Dishwasher displays E3 and stops; water inside is cold and dishes are not getting clean.

Safety first: Turn off power at the breaker. The heater and wiring can be live and hot.

• Confirm water supply temperature: Run hot water at the kitchen sink until it is hot. Zline dishwashers perform best with 120°F (49°C) inlet water.
• Inspect heating element: Access the bottom of the tub (inside) and visually inspect the exposed heater (if present) or the concealed base heater for cracks, burn marks, or warping.
• Check wiring connections: Remove the lower front panel and locate the heater terminals. Look for loose spade connectors, discoloration, or melted insulation. Tighten or replace connectors as needed.
• Test heater resistance: With power off, disconnect heater leads and measure resistance with a multimeter. An open circuit (infinite resistance) indicates a failed element that must be replaced.
• Evaluate temperature sensor: If the heater tests good, locate the NTC sensor (usually in the sump area). Check for secure connection and visible damage. Replace if out of spec per service manual values.