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F99 error is an internal interface control board error. If unplugging the unit won't reset the issue, the front interface control board has just failed and would need to be replaced I'm sorry to say. This is the board that all the buttons on the control panel affect when you push them.
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Either will work.
F28 is a communication error between the main board and the motor control board. If the CCU is new then that isn't going to be your problem, that would be a bad motor control board.