Dishwasher does not heat water, cycle runs cold and E3 is displayed.

Safety first: Isolate the dishwasher from mains power. Heating components operate at full mains voltage.

• Confirm symptom: Run a short cycle and feel the door or tank after 5–10 minutes (carefully). If still cold and E3 appears, proceed with checks.
• Access heater: Remove the front lower panel or side panel to locate the Maidaid tank heating element and wiring.
• Check wiring: Inspect heater terminals and harness for signs of burning, loose spades, or corrosion. Reseat connectors firmly.
• Test element: Disconnect the heater leads and measure resistance across the Maidaid heating element with a multimeter. A typical reading is between 10–40 Ω depending on rating. Infinite resistance indicates a failed element.
• Check temperature probe: Locate the Maidaid NTC sensor in the tank wall. Measure its resistance at room temperature and compare with service data (commonly 10kΩ at 25°C). Replace if open, shorted, or far out of spec.
• If heater and NTC are OK: The heater relay or control PCB may be defective. This is a board-level repair and should be handled by a qualified technician.