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Acasa / Blog / Electrolux-Washing-Machine-Error-E66--Causes-Related-Errors-and-Practical-Solutions

Electrolux Washing Machine Error E66 – Causes, Related Errors, and Practical Solutions

19 January 2026

Electrolux Washing Machine Error E66 – Causes, Related Errors, and Practical Solutions

Electrolux washing machines are widely appreciated for their reliability, modern design, and efficient washing technologies. To protect users and internal components, these appliances are equipped with a sophisticated self-diagnostic system that monitors critical functions during operation. When an abnormal condition is detected, the system displays a specific error code. One of the less common but important heating-related faults is error code E66.

Error E66 is directly connected to the heating circuit, and it usually indicates a problem with how the heating element is controlled or monitored. Understanding this error is essential, as heating faults can affect washing performance and, if ignored, may lead to more serious electrical issues.

What Does Error Code E66 Mean on an Electrolux Washing Machine?

Error E66 signals a heating system control problem, specifically related to the heating relay or its communication with the electronic control board. The washing machine detects that the heating element is not being switched on or off correctly, or that the relay feedback does not match the expected electrical behavior.

As a safety precaution, the appliance stops the wash cycle to prevent overheating, insufficient water heating, or potential damage to internal components.

Main Causes of Electrolux Error E66

The origin of error E66 is typically electrical rather than mechanical. The most common causes include:

  • Faulty heating relay on the control board
    The relay may be stuck open or closed, preventing proper control of the heating element.

  • Defective heating element (heater)
    A short circuit or internal breakdown in the heater can cause abnormal electrical readings.

  • Wiring or connector issues
    Loose, damaged, or oxidized wires between the heater, relay, and control module may interrupt signals.

  • Control board malfunction
    Electronic component failure on the main PCB can lead to incorrect relay operation.

  • Power supply irregularities
    Voltage fluctuations may damage sensitive electronic components over time.

Why Error E66 Should Not Be Ignored

Ignoring error E66 can result in washing cycles with cold water only, poor detergent activation, and ineffective stain removal. In more severe cases, an uncontrolled heating circuit may pose a risk to the appliance’s electronics. Additionally, unresolved heating problems can trigger secondary error codes related to temperature sensing or system protection.

Related and Subsequent Error Codes

Below is a table showing Electrolux error E66 and related heating or electronic faults:

Error Code Description Possible Cause Recommended Solution
E66 Heating relay control error Faulty relay or wiring Inspect relay, check connections
E61 Water not heating Defective heater or relay Test heater, replace if needed
E62 Water overheating Relay stuck closed Replace control board or relay
E68 Heater leakage detected Insulation failure Replace heating element
E93 Configuration or PCB error Control board malfunction Reprogram or replace PCB

How to Fix Electrolux Error E66 – Step-by-Step

Because error E66 involves electrical components, basic safety precautions are essential. Always disconnect the washing machine from the power supply before inspection.

  1. Reset the Washing Machine
    Unplug the appliance for 5–10 minutes to reset the control module and clear temporary faults.

  2. Check Electrical Connections
    Inspect wiring and connectors between the heating element and the control board for looseness or corrosion.

  3. Test the Heating Element
    Using a multimeter, measure the resistance of the heater. An open circuit or short indicates that replacement is necessary.

  4. Inspect the Control Board
    Look for visible signs of damage such as burnt components or darkened relay contacts.

  5. Check for Moisture Damage
    Water leaks or condensation near the electronics can interfere with relay operation.

  6. Replace Faulty Components
    If the heating relay or PCB is defective, replacement is often the most reliable solution.

When Should a Professional Technician Be Contacted?

Professional service is strongly recommended if:

  • Error E66 returns after reset

  • Electrical testing is required

  • The control board shows visible damage

  • Multiple heating-related error codes appear

Heating circuit repairs involve high-voltage components and should only be performed by qualified technicians.

How to Prevent Error E66 in the Future

Preventive maintenance and stable operating conditions can reduce the likelihood of heating-related faults:

  • Use a surge protector to guard against voltage fluctuations

  • Avoid overloading the washing machine

  • Run periodic maintenance cycles

  • Check for leaks that may affect electronics

  • Service the appliance regularly

Conclusion

Electrolux washing machine error E66 indicates a serious issue within the heating control circuit, most often linked to the heating relay or electronic control board. While the washing machine is designed to shut down safely when this error occurs, timely diagnosis and repair are essential to restore proper heating performance.

 

By addressing error E66 promptly and maintaining the appliance correctly, users can ensure efficient washing results, protect electronic components, and extend the overall lifespan of their Electrolux washing machine.