E8 error appears and the cooker stops heating; often occurs during long cooking cycles.

Safety first: Unplug the cooker and allow it to cool. Do not add cold water to a very hot dry pot; it may warp.

• Check food and liquid level: Open the lid and inspect the contents. If the pot is nearly dry or food is heavily burnt on the bottom, remove the inner pot and soak it separately.
• Clean heating plate: After cooling, wipe the heating plate to remove any burnt residue. Do not use abrasive tools that can scratch the plate.
• Verify minimum liquid: When using pressure or long cooking programs, always maintain the minimum liquid level specified in the Polaris manual (often 1–2 cups).
• Inspect overheat sensor: From the underside, check the overheat thermostat or thermal fuse for signs of repeated tripping. If the thermostat is deformed or the fuse is open, replace with the correct Polaris-rated component.
• Test with water only: After cleaning, run a short program with only water to confirm that E8 does not reappear under normal conditions.