Whirlpool Washer Error Code F99

F99 means the washer detected an unsupported cycle selection, indicating a mismatch between the User Interface board and the Central Control Unit (CCU). The two control boards are either running incompatible software versions or the CCU has a corrupted EEPROM. The washer cannot complete the requested cycle until the control boards are re-paired or replaced.

A basic power reset, such as unplugging the washer for a few minutes, is unlikely to permanently clear F99 because the underlying cause is a software mismatch or EEPROM corruption rather than a temporary glitch. The correct reset procedure is the Service Cycle pairing process. If that does not resolve it, the fault will continue returning until the faulty control board is replaced.

If the Service Cycle pairing procedure resolves the fault, there is no parts cost, though a service call fee may apply if a technician performs the procedure. If a User Interface board replacement is needed, parts and labor typically range from around $150 to $350. CCU replacement can range from approximately $200 to $450 depending on the model and labor rates in your area.

Yes, in many cases the F99 fault can be resolved without replacing any parts by performing the Service Cycle procedure, which re-pairs the UI and CCU software. If the error clears after that procedure, no parts are needed. If the fault returns or does not clear, part replacement will be required.

The F99 error is a control communication fault, not a safety-critical failure involving water, heat, or mechanical hazards. However, the washer will not operate normally while this fault is active. It is best to avoid attempting to run cycles until the issue is diagnosed and resolved to prevent potential stress on other components.