Dishwasher displays E3; cycle may be extended and water may not heat properly.

Safety: Turn off power at the breaker before working on the heater circuit.

• Verify hot water supply: Run hot water at the sink until hot before starting the dishwasher to reduce heating time.
• Inspect heater element: Look for visible breaks or burn marks on the heater (if exposed in the tub).
• Check heater connections: From beneath the unit, ensure heater terminals are tight and free of corrosion.
• Test heater with a meter: Measure resistance across the heater. An open circuit indicates a failed element that must be replaced.

If the heater tests good but E3 persists, the control board may not be energizing the heater relay and should be diagnosed by a professional.