E4 displayed, ice maker stops and may show signs of frost or ice buildup around the mechanism.

Safety first: Disconnect power before testing heater circuits. Risk of electric shock and fire if shorted components are left in service.

• Step 1 – Visual inspection: Remove the ice bin and inspect the ice maker area for melted plastic, scorch marks, or exposed wires.
• Step 2 – Test heater and fuse: With the ice maker disconnected, use a multimeter to check continuity across the heater and any inline thermal fuse. A shorted heater (very low resistance) or open fuse indicates failure.
• Step 3 – Inspect wiring: Look for insulation rubbed through where the harness passes near metal edges.
• Step 4 – Replace components: Replace the Fisher & Paykel ice maker assembly if the heater or fuse is defective. Repair or replace any damaged wiring.

Do not bypass thermal fuses. After repair, restore power and monitor for normal operation without reoccurrence of E4.