Why do I getF5 when I turn on my washing machine?

The F5 error code on your Whirlpool washing machine can represent one of several different issues, depending on the specific sub-code that follows it. Here are the possible F5 error codes and their meanings:

1. F5E1 - Lid Switch Fault – Lid Is Up: This error is displayed if the lid is in a locked state but the lid switch is open. This could be due to the user pressing START with the lid open, or the main control not detecting the lid switch opening and closing properly
2. F5E2 - Lid Lock Will Not Lock Or Lid Lock Failure: This error indicates a problem with the lid lock mechanism. It could be due to the lid not closing completely, interference with the lock or lock bezel, wash media buildup preventing the lock bolt from extending, or the main control detecting an open lid switch when attempting to lock
3. F5E3 - Lid Lock Will Not Unlock: This fault is displayed when excessive force on the lid is preventing the lock bolt from retracting, wash media buildup is preventing the lock bolt from retracting, or the main control cannot determine if the lid lock is in an unlocked state
4. F5E4 - Lid Not Opened Between Cycles: This error occurs when the main control cannot detect the lid switch opening and closing properly. It could be due to user error or a defective lid switch.

To provide a more precise answer, it would be helpful to know the specific sub-code (e.g., F5E1, F5E2, or F5E3) that is being displayed on your washing machine. Equally important, as @jayeff mentioned, we could use your full model number. Typically this looks like "110.********" where * is replaced by a series of 8 numbers. This will allow for a more accurate diagnosis and solution.

My best immediate guess, assuming you are using the washer properly and the simple solutions like buildup or excessive force have been ruled out, is that you will need a new lid lock switch. These are fortunately relatively cheap and straightforward to replace.