Ice maker stops shortly after startup and displays E1 on the control panel.

Safety first: Unplug the Tristar ice maker from the wall outlet before opening any panels.

Steps to check and address E1:

• Power reset: Unplug the unit for 5 minutes, then plug back in and restart. If E1 returns, continue.
• Locate the ambient sensor: Remove the rear or side service panel (depending on model). The ambient NTC sensor is usually clipped near the air intake or condenser area and connects to the main control board with two small wires.
• Inspect wiring: Check the sensor wires for cuts, pinches, or burn marks. Ensure the connector is fully seated on the control board and free of corrosion.
• Test the sensor (if you have a multimeter): Disconnect the sensor and measure resistance. At room temperature (20–25°C / 68–77°F), most NTC sensors should read between 5–20 kΩ. If it reads open (OL) or 0 Ω, it is defective.
• Replace if faulty: If damaged or out of spec, replace with a compatible Tristar ambient NTC temperature sensor. Route the new sensor wiring away from hot components and moving parts, then reconnect to the control board.
• Reassemble and test: Reinstall the panel, plug the unit back in, and run a full ice-making cycle to confirm the error is cleared.