Safety first: Unplug the dryer and allow it to cool completely before working near the heater assembly.

Locate the NTC sensor: On Bush dryers, the NTC is usually mounted on or near the heater housing or air duct (rear or side of the drum). Remove the rear panel to access it.
Inspect wiring and connector: Check the NTC plug for secure fit, corrosion, or heat damage. Clean contacts and reseat the connector firmly.
Test the NTC with a multimeter: Disconnect the sensor and measure its resistance at room temperature. Typical values are between 5–20 kΩ depending on model. If it reads open (infinite) or near 0 Ω, the sensor is faulty and should be replaced.
Check harness continuity: If the NTC tests good, check continuity from the NTC connector back to the control PCB. Repair any broken or high-resistance wires.
Reassemble and test: After replacing or reconnecting the NTC, reassemble the rear panel, plug in the dryer, and run a warm cycle to confirm that E04 is cleared and heating is restored.
If E04 persists: The temperature sensing circuit on the main control PCB may be defective, requiring board repair or replacement by a technician.

Bush dryer displays E04 and stops heating; cycle may continue with cold air only.

Possible Causes