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Error code reference

Maytag Dryer Error Code F4

CCU is not receiving communications from UI (cycles and price display disabled while error persists or is…

Maytag codesMaytag dryer codes

CCU is not receiving communications from UI (cycles and price display disabled while error persists or is manually cleared).

First step from the service manual

Check communication wiring between CCU and UI boards; manually clear diagnostic code after correction.

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

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What F4 means on a Maytag dryer

The F4 error code on a Maytag dryer indicates a communication failure between the Central Control Unit (CCU) and the User Interface (UI) board. The CCU is the main control board that manages dryer operation, while the UI board handles the cycle selection display and user input controls. When the CCU stops receiving data signals from the UI board, it triggers F4 and disables cycle selection and price display functions for as long as the error is active or until it is manually cleared.

This communication link between the two boards typically runs through a dedicated wiring harness with plug connectors at each end. The most common root causes are loose or corroded connector pins, damaged wiring in the harness, or a partial break in a wire caused by repeated flexing or pinching during installation. In some cases, a failed UI board or CCU can also produce this fault if the hardware itself can no longer send or receive the communication signal.

Diagnosing F4 starts with a thorough inspection of the communication wiring and connectors between the CCU and UI. Technicians should check for secure seating at both connectors, inspect the harness for cuts, burns, or chafing, and test for continuity through each wire in the communication path. Once the underlying wiring or component issue is corrected, the diagnostic code must be manually cleared from the CCU before normal dryer operation and display functions will resume.

Source: manufacturer service documentation.

Common causes of F4

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The harness connector at either the CCU or UI board may have worked loose over time. Check both ends of the communication harness for a fully seated, locked connection.

  2. 02

    Damaged or broken communication wiring harness

    Part replacement

    Wires in the harness can develop breaks or shorts from pinching, flexing, or heat exposure. Inspect the full length of the harness for visible damage and test each wire for continuity.

  3. 03

    Corroded or burned connector pins

    Part replacement

    Moisture or heat can corrode the pins inside the harness connectors, increasing resistance and interrupting the communication signal. Look for discoloration, pitting, or residue on the pin contacts at both boards.

  4. 04

    Failed User Interface (UI) board

    Part replacement

    If the wiring harness checks out and connections are secure, the UI board itself may have failed and can no longer transmit signals to the CCU. A board that shows no response or visible burn marks is a strong indicator of component failure.

  5. 05

    Failed Central Control Unit (CCU)

    Part replacement

    Less commonly, the CCU may be unable to receive communications due to internal failure. This is typically considered after ruling out wiring faults and a defective UI board.

See the test procedure for each cause

Frequently asked questions about F4

What does F4 mean on a Maytag dryer?
F4 on a Maytag dryer means the Central Control Unit (CCU) is not receiving communication signals from the User Interface (UI) board. This causes the cycle selection and display functions to be disabled until the error is resolved. The problem is rooted in the communication wiring or one of the two control boards. The error must be manually cleared after repairs are made.
Can I fix an F4 error on my Maytag dryer myself?
If you are comfortable working around appliance electronics, you can start by inspecting and reseating the wiring harness connectors between the CCU and UI board, which requires no parts and costs nothing. If the wiring or connectors look damaged, or if the error returns after reconnecting everything securely, component replacement is likely needed and a qualified technician may be the safer option. Always unplug the dryer before inspecting any internal wiring.
Is it safe to keep using my Maytag dryer while F4 is showing?
The F4 code disables cycle selection and display functions, which means the dryer may not operate normally or accept user input while the fault is active. Continuing to use the dryer in this state is not recommended, as the root cause of the communication failure has not been addressed. It is best to resolve the error before resuming regular use.
Will resetting my Maytag dryer clear the F4 error?
A simple power reset is unlikely to permanently clear F4 because the code is tied to an ongoing communication failure between the CCU and UI board. The underlying wiring or component issue must be corrected first. After the repair is made, the diagnostic code needs to be manually cleared through the dryer's diagnostic mode before normal operation will resume.
How much does it cost to repair a Maytag dryer F4 error?
Repair costs depend on the cause of the communication failure. If the fix is simply reseating a loose connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing a wiring harness or UI board can bring the total to $150 to $350 or more, depending on parts pricing and labor rates in your area. CCU replacement tends to be the most expensive repair in this diagnostic path.

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