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Error code reference

GE Refrigerator Error Code Er IS

Short or disconnection of the icing sensor (ice maker sensor)

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Short or disconnection of the icing sensor (ice maker sensor). When displayed without user input, it indicates an icing sensor error.

First step from the service manual

Check for a loose connection, then check White to Blue at CON5 on the main PCB.

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

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What Er IS means on a GE refrigerator

The Er IS error code on a GE refrigerator indicates a fault with the icing sensor, also called the ice maker sensor. This sensor monitors temperature conditions within the ice maker compartment and reports data back to the main PCB. When the control board detects either a short circuit or an open circuit (disconnection) in the icing sensor circuit, it triggers this code. The error appearing without any user input is a key indicator that the fault is genuine and not the result of a button combination or diagnostic mode entry.

The primary diagnostic starting point involves the wiring connection between the icing sensor and the main PCB. Specifically, the White and Blue wires at CON5 on the main PCB should be checked for continuity, proper seating, and signs of damage. A loose, corroded, or damaged connector at CON5 is a frequent cause of this code and should be inspected before replacing any components. If the connector checks out, the sensor itself should be tested for proper resistance to determine whether it has failed internally.

A shorted sensor will typically read near zero resistance, while a disconnected or open sensor will read infinite resistance (OL on a multimeter). Neither condition falls within the normal operating range for the icing sensor, and both will trigger Er IS. If wiring and connectors are intact and the sensor reads out of range, the icing sensor requires replacement. In some cases, damage to the wiring harness between the sensor and CON5 can cause the same fault without the sensor itself being defective.

Source: manufacturer service documentation.

Common causes of Er IS

  1. 01

    Loose or disconnected connector at CON5

    Wiring / connection

    The White to Blue wire connection at CON5 on the main PCB can work loose over time due to vibration or handling. This is the first thing to inspect, as reseating the connector may clear the error without any part replacement.

  2. 02

    Failed icing sensor

    Part replacement

    The icing sensor itself can fail internally, resulting in either a short or an open circuit. Testing the sensor with a multimeter will show near-zero resistance for a short or infinite resistance for an open, neither of which is within normal range.

  3. 03

    Damaged wiring harness

    Part replacement

    The wiring harness running between the icing sensor and CON5 on the main PCB can develop breaks, pinches, or chafe points that cause intermittent or permanent faults. Inspect the full length of the harness for visible damage.

  4. 04

    Corroded or damaged connector pins

    Wiring / connection

    Moisture in the ice maker area can corrode the connector pins at CON5 or at the sensor end of the harness, increasing resistance or breaking the circuit entirely. Look for green or white oxidation on the pins and clean or replace the connector as needed.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor and all wiring check out within normal parameters, the main PCB may have a defect affecting the CON5 input circuit. This is the least likely cause and should only be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about Er IS

What does Er IS mean on a GE refrigerator?
Er IS indicates a short circuit or disconnection detected in the icing sensor, which is the temperature sensor located in the ice maker. The main PCB monitors this sensor continuously, and when the circuit falls outside expected parameters, the code is triggered. It can appear due to a loose wiring connection, a damaged harness, or a failed sensor. The error appearing on its own without user input confirms it is a genuine fault rather than a diagnostic mode display.
How do I fix the Er IS error on my GE refrigerator?
Start by checking the connector at CON5 on the main PCB, specifically the White and Blue wires, to make sure it is fully seated and free of corrosion. If the connection looks good, test the icing sensor itself with a multimeter to check for a short or open circuit. If the sensor is out of range, it will need to be replaced. Also inspect the wiring harness between the sensor and the board for any visible damage.
Is it safe to keep using my GE refrigerator with the Er IS code?
The refrigerator's main cooling function may continue to operate even with an Er IS code, but the ice maker may not work correctly or may stop producing ice entirely. There is no immediate safety hazard to food in the main compartment in most cases, but the issue should be diagnosed and repaired promptly to prevent further complications with the ice maker system.
Will resetting my GE refrigerator clear the Er IS error code?
A reset may temporarily clear the display, but the error will return if the underlying fault is still present. Because the code reflects an actual circuit condition (a short or open in the icing sensor), the problem must be physically corrected before the code will stay cleared. Reseating the connector at CON5 or replacing a faulty sensor are the steps needed to resolve it permanently.
How much does it cost to repair the Er IS error on a GE refrigerator?
If the fix is simply reseating or cleaning the connector at CON5, there may be no parts cost at all, only labor if a technician is involved. Replacing the icing sensor typically costs between $20 and $60 for the part, plus labor if applicable. If the main PCB is ultimately the cause, board replacement can range from $150 to $350 or more depending on the model. Getting a proper diagnosis before ordering parts is recommended.

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