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

Safety first: Turn off power at the breaker and close the water supply. Heating components operate at mains voltage.

• Confirm symptom: During a wash cycle, open the door briefly after 15–20 minutes (pause first if your Becken model has a pause button). If the water is cold and E3 later appears, suspect the heater circuit.
• Check wiring access: Remove the lower front kick plate or side panel to access the heater assembly (often integrated into the circulation pump on Becken dishwashers). Inspect connectors for signs of burning or looseness.
• Visual inspection: Look for corrosion or leaks around the heater housing that may have damaged terminals.
• Advanced test (experienced users only): With the appliance unplugged, use a multimeter to measure resistance across the heater terminals. A typical value is 20–30 Ω; infinite resistance indicates an open heater. Also check the NTC sensor (usually 10–50 kΩ at room temperature).
• Control board check: If heater and sensor test good, the heater relay on the main PCB may be faulty. This requires board repair or replacement.

Because of shock risk and the need for accurate testing, heater circuit repairs should generally be carried out by a professional.