Error code reference

Electrolux Refrigerator Error Code SY CF

Communication was not established between UI and Main Board at power up.

Electrolux codesElectrolux refrigerator codes

Communication was not established between UI and Main Board at power up.

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What SY CF means on a Electrolux refrigerator

SY CF is a communication fault code indicating the main control board failed to establish a data link with the user interface (UI) board during the power-up initialization sequence. This handshake between the two boards happens every time the refrigerator powers on. When the main board does not receive a valid response from the UI board within the expected window, it logs SY CF and may disable normal operation. The fault points to the communication pathway between these two boards, which includes the wiring harness connecting them, the connectors at each end, and the boards themselves.

For homeowners, the UI board is the control panel you interact with to set temperatures and select modes. The main board is the central controller mounted inside the refrigerator cabinet. These two components constantly talk to each other, and SY CF means that conversation never started after the unit powered on. This can happen after a power outage, a power surge, or when a connection has corroded or come loose over time.

Because the fault occurs specifically at power-up, a simple reset sometimes clears it if the cause was a temporary voltage irregularity. If the code returns after unplugging the unit for a few minutes and restoring power, a physical component or wiring issue is likely responsible and will need to be diagnosed and repaired.

Source: manufacturer service documentation.

Common causes of SY CF

  1. 01

    Loose or disconnected wiring harness between UI board and main board

    Wiring / connection

    The ribbon cable or wire harness carrying communication signals between the two boards can work loose over time, especially after moving the appliance or following a power event. A disconnected or partially seated connector breaks the communication link entirely at power-up.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Moisture inside the refrigerator cabinet can corrode the pins on the harness connectors at either the UI board or main board end, increasing resistance or breaking the signal path. Corroded pins may show intermittent faults that become permanent as corrosion worsens.

  3. 03

    Failed user interface (UI) board

    Part replacement

    If the UI board has failed due to a power surge, moisture damage, or component wear, it cannot respond to the main board during the initialization handshake, triggering SY CF. A failed UI board will not recover with resets and requires replacement.

  4. 04

    Failed main control board

    Part replacement

    Less commonly, the main board itself may be unable to initiate or process the communication sequence due to internal component failure. This is typically the last component suspected after the harness and UI board have been ruled out.

See the test procedure for each cause

Frequently asked questions about SY CF

What does SY CF mean on an Electrolux refrigerator?
SY CF means the main control board could not establish communication with the user interface (UI) board when the refrigerator powered on. The two boards failed to complete their startup handshake. This points to a wiring, connector, or board-level problem in the communication path between the control panel and the main board.
How do I fix SY CF on an Electrolux refrigerator?
Start by unplugging the refrigerator for 5 minutes, then restoring power to see if the code clears. If it returns, inspect the wiring harness running between the UI board and the main board, checking that all connectors are fully seated and free of corrosion. If the connections are intact and the code persists, the UI board is the most common component to fail and should be tested or replaced. If replacing the UI board does not resolve it, the main board is the next suspect.
Is it safe to keep using my Electrolux refrigerator when SY CF is showing?
When SY CF is active, the refrigerator may not respond correctly to temperature settings and the UI may not display accurate information, meaning you cannot reliably monitor or control the unit. Food safety becomes a concern if cooling is not operating properly. Do not rely on the refrigerator to maintain safe food temperatures until the fault is diagnosed and cleared.
How much does it cost to fix an Electrolux refrigerator SY CF error?
If the issue is only a loose harness connector, there is no parts cost and the repair takes only a few minutes. A replacement UI board for Electrolux refrigerators typically costs between $80 and $200 depending on the model, plus labor if you use a technician. A main control board replacement generally runs $150 to $350 in parts. Professional diagnostic and repair labor typically adds $100 to $200 depending on your area.
Will unplugging my Electrolux refrigerator fix the SY CF code?
A power reset clears SY CF if the cause was a temporary voltage irregularity at startup, such as a brownout or power surge. Unplug the unit for at least 5 minutes before restoring power. If the code comes back immediately or after a short time, the reset did not address the underlying problem and a physical inspection of the wiring harness and boards is needed.

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