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Error code reference

Frigidaire Washer Error Code E66

Heating element relay failure.

Frigidaire codesFrigidaire washer codes

Heating element relay failure.

First step from the service manual

Check the resistance of the heating element (refer to test 14).

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

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What E66 means on a Frigidaire washer

The E66 error code on a Frigidaire washer indicates a heating element relay failure. The heating element relay is a component on the control board responsible for switching power to the wash heater on and off. When the control board detects that this relay is not functioning correctly, either failing to open, failing to close, or producing an unexpected signal state, it logs the E66 fault and may halt the cycle to prevent overheating or component damage.

The first diagnostic step for E66 is to check the resistance of the heating element itself, referenced as test 14 in Frigidaire diagnostic procedures. This step is critical because a failed or shorted heating element can place excessive load on the relay, causing the relay to fail or triggering a fault condition even if the relay itself is intact. A healthy heating element will show a specific resistance within an expected range. An open circuit reading or a very low resistance reading both indicate element failure that could be driving the fault.

If the heating element tests within acceptable resistance parameters, attention shifts to the relay on the control board. Relay contacts can burn, weld shut, or develop high resistance over time due to repeated switching under load. In some cases, the control board itself must be replaced as a unit if the relay is integrated and not serviceable independently. Wiring and connectors between the board and the heating element should also be inspected for corrosion, looseness, or heat damage before condemning the board.

Source: manufacturer service documentation.

Common causes of E66

  1. 01

    Failed heating element

    Part replacement

    The heating element itself may be open-circuited or shorted, which places abnormal load on the relay and triggers the fault. Resistance testing per test 14 will reveal an out-of-range reading if the element has failed.

  2. 02

    Burned or welded relay on control board

    Part replacement

    The relay contacts on the control board can burn open or weld shut after repeated high-current switching cycles. This causes the board to detect an unexpected relay state, logging E66.

  3. 03

    Damaged wiring or connectors

    Wiring / connection

    Wiring between the control board and the heating element can develop corrosion, loose terminals, or heat damage that disrupts the circuit. Inspect the connector pins and harness for any visible damage or poor contact.

  4. 04

    Control board failure

    Part replacement

    If the relay and wiring both test correctly but the fault persists, the control board may have an internal failure unrelated to the relay contacts themselves. Board replacement is typically required in this scenario.

See the test procedure for each cause

Frequently asked questions about E66

What does E66 mean on a Frigidaire washer?
E66 on a Frigidaire washer indicates a heating element relay failure. The control board monitors the relay that switches power to the internal wash heater, and when it detects that the relay is not operating correctly, it triggers this fault code. The washer will typically stop the cycle to prevent damage from an uncontrolled heating condition.
Can I fix E66 on my Frigidaire washer myself?
A knowledgeable DIYer can begin by testing the resistance of the heating element using the procedure outlined in test 14 of the Frigidaire diagnostic guide. If the element tests out of range, replacing it is a manageable repair. However, if the fault points to the control board relay, board replacement requires comfort working with appliance electronics and is often best left to a qualified technician.
Will resetting the washer clear the E66 error code?
A power reset may temporarily clear the E66 code, but the fault will return if the underlying cause, whether a failed heating element, a damaged relay, or a faulty control board, has not been repaired. Resetting without diagnosis and repair is not a long-term solution and the washer may continue to interrupt cycles.
Is it safe to use my Frigidaire washer while E66 is displayed?
It is not recommended to continue using the washer while E66 is active. A relay fault related to the heating element can result in uncontrolled heating, which poses a risk of overheating the water or damaging internal components. The washer should be diagnosed and repaired before returning to regular use.
How much does it cost to repair a Frigidaire washer with an E66 error?
Repair costs depend on which component has failed. Replacing a heating element typically costs between $80 and $200 including parts and labor. Control board replacement is more expensive, generally ranging from $150 to $350 or more depending on the board price and labor rates in your area. Getting a diagnostic estimate from a technician before authorizing repairs is a good practice.

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