Hi, Here is what the manufacture says about this error code and my comments will follow. SERIAL COMMUNICATION ERROR The communication between the Central Control Unit (CCU) and theMotor Control Unit (MCU) cannot be sent correctly. Possible Causes/Procedure 1. Unplug washer or disconnect power. 2. Check wire harness connections to the MCU, the motor, and Central Control Unit (CCU). ? Check connections of the CCU board within the housing. ? Make sure all grounding switches are engaged. 3. Check that the serial harness at the MCU is not mounted upside down. The wires should be to the left when facing the MCU connectors. 4. Check the drive system for any worn or failed components. 5. Plug in washer or reconnect power. 6. Verify CCU operation by running a Diagnostic Test or any cycle This type of error is going to need the services of a factory trained service person. The trouble could be in multiple locations and hard to diagnois. Sorry to be the bearer of the bad news but this one is not a simple one
Actually, this may be more simple than you think. http://www.slashdocs.com/mypwxs/8178686-maytag-epic-z-front-loading-washer-technical-education.html
I have been chasing this issue for several months. I am on my third Computer (CCU). I buy a new computer and it only lasts a month. This latest coputer only lasted a week.
An interesting thing occured to me, every time I played with the wiring on the washer, it would work for two or three loads, then my F-28 error would come back.
F-28 is a communication error. There are two computers in the washer. Central Computer and motor controller computer. There is a serial bus between them (3 wire connector on the top of the CCU with a blue stripe). From my research, I discovered that these washers have a corrosion problem. The data communication wires are susceptable to this.
One thing I noticed was that my washer seems to always quit when starting the spin cycle when the washer is really shaking.
Here's the solution:
Find that 3 wire connector and clean the contacts on both sides of the wire harness (CCU and MCU sides). This can be accomplished by running some light sandpaper between the contacts. You should also do this to the wires going to the motor sensor on the back of the motor. This solved my problem. I figure I will probably need to go in and repeat this every year or so.
I also found this awesome troubleshooting guide. It has A LOT of great information
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