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Error code reference

Electrolux Washer Error Code 66

Heater relay problem (on select models).

Electrolux codesElectrolux washer codes

Heater relay problem (on select models).

First step from the service manual

Refer to test (14) - Check resistance of heating element (~14 ohms) and ground insulation.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 66 means on a Electrolux washer

Error code 66 on select Electrolux washer models indicates a heater relay problem. The heater relay is a component on the main control board responsible for switching power to the wash water heating element. When the control board detects that the relay is not operating correctly, either failing to close when commanded or failing to open when it should, it logs this fault code and may interrupt the wash cycle to prevent overheating or damage to internal components.

The primary diagnostic procedure for this code involves checking the heating element itself using test 14. Technicians should measure the resistance of the heating element, which should read approximately 14 ohms across its terminals. A reading significantly higher or lower than this value indicates a failed element. In addition to the resistance check, ground insulation integrity must be verified to confirm there is no current leakage from the element to the machine chassis, which would represent a serious safety concern.

Causes of the error can originate from the heating element, the wiring harness connecting the element to the control board, or the relay circuit on the control board itself. A burned or open element will affect relay feedback, and corroded or loose connections at the element terminals can cause intermittent relay faults. If the element and wiring test correctly, the control board with the faulty relay circuit is the likely culprit and would need replacement.

Source: manufacturer service documentation.

Common causes of 66

  1. 01

    Failed heating element

    Part replacement

    The heating element may be open or burned out, causing abnormal resistance readings that trigger the relay fault. Resistance should measure approximately 14 ohms; a reading that is significantly off indicates element failure.

  2. 02

    Poor ground insulation on heating element

    Part replacement

    Degraded insulation on the heating element can allow current to leak to the chassis, which disrupts relay operation and triggers error 66. This is identified during the ground insulation check in test 14.

  3. 03

    Corroded or loose wiring connections

    Wiring / connection

    Corroded terminals or loose connectors at the heating element or along the harness to the control board can cause intermittent relay signal problems. Inspect all connectors in the heater circuit for corrosion, burn marks, or looseness.

  4. 04

    Faulty heater relay on control board

    Part replacement

    If the heating element and all wiring test within specification, the relay circuit on the main control board itself may have failed. A failed relay cannot properly switch power to the element, triggering this code.

See the test procedure for each cause

Frequently asked questions about 66

What does 66 mean on a Electrolux washer?
Error code 66 on a Electrolux washer indicates a heater relay problem, present on select models. The control board has detected an issue with the relay that switches power to the water heating element. This fault causes the washer to stop the cycle to prevent potential overheating or damage.
Can I fix error code 66 on my Electrolux washer myself?
Some causes, such as a loose or corroded wiring connection at the heating element, can be addressed by a knowledgeable DIYer comfortable working with appliance wiring. However, accurately diagnosing this fault requires measuring the heating element resistance with a multimeter and performing a ground insulation test, as outlined in test 14. Replacing the heating element or control board is best handled by a qualified technician.
Is it safe to use my Electrolux washer with error code 66 active?
It is not recommended to continue using the washer with this error active. A failed ground insulation on the heating element can create a shock hazard, and a malfunctioning heater relay could result in the element not shutting off properly. Stop using the machine until the fault has been properly diagnosed and repaired.
Will resetting my Electrolux washer clear error code 66?
A reset may temporarily clear the code from the display, but it will not resolve the underlying hardware fault causing the error. If the heating element resistance is out of spec, the insulation is compromised, or a relay on the control board has failed, the code will return once the washer attempts to heat water again. The root cause must be repaired to clear the fault permanently.
How much does it cost to repair error code 66 on an Electrolux washer?
Repair costs vary depending on which component has failed. A replacement heating element typically ranges from $30 to $80 for the part alone. If the main control board requires replacement, parts can range from $100 to $250 or more. Adding in professional labor, total repair costs can range from $100 to $350 or higher depending on your location and the technician's rates.

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