Smeg Dishwasher Error E04

⚡ Quick Answer: The Smeg Dishwasher E04 error indicates a fault with the temperature sensor, which may be disconnected or malfunctioning. This error is often seen whe... ✅ DIY Fixable

What Does Error E04 Mean?

The Smeg Dishwasher E04 error indicates a fault with the temperature sensor, which may be disconnected or malfunctioning. This error is often seen when the dishwasher stops at the start of a cycle, struggles to monitor or regulate water temperature, or halts due to sensor issues. Unusual noises may accompany the malfunction, highlighting the need for inspection and potential repair of the temperature sensor or its wiring.

Common Symptoms:

  • Dishwasher stops and displays E04 at start of a cycle
  • Inability to properly monitor or regulate water temperature
  • Cycles halt due to sensor-related fault

Possible Causes

  • Temperature sensor (thermistor) fault or disconnected (medium)

How to Fix Error E04

DIY Fix Basic checks and reset

  1. Turn off and disconnect the dishwasher from mains power completely.
  2. Wait a few minutes and restore power to see if the error clears.
  3. Ensure the dishwasher has been installed correctly and there are no recent electrical interventions around the temperature sensor wiring.

Technician Only Inspect and repair/replace temperature sensor

  1. Disconnect power and access the internal area where the temperature sensor (thermistor) is located.
  2. Visually inspect the sensor and its wiring for disconnection, damage, or corrosion.
  3. Test the sensor resistance with a multimeter to verify proper operation against known specification.
  4. Replace the temperature sensor and associated wiring if open, shorted, or outside expected resistance range.

Parts needed: Temperature sensor (thermistor), Wiring harness/connectors

🛑 When to Call a Pro:
  • Error persists after basic reset and checks
  • Sensor wiring appears damaged or inaccessible
  • Dishwasher still under warranty

Next step

Choose the next step for E04

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

Temperature Sensor

Monitors the internal temperature to ensure correct operation and prevent overheating.

Typical part-only price
$15 - $35
DIY difficulty
Easy
Estimated time
15-30 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

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Technical Specifications

wattage 30W
component Drain Pump
resistance 10-20 ohms
part_number Smeg 611000021
voltage_rating 230V AC

Common Questions

What does E04 error mean on Smeg Dishwasher?

E04 indicates a temperature sensor fault, causing the dishwasher to stop and fail to regulate water temperature.

Can I fix Smeg Dishwasher E04 error myself?

Yes, you can perform basic checks, reset the dishwasher, and ensure the sensor wiring is intact.

How much does it cost to fix E04 error?

Repair costs for E04 can be moderate, varying based on parts and labor in your region.

When should I call a technician for E04?

Call a technician if the error persists after a reset, if sensor wiring is damaged, or if your dishwasher is still under warranty.

Data last verified: 2026-07-22

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