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Frigidaire Refrigerator Error Code IceMaker Sensor Error

Sensor system in ICE MAKER has errors such as connector missing, contact failure, electric wire cut…

Frigidaire codesFrigidaire refrigerator codes

Sensor system in ICE MAKER has errors such as connector missing, contact failure, electric wire cut, short-circuit, or sensor itself failure.

First step from the service manual

Check voltage of MAIN PCB CN90#3 <-> CN90#4: 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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  • 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 IceMaker Sensor Error means on a Frigidaire refrigerator

The IceMaker Sensor Error on a Frigidaire refrigerator indicates a fault within the ice maker's sensor circuit. This sensor monitors temperature conditions inside the ice maker to regulate the freeze and harvest cycles. When the main PCB detects an abnormal signal from this sensor, it logs the error and may disable ice production to prevent mechanical or electrical damage. The fault can stem from several root causes, all of which disrupt the communication between the sensor and the control board.

The primary diagnostic reference point is the voltage measured across pins 3 and 4 of connector CN90 on the main PCB. Under normal operating conditions, this voltage should fall between 1.0V and 4.5V. A reading outside this window points to a breakdown somewhere in the sensor circuit. The fault categories include a disconnected or improperly seated connector at CN90, poor contact at one of the terminal pins, a broken or cut wire in the harness running to the ice maker sensor, a short circuit in that wiring, or failure of the sensor component itself.

Because the error covers a range of electrical faults, a systematic approach is required. Start at the CN90 connector by measuring the voltage at pins 3 and 4 with the refrigerator powered on. If the voltage is absent or out of range, work backward through the wiring harness to check for continuity breaks or shorts before concluding the sensor has failed. Connector issues and wiring faults are more common field findings than outright sensor failure, so physical inspection of the harness routing and connector seating should precede component replacement.

Source: manufacturer service documentation.

Common causes of IceMaker Sensor Error

  1. 01

    Loose or disconnected CN90 connector

    Wiring / connection

    The connector at CN90 on the main PCB may have worked loose over time due to vibration. Check that the connector is fully seated at pins 3 and 4 and that no terminal pins are bent or retracted.

  2. 02

    Poor pin contact at the connector

    Wiring / connection

    Corrosion or physical wear on the terminal contacts at CN90 can cause intermittent or no signal from the sensor. Inspect the connector pins for oxidation, damage, or spreading, and clean or recrimp as needed.

  3. 03

    Broken or cut wiring in the sensor harness

    Part replacement

    The wire harness running from the main PCB to the ice maker sensor can develop breaks, especially at flex points or where the harness passes through panels. Use a multimeter to check continuity along the full length of the wiring.

  4. 04

    Short circuit in the sensor wiring

    Part replacement

    A short to ground or between wires in the harness will pull the voltage at CN90 pins 3 and 4 outside the normal 1.0V to 4.5V range. Inspect the harness for pinched, chafed, or melted insulation that could cause wires to contact each other or the refrigerator chassis.

  5. 05

    Failed ice maker temperature sensor

    Part replacement

    If the wiring and connectors check out correctly and the voltage at CN90 remains out of range, the sensor itself has likely failed internally. Sensor failure requires replacement of the ice maker sensor component.

See the test procedure for each cause

Frequently asked questions about IceMaker Sensor Error

What does IceMaker Sensor Error mean on a Frigidaire refrigerator?
This error indicates the control board has detected a fault in the ice maker sensor circuit. The problem can be a disconnected connector, poor pin contact, a broken or shorted wire in the harness, or a failed sensor. The main PCB monitors the sensor through pins 3 and 4 of connector CN90, where the voltage should read between 1.0V and 4.5V during normal operation. Any reading outside that range triggers this error.
Can I fix the IceMaker Sensor Error myself?
Some causes are DIY-friendly. Reseating a loose connector at CN90 or inspecting the wiring harness for visible damage requires only basic tools and careful observation. However, testing voltage at the main PCB connector and checking wiring continuity requires a multimeter and comfort working with live appliance circuits. If the sensor itself has failed, replacing it involves disassembling part of the ice maker assembly, which is manageable for experienced DIYers but may be better handled by a technician.
Is the IceMaker Sensor Error dangerous or urgent?
This error does not typically present a safety hazard to the household. It is primarily a functional issue that stops or disrupts ice production. However, a short circuit in the wiring should not be ignored, as damaged wiring can worsen over time. The refrigerator's cooling function for food storage is generally not affected by this specific error.
Will resetting the refrigerator clear the IceMaker Sensor Error?
A reset may temporarily clear the error code, but if the underlying fault in the sensor circuit has not been corrected, the error will return. Resetting is useful for confirming whether the fault is intermittent, but it is not a repair. The voltage at CN90 pins 3 and 4 should be measured and the wiring inspected before concluding the issue is resolved.
How much does it cost to repair the IceMaker Sensor Error on a Frigidaire refrigerator?
Repair costs depend on the specific fault found. If the issue is a loose connector or minor wiring repair, costs may be limited to a service call fee, typically in the range of $75 to $150. If the ice maker sensor needs to be replaced, parts costs generally range from $20 to $80 depending on the model, with labor adding to the total. A complete ice maker assembly replacement, if needed, can run $100 to $300 or more for parts alone.

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