimeter is the recommended first diagnostic step and does not require disassembling major components. Replacing the sensor is a moderate-difficulty repair, but if the Main PCB is found to be at fault, professional replacement is recommended.
Will resetting the refrigerator clear the Ice Room Sensor Error?
A power reset may temporarily clear the error code from the display, but the code will return if the underlying sensor or wiring fault has not been repaired. Resetting is useful to confirm whether the fault is intermittent, but it does not fix the root cause. Persistent reappearance of the code after a reset confirms that a component failure needs to be addressed.
Is it safe to keep using my refrigerator while the Ice Room Sensor Error is active?
The refrigerator may continue cooling, but the ice maker system may not function correctly without an accurate ice room temperature reading. There is no immediate electrical safety hazard, but continued operation without a working sensor can lead to ice maker malfunctions, including overproduction or failure to produce ice. It is best to diagnose and repair the fault promptly to avoid secondary issues.
How much does it cost to repair the Ice Room Sensor Error on a Frigidaire refrigerator?
If only the ice room temperature sensor needs replacement, parts typically cost in the range of $15 to $50, and a technician may charge $75 to $200 for the diagnostic and repair labor. If the Main PCB is the cause, the part alone can range from $100 to $300 or more depending on the model, with total repair costs potentially reaching $250 to $500 including labor. Getting a diagnostic quote before authorizing parts replacement is advisable.

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