Dishwasher shows F5 and may stop with poor spray performance.

Safety first: Turn off power before removing spray arms.

• Clean spray arms: Remove upper and lower spray arms. Rinse under running water and use a toothpick to clear blocked jets.
• Check for free rotation: Reinstall spray arms and spin them by hand to ensure they rotate freely and do not hit dishes.
• Clean filters: Ensure filters and sump are clean to allow full pump flow.
• Run a hot cycle: Use a dishwasher cleaner to remove internal grease that can affect circulation.
• Persistent F5: The circulation pump or diverter valve may be failing and should be inspected by a technician.