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If you are see "f" followed by "2". This has been the code for a problem with the keypad membrane. It's often referred to as a stuck key.
You would check voltage to the board. Then, remove the board, examine it for any problems, check that the board and keypad were connect securely and all other connections there. The keypad may have to be replaced.
The boards can become confused and report an error code when none trully exists. This happens when you have a brown out or black out. So, we would recommend that the machine be unplugged for a few hours. Sometimes, this will clear the board.
Let me know if you would like more information.