Whirlpool Dishwasher Error Code 4-2

Error code 4-2 means the control board has detected a stuck key in the keypad or a fault in the keypad connection. The control monitors every button input continuously, and when a key registers as stuck in the pressed position, it stops the dishwasher and displays this code. The issue is with the user interface panel rather than the wash motor or pump, despite how the code is labeled.

The dishwasher will typically not operate normally while error code 4-2 is active, as the control halts operation when it detects a stuck key. You should not attempt to force a cycle while the fault is present. Disconnect power until the cause is identified and corrected to avoid any unintended operation from a stuck button triggering a cycle on its own.

A power reset may temporarily clear the code if the fault was caused by a transient electrical glitch, but if a button is physically stuck or the keypad connection is loose, the error will return as soon as the dishwasher powers back on and scans the keypad. Resetting without addressing the underlying cause is not a permanent fix. Inspect the keypad and connector as described in the diagnostic steps to resolve the root cause.

Many cases of error code 4-2 can be addressed without a technician. Start by pressing each button firmly and releasing it to check for any that feel sticky or unresponsive. If a stuck button is not obvious, disconnecting power and reseating the keypad ribbon cable connection inside the door panel is a reasonable next step for a confident DIYer. Replacing the keypad membrane is also a straightforward repair if the cable and connector are found to be intact.

Repair costs vary depending on which component has failed. A replacement keypad membrane typically falls in the range of $20 to $80 for the part alone. If the control board or LCD display module requires replacement, parts costs can range from $80 to $250 or more, with additional labor costs if a technician performs the repair. Reseating a loose ribbon cable connection costs nothing beyond your time if no parts are damaged.