Washer does not heat water, cycle takes unusually long or stops with E05

Safety first: Unplug the washer and allow it to cool before accessing internal components.

Step-by-step checks:

• Access the heater: On most Blomberg washers, the heater is located at the bottom of the tub, accessible from the rear panel. Remove the back cover to expose the heater terminals and NTC sensor.
• Test the heating element: Disconnect the heater wires. Measure resistance across the heater terminals with a multimeter. Typical values are around 20–30 Ω (check service data for your model). Infinite resistance indicates a failed element that must be replaced.
• Check for earth leakage: Measure resistance between each heater terminal and the metal tub/ground. Any low resistance (under several megaohms) suggests insulation breakdown; replace the heater.
• Test NTC sensor: Disconnect the NTC plug and measure resistance at room temperature. It should be within the range specified for Blomberg sensors (often 4–20 kΩ depending on type). If reading is open, shorted, or does not change when warmed gently, replace the NTC.
• Inspect wiring and board: Look for burned connectors at the heater and on the control board. Reseat connectors firmly. If heater and NTC are good but E05 persists, the heater relay on the main PCB may be defective and the board may need repair or replacement.