Whirlpool Washer Error Code F18

F18 on a Whirlpool washer means the machine detected excessive suds (foam) during the wash cycle and could not successfully drain the water or complete the spin cycle after several attempts. The washer stops to prevent a soapy overflow or mechanical damage. The most common cause is using too much detergent or a non-HE detergent in a high-efficiency machine. Drainage problems such as a kinked hose or clogged pump can also trigger this code.

You should not force the washer to run while F18 is active, as the machine has already stopped the cycle to protect itself and your home from a potential soapy overflow. Continuing to run cycles without addressing the root cause can stress the drain pump and motor. Resolve the detergent or drainage issue before resuming normal use.

If the issue is simply detergent-related, the fix costs nothing beyond adjusting your detergent habits. Cleaning a clogged hose or filter is also a no-cost or very low-cost repair. If a drain pump replacement is needed, parts typically range from $30 to $100 depending on the model, and professional labor can add another $75 to $200 to the total depending on your location and the technician.

Start by confirming you are using HE-labeled detergent in the correct amount for your load size. If detergent is not the issue, inspect the pump hose behind the machine for kinks or clogs and clean the drain pump filter if accessible. Running an empty cleaning cycle can help clear soap residue from the tub and internal components. If the error persists after these steps, the drain pump itself may need to be tested or replaced.

Resetting the washer by unplugging it for a few minutes may clear the displayed code temporarily, but the F18 fault will return if the underlying problem is not corrected. If excessive suds or a drain restriction caused the error, those conditions need to be addressed directly. A reset alone is not a fix and should only be used after the root cause has been resolved.