Dishwasher does not heat water; cycles run cold and may take longer than normal, E3 is displayed.

Safety first: Unplug the appliance. Heating components operate at mains voltage.

Step-by-step checks:

• Confirm symptom: After 15–20 minutes of a wash cycle, open the door carefully. If the water and interior are cold and E3 appears, suspect the heater circuit.
• Inspect wiring: Remove the side or bottom panels to access the flow-through heater assembly (common on Vestel dishwashers). Check connectors for discoloration, melting, or loose terminals.
• Test heater element: Disconnect the heater terminals and measure resistance with a multimeter. Typical values are 20–30 Ω; an open circuit indicates a failed heater.
• Check NTC sensor: The NTC is usually clipped into the sump or heater housing. Measure its resistance at room temperature and compare with Vestel service data; a reading of 0 Ω (short) or infinite (open) means replacement is required.
• Control board relay: If heater and NTC test good, inspect the main control board for a burnt heater relay or damaged solder joints. This repair is advanced; replacement of the PCB is usually recommended.

Replace any failed component with a Vestel-compatible heater or NTC sensor. If unsure about live-circuit diagnostics, contact a qualified technician.