E9 appears; ice cubes may be too small, too large, or the cycle ends prematurely.

Safety first: Unplug the ice maker before reaching into the ice-making chamber.

Steps to resolve E9:

• Locate the thickness probe: In the ice-making chamber, find the metal or plastic sensor arm/probe that detects ice thickness near the evaporator plate.
• Clean the probe: Use a soft cloth and a food-safe descaling solution (or vinegar/water mix) to remove mineral deposits from the probe surface.
• Check alignment: Ensure the probe is positioned correctly relative to the evaporator plate as specified in the Tristar manual. Gently bend or adjust only if the design allows.
• Inspect wiring: Trace the probe wires back to the control board. Confirm there are no cuts or loose connectors.
• Replace sensor if needed: If cleaning and alignment do not resolve the issue, install a new Tristar ice thickness sensor / probe.
• Reassemble and test: Restore power and run several cycles, checking that cube size is consistent and E9 does not reappear.