E9 appears, unit may start filling but stops before freezing, or cycles erratically.

Safety first: Disconnect power before accessing internal water components.

Step-by-step:

• Descale the water circuit: Empty the reservoir, then fill with a mixture of water and food-safe descaler or white vinegar (per manufacturer guidelines). Run a cleaning cycle if available, or run a short ice cycle and then drain. Rinse thoroughly with clean water.
• Check water distribution tube: Inspect the water spray bar or distribution tube above the evaporator. Remove and clean any mineral deposits or debris blocking the holes.
• Bleed air from pump: After refilling, tilt the unit slightly forward and backward (while unplugged) to help remove trapped air from the pump and hoses.
• Listen to pump: During operation, the pump should run smoothly. Loud buzzing without water movement suggests a failing pump.

When to call a technician: If E9 persists after thorough cleaning and bleeding, the water pump may need replacement.