E7 error appears; ice maker may not detect water correctly or may stop with water still in the reservoir.

Safety first: Unplug the unit and drain water before accessing the pump.

Steps to resolve E7:

• Check water level and quality: Ensure the reservoir is filled with clean, filtered water. Very low water or heavy mineral content can cause flow issues.
• Inspect the pump inlet filter: Remove the ice basket and top cover to access the water tray and pump area. Many Costway units have a small mesh screen at the pump inlet—clean any debris or scale.
• Bleed air from the system: After cleaning, refill the reservoir and tilt the unit slightly backward and forward to help release trapped air bubbles from the pump.
• Check pump wiring: Locate the circulation pump (usually near the reservoir bottom) and verify its connector is firmly attached to the control board harness.
• Test pump operation: With the unit reassembled, plug it in and start a cycle. Listen for the pump running and watch for water flowing over the evaporator grid. If silent or weak, the pump may be failing.
• Replace defective pump: Remove mounting screws, disconnect hoses (have towels ready), and install a new Costway water circulation pump with the same flow rating. Reconnect hoses securely to prevent leaks.