Whirlpool Dishwasher Error Code F9 — What It Means & How to Fix It

What Does This Error Mean?

The F9 error means your Whirlpool dishwasher has a problem with the diverter motor. The diverter directs water to the upper or lower spray arms depending on the wash cycle. If the diverter motor fails, water can't reach all the spray arms and dishes won't get clean. This is a moderate error — the dishwasher is not dangerous but won't clean properly.

Affected Models

WDT750SAHZ
WDT970SAHZ
WDTA50SAHZ
WDF520PADM
Many Whirlpool dishwasher models

Common Causes

Diverter motor has burned out or seized and can no longer rotate
Foreign object (glass shard, food debris) blocking the diverter valve
Wiring harness connecting the diverter motor to the control board is loose or damaged
Diverter disk is cracked or warped, preventing smooth rotation
Control board sending incorrect signals to the diverter motor

How to Fix It

Cancel the cycle and press Power to turn off the dishwasher.

Allow the machine to fully stop before opening the door. If water is present, let it drain or cancel the cycle first.
Remove the bottom rack and check the lower spray arm.

Spin the lower spray arm by hand. It should turn freely. If it's stiff or won't spin, something may be blocking the diverter area below.
Remove the filter assembly and look into the sump area.

With the filter removed, look for visible debris or glass fragments around the diverter disk at the bottom. Carefully remove anything you find.
Unplug the dishwasher for 10 minutes and perform a power reset.

A reset can clear F9 errors caused by a temporary motor stall or communication glitch. Try running a short cycle after the reset.
If F9 returns after a reset and clear filter, call a technician.

The diverter motor itself has likely failed. A technician can confirm this with a resistance test and replace the motor assembly.

When to Call a Professional

The diverter motor is located at the bottom of the dishwasher sump area. Accessing it requires removing the lower spray arm and filter assembly. While some experienced DIYers can replace it, most homeowners prefer a technician. Expect repair costs of $100–$250 for a diverter motor replacement.

Frequently Asked Questions

What does the diverter do in a dishwasher?

The diverter is a valve and motor assembly in the bottom of the sump. It controls which spray arms receive water at any given moment in the cycle. Some cycles spray only the lower arm, others spray the upper arm, and some alternate. The diverter motor rotates a disk to open and close these water pathways. If it fails, water either always goes to one arm or to none at all — leaving dishes dirty.

Can I run the dishwasher with an F9 error?

Technically the machine may still run, but dishes won't clean properly. If the diverter is stuck in one position, only the upper or lower rack will get water. For occasional use in an emergency, this is low-risk. But for reliable cleaning and to prevent further motor damage, fix the F9 error promptly.

How do I know if the diverter disk is cracked?

Remove the filter assembly and look straight down into the sump with a flashlight. The diverter disk is a flat plastic disc that you may be able to see or feel. A cracked disk often has visible fracture lines or chips around the edges. If you find cracks, the diverter disk assembly needs replacing — this is usually done alongside the motor.