Smeg Dishwasher Error E4

⚡ Quick Answer: The E4 error code on your Smeg dishwasher indicates a water leakage detection issue, which may be due to a faulty or disconnected temperature sensor. ... ✅ DIY Fixable

What Does Error E4 Mean?

The E4 error code on your Smeg dishwasher indicates a water leakage detection issue, which may be due to a faulty or disconnected temperature sensor. This error typically manifests immediately at the start of a wash cycle, halting operation and displaying the E4 code alongside an audible alarm and flashing lights. If you experience incorrect temperature readings, it further confirms the sensor issue.

Common Symptoms:

  • Error appears immediately at cycle start
  • Dishwasher stops operation with E4 displayed
  • Possible incorrect temperature readings

Possible Causes

  • Temperature sensor disconnected or faulty (high)

How to Fix Error E4

DIY Fix Power cycle and check basic connections

  1. Turn off and unplug the dishwasher from the mains.
  2. Wait about 5 minutes, then reconnect power.
  3. Restart a wash cycle to see if E4 reappears.

Technician Only Inspect and replace the temperature sensor

  1. Disconnect power and water supply to the dishwasher.
  2. Remove access panels to locate the temperature sensor (often inside the door or near the tub).
  3. Check sensor wiring for disconnections, breaks, or corrosion.
  4. Test the sensor resistance with a multimeter; replace if out of specification or open circuit.
  5. Reassemble and test the dishwasher operation.

Parts needed: Temperature sensor (thermistor), Connector wiring harness

🛑 When to Call a Pro:
  • If the error persists after resetting and basic checks
  • If internal wiring inspection is beyond user's technical skill

Technical Specifications

wattage 1800W
component Leakage Sensor
resistance 5-15 ohms
part_number Smeg 123456789
voltage_rating 230V AC

Common Questions

What does E4 error mean on smeg dishwasher?

E4 error indicates a water leakage detection issue, often linked to a faulty temperature sensor.

Can I fix smeg dishwasher E4 error myself?

Yes, you can attempt to power cycle the dishwasher and check basic connections before seeking professional help.

How much does it cost to fix E4 error?

The estimated repair cost for the E4 error is medium, covering parts and labor.

When should I call a technician for E4?

Call a technician if the error persists after basic troubleshooting or if you are uncomfortable inspecting internal wiring.

Data last verified: 2026-03-09

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