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Error code reference

Frigidaire Refrigerator Error Code Er IS

Icing sensor error caused by short or disconnection of the icing sensor.

Frigidaire codesFrigidaire refrigerator codes

Icing sensor error caused by short or disconnection of the icing sensor.

First step from the service manual

Check disconnection of each sensor wire.

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
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What Er IS means on a Frigidaire refrigerator

The Er IS error code on a Frigidaire refrigerator indicates a fault in the icing sensor circuit. The icing sensor monitors ice or frost accumulation conditions within the refrigerator system, and this code is triggered when the control board detects either a short circuit or an open circuit (disconnection) in the sensor wiring or the sensor itself. The control board continuously reads the sensor's electrical signal, and any deviation outside the expected parameters will register as this fault.

The most common causes are loose or corroded wire harness connections at the sensor or control board, physical damage to the sensor wiring, or a failed icing sensor. A short circuit means two conductors in the sensor circuit are making unintended contact, driving resistance abnormally low. A disconnection or open circuit means the electrical path is broken, which drives resistance abnormally high or eliminates the signal entirely. Both conditions prevent the control board from receiving a valid reading.

Diagnosing this fault begins with a physical inspection of every wire connected to the icing sensor. Technicians should check for pulled connectors, pinched or broken wire insulation, and signs of moisture intrusion or corrosion at the connector pins. If all wiring checks out visually and mechanically, the sensor itself should be tested for proper resistance at its operating temperature range. A sensor reading outside its specified range confirms the sensor requires replacement.

Source: manufacturer service documentation.

Common causes of Er IS

  1. 01

    Disconnected sensor wire connector

    Wiring / connection

    The wire harness connector at the icing sensor or control board may have come loose. Inspect each connector along the sensor wire path and firmly reseat any that appear loose or partially unplugged.

  2. 02

    Damaged or broken sensor wiring

    Part replacement

    The sensor wiring can become pinched, frayed, or broken, especially near mounting points or door hinges. Carefully trace the full length of the wire and look for visible damage to the insulation or conductors.

  3. 03

    Corroded or dirty connector pins

    Wiring / connection

    Moisture inside the refrigerator can cause oxidation at the sensor connector pins, increasing resistance and disrupting the signal. Inspect the connector terminals for discoloration or buildup and clean with an appropriate electrical contact cleaner.

  4. 04

    Failed icing sensor

    Part replacement

    The icing sensor itself may have failed internally, resulting in a short or open circuit at the component level. If wiring and connectors are intact, the sensor should be tested for correct resistance and replaced if it reads outside specification.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board may incorrectly report an Er IS code due to a board-level fault affecting the sensor input circuit. This should only be considered after all wiring and the sensor itself have been confirmed good.

See the test procedure for each cause

Frequently asked questions about Er IS

What does Er IS mean on a Frigidaire refrigerator?
Er IS stands for an icing sensor error. It means the control board has detected either a short circuit or a disconnection in the icing sensor circuit. This prevents the refrigerator from receiving a valid signal from that sensor. The fault can originate in the wiring, the connector, or the sensor itself.
How do I fix the Er IS error on my Frigidaire refrigerator?
Start by inspecting every wire and connector associated with the icing sensor for looseness, damage, or corrosion. Reseat any loose connectors firmly. If the wiring looks intact, test the sensor's resistance to determine whether the sensor has failed. Replace any damaged wiring harness sections or the sensor itself as needed.
Is it safe to keep using my refrigerator while the Er IS code is displayed?
A faulty icing sensor can affect how the refrigerator manages frost and temperature conditions, which may impact food preservation over time. While the unit may continue running, it is best to diagnose and resolve the fault promptly. Leaving a sensor circuit fault unaddressed can sometimes lead to secondary issues such as excess ice buildup or temperature inconsistencies.
Will resetting my Frigidaire refrigerator clear the Er IS code?
A power reset may temporarily clear the code from the display, but the error will return if the underlying fault in the icing sensor circuit has not been corrected. A reset is useful for confirming whether the fault is persistent, but it is not a fix. The wiring and sensor must be inspected and repaired or replaced to permanently resolve the error.
How much does it cost to repair an Er IS error on a Frigidaire refrigerator?
Repair costs vary depending on the root cause. If only a connector needs reseating or cleaning, there may be no parts cost, and a service call fee would be the primary expense. Replacing the icing sensor itself is typically a low to moderate cost repair, with parts generally ranging from around $15 to $60 depending on the model, plus any labor charges if a technician is used.

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