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The F-28 error code means SERIAL COMMUNICATION ERROR C
The communication between the Central Control Unit (CCU) and the User Interface Board (UI) cannot be sent correctly.
When you replaced the pump did you remove the top panel? and move any wires around
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My name is Woody. I will be glad to assist you today. I have been servicing ALL Major Brands of Appliances for 35 Years, and have over 100,000 in home repairs and over 80,000 internet repairs under my belt.
When you ran the unit after you replaced the pump did you still have the lower front panel off the unit?