# How to Fix Maytag Error F28 (Serial Communication)
The F28 error code is one of the most common issues that requires replacing a core electronic component in your Maytag washing machine. This guide will help you understand what the code means and how to diagnose the likely culprit.
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## Explanation: What Error F28 Means
The F28 error code on your Maytag washer signifies a **Serial Communication Failure**.
In simple terms, this means the two main electronic components that run the machine cannot “talk” to each other:
1. **The Main Control Board (CCU/MCU):** The primary computer that dictates cycles and manages functions.
2. **The User Interface Control (UI/Display Board):** The panel where you select settings and view the timer.
The signal (the electronic “handshake”) that allows these two boards to communicate has failed. This usually indicates a broken connection, a short circuit, or—most commonly—a failure within the Main Control Board itself, which is responsible for initiating and maintaining the communication loop.
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## Step-by-Step Fix: How to Diagnose and Troubleshoot F28
Because this is an electronic failure, troubleshooting involves checking power, connections, and ultimately, diagnosing which board has failed.
### Step 1: Perform a Hard Reset
Temporary glitches or power fluctuations can sometimes trigger communication errors. Always start with a complete power cycle.
1. **Unplug the Machine:** Locate the washer’s power cord and unplug it completely from the wall outlet. Do not just turn it off.
2. **Wait 5 Minutes:** Allowing a full five minutes ensures any residual electrical charge stored in the control boards is fully drained.
3. **Plug Back In:** Plug the machine back into the wall.
4. **Test:** If the error immediately reappears, proceed to Step 2.
### Step 2: Check the Communication Harness
The communication between the Main Control Board and the User Interface is carried by a wire harness (usually a ribbon cable or a bundle of wires). This harness can become loose, damaged, or corroded.
**⚠️ SAFETY WARNING: Unplug the washer before removing the top panel or accessing the rear control area.**
1. **Locate the Boards:**
* The **User Interface Control** is usually just behind the front display panel.
* The **Main Control Board** is often located inside the back panel, near the top, or sometimes accessed by removing the top lid.
2. **Inspect Connections:** Carefully trace the wire harness connecting the two boards.
3. **Secure and Inspect:** Gently disconnect and firmly reconnect the harness at both the Main Control Board and the User Interface Control. Look closely for:
* **Pinch Points:** Areas where the wire might be crushed by the chassis.
* **Corrosion:** Green or white residue on the wire pins (often caused by moisture).
* **Loose Pins:** Pins that have backed out of the plastic connector housing.
If you find damage, the harness may need replacement. If the connections look clean and secure, the problem is internal to one of the boards.
### Step 3: Determine the Failed Component
While the User Interface Board can fail, the F28 error code usually points to the **Main Control Board** as the primary culprit, especially if the connections are good. The main board is the “brain” that initializes communication. If it can’t start the electronic conversation, the F28 error is triggered.
#### Confirmation Steps (Advanced)
If you have a digital multimeter and are comfortable testing continuity (always unplug the unit first):
1. **Test the Harness Wires:** You can test the continuity of the individual wires within the communication harness. If one wire is open (no continuity), replace the harness.
2. **Conclude the Diagnosis:** If the harness is proven good (continuity is solid) and the hard reset failed, the Main Control Board must be replaced.
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## Final Solution
If resetting the machine and checking the harness connections do not resolve the F28 error, the most likely solution is replacing the Main Control Board.
**Check the price for a replacement Main Control Board here: https://www.amazon.com/s?k=Maytag+Main Control Board&tag=trivian-20**