Dishwasher fills but does not heat the water; cycles take unusually long and E3 appears on the display.

Safety first: Disconnect mains power before opening any panels. Water and electricity are a dangerous combination.

• Confirm symptom: During a hot program, open the door briefly after 15–20 minutes (pause cycle first). If the water is cold and E3 appears, a heating fault is likely.
• Check wiring at base: Remove the toe-kick or side panel to access the circulation pump and heater assembly. Inspect connectors for signs of burning, corrosion, or loose fit. Reseat any loose plugs.
• Inspect NTC sensor: Locate the NTC (temperature sensor) in the sump or on the heater housing. Ensure its connector is firmly attached and free of moisture.
• Advanced testing (for experienced users): With power disconnected, measure resistance of the heater and NTC using a multimeter. A completely open heater or shorted sensor indicates replacement is needed.
• Control board check: If heater and NTC test OK, the heater relay on the main control module may be defective. This typically requires board repair or replacement.

Because the heating circuit is high-current, if you are not experienced with electrical testing, arrange service from a qualified technician.