Display shows E3 during cooking, often when using high-temperature modes like Fry or Bake; heating stops.

Safety first: Unplug the multicooker and allow it to cool for at least 30 minutes. Do not bypass any safety devices.

• Check inner pot seating: Ensure the original Polaris inner pot is used and that it sits flat on the heating plate. Remove any debris, burnt food, or warped foil that may prevent full contact.
• Clean heating plate: Wipe the heating plate with a soft, slightly damp cloth (unit unplugged and cool). Remove burnt-on residue that can cause hot spots.
• Inspect thermal fuse/thermostat: From the underside, locate the thermal fuse or bimetal thermostat attached to the heating plate assembly. Check for discoloration or signs of overheating. Use a multimeter to test continuity; an open thermal fuse indicates it has blown.
• Replace blown thermal fuse: If the thermal fuse is open, replace it with the same temperature and current rating specified for Polaris multicookers. Crimp or solder connections using high-temperature sleeves; do not twist wires together bare.
• Ventilation check: Ensure the cooker is used on a hard, flat surface with adequate clearance around the ventilation slots. Blocked vents can cause internal overheating.
• Control board calibration: If E3 recurs with a new fuse and proper pot contact, the control board may be misreading temperature. Replacement of the main control board may be necessary.