Dishwasher displays F4E4; water may not circulate properly; sometimes only one spray arm works.

Safety First: Disconnect power and water before working under the dishwasher.

• Run diagnostics (if available): Many Whirlpool models have a service cycle that tests the diverter. Refer to your tech sheet (usually behind the toe-kick) for button sequence.
• Listen for diverter movement: During wash, you should hear periodic clicking or changes in spray pattern. If not, the diverter may be stuck.
• Inspect diverter assembly: Remove the dishwasher from the cabinet if necessary. From the bottom, locate the diverter motor attached to the sump. Check for leaks or damage.
• Check for obstructions: Remove the lower spray arm and filter, then inspect the diverter disc area in the sump for foreign objects.
• Replace diverter: If the motor does not run or the position sensor fails, replace the diverter motor/assembly as specified for your Whirlpool model.