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Error code reference

Electrolux Freezer Error Code UI

Incorrect user interface board detected.

Electrolux codesElectrolux freezer codes

Incorrect user interface board detected.

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What UI means on a Electrolux freezer

The UI error code on an Electrolux freezer indicates that the main control board has detected an incompatible or unrecognized user interface board. The user interface board is the control panel assembly that handles input signals from buttons or touch controls and communicates operational data to the main control board. These two boards exchange identification and communication signals during startup and operation, and when the main board cannot confirm a valid match, it triggers the UI fault code.

This mismatch condition most commonly occurs when a replacement user interface board is installed that does not correspond to the correct part number for that specific freezer model. It can also arise from a communication failure between the two boards caused by a damaged wiring harness, a loose or corroded connector, or a failed ribbon cable connecting the interface panel to the control board. In some cases, a main control board fault can cause it to misread a valid interface board as incompatible.

Diagnosing this error requires confirming the part number on the installed user interface board matches the model-specific requirement, then inspecting all wiring and connectors between the interface board and the main control board for continuity, damage, or poor seating. If the wiring checks out and the board part number is correct, the main control board itself may need replacement. Power cycling the unit will not resolve a true board incompatibility, though it may temporarily clear a communication glitch.

Source: manufacturer service documentation.

Common causes of UI

  1. 01

    Incorrect replacement UI board installed

    Part replacement

    If the user interface board was recently replaced, the installed part may not be the correct model-specific version. The main control board checks the identity of the UI board and will trigger this code if it does not recognize it.

  2. 02

    Loose or disconnected wiring harness

    Wiring / connection

    The connector or ribbon cable linking the user interface board to the main control board may be partially unseated or damaged, causing intermittent or failed communication. Inspect all connectors for firm seating and check for bent or broken pins.

  3. 03

    Corroded or damaged connector contacts

    Wiring / connection

    Moisture or oxidation on the connector contacts between the UI board and the main control board can degrade the communication signal enough to trigger an incompatibility fault. Visual inspection and cleaning of contacts may resolve this.

  4. 04

    Faulty user interface board

    Part replacement

    The existing UI board may have failed internally, causing it to transmit incorrect identification signals to the main control board. This can occur even without a prior repair if the board has experienced a component failure.

  5. 05

    Failed main control board

    Part replacement

    A defective main control board may incorrectly reject a valid and compatible user interface board. This is less common but should be considered after the UI board and all wiring have been confirmed as correct.

See the test procedure for each cause

Frequently asked questions about UI

What does UI mean on a Electrolux freezer?
The UI error code means the main control board has detected an incorrect or unrecognized user interface board. This is a board compatibility or communication fault. It commonly occurs after a parts replacement using the wrong board, or due to a wiring or connector problem between the two boards. The freezer may not operate normally until the issue is resolved.
Can I fix the UI error on my Electrolux freezer myself?
Some causes of the UI error are DIY-accessible, such as reseating a loose wiring harness connector or cleaning corroded contacts. However, if the error is caused by an incorrect or failed board, replacing the user interface board or main control board requires basic appliance repair skills and comfort working with electrical components. Always unplug the freezer before inspecting or handling any internal boards or wiring.
Is it safe to keep using my Electrolux freezer while the UI error is showing?
A UI error indicates a control system fault, and the freezer may not regulate temperature reliably while this code is active. Continuing to store food in a freezer displaying this error carries a risk of improper cooling without any visible warning. It is best to resolve the error before relying on the unit for food storage.
How much does it cost to repair a UI error on an Electrolux freezer?
If the fix involves only reseating a connector, there is no parts cost. A replacement user interface board typically costs in the range of $50 to $150 depending on the model. A main control board replacement can range from $100 to $300 or more for parts alone. Adding professional labor will increase the total repair cost.
Will resetting my Electrolux freezer clear the UI error code?
A power reset by unplugging the freezer for a few minutes may temporarily clear the code if the fault was caused by a transient communication glitch between boards. However, if the underlying cause is an incompatible board or a hardware failure, the UI error will return after power is restored. A reset alone is not a fix for a true board mismatch or wiring fault.

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