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I have a LG washer and dryer and mine get a PF code for power failure. I don't know if that's helpful or not. Contact the manufacturer for information on what the different codes mean. You can also look at the booklets that came with your machine. A lot of times, manufacturers will have the user manual online at their site.
What the F28 error code means is "serial communaction error" to put that in simple terms it says the main control board isn't talking to the motor control board. What would need to checked when the F28 code is displayed is for good tight wire connection on all the wiring harnesses between the main and motor control boards, if all the wiring plugs fit tight onto both control board while i hardly advise this and belive in the you can do it byself spirit it advise, ya call for service so the operation of both control boards can be checked to see which on has failed.
F28 is a serial bus error from the CCU (Central Control Unit) to the MCU (Motor Control Unit).
All you need is some Electronics contact cleaner spray and a 1/4 inch socket to remove the top of the machine and the back of the machine. The CCU is the computer looking box at the top front right hand corner. Find connector M13, (has red marking on it and only 3 wires) disconnect it by pushing the retainer tab back and pulling gently on the connector. Spray the contacts of the connector and computer with connector cleaner. Then re-assemble connector. The MCU is in the back lower left corner. Find the connector with 3 wires and red mark, and remove this connector in the same way you did the other, spray it and re-install. Put the back and top back on.
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F28 is a communication error which usually means there is a connection that has come loose. Removing the top and unpplugging and replugging the connectors in will fix 75% of these codes. If the bottom toe panel is not on it will also give you an F28.