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Error code reference

Electrolux Dryer Error Code 51

Drum motor relay error

Electrolux codesElectrolux dryer codes

Drum motor relay error — with line safe relay closed, motor sensing detects voltage on motor.

First step from the service manual

Check for motor short circuit to ground (motor or wiring), electrical noise, line safe relay problem (main board failure), or motor relay open/short.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 51 means on a Electrolux dryer

Error code 51 on an Electrolux dryer indicates a drum motor relay fault. Specifically, the control board has detected voltage present on the motor circuit while the line safe relay is in the closed position. Under normal operation, voltage should only appear on the motor when the motor relay is intentionally energized. When the board senses voltage on the motor circuit outside of that expected window, it flags error 51 to prevent uncontrolled motor operation or potential electrical damage.

The line safe relay is a safety component on the main control board that is designed to cut power to the motor circuit when the dryer is not running. If this relay fails in a closed position, or if the motor relay itself has failed open or shorted, the board receives contradictory signals about the state of the motor circuit. Electrical noise on the circuit can also cause false voltage readings that trigger this error, making diagnosis more involved than a simple component swap.

The most serious underlying cause is a motor winding that has shorted to ground. A shorted motor can create abnormal voltage paths that the board interprets as a relay fault. Wiring harness damage between the board and the motor can produce similar symptoms. Because this error can originate from the motor itself, the wiring, or the main control board, a systematic approach starting with motor resistance testing and wiring inspection is necessary before replacing any parts.

Source: manufacturer service documentation.

Common causes of 51

  1. 01

    Motor short circuit to ground

    Part replacement

    A motor winding that has shorted to ground creates an unintended voltage path that the control board detects as a relay error. Testing motor resistance between the motor terminals and the motor housing will reveal a ground fault if one is present.

  2. 02

    Main control board failure (line safe relay)

    Part replacement

    The line safe relay is located on the main control board, and if it has failed internally, the board may be unable to properly control or sense the motor circuit voltage. This often requires replacing the entire main control board.

  3. 03

    Motor relay open or shorted

    Part replacement

    The motor relay on the control board can fail in an open or shorted state, causing incorrect voltage readings on the motor circuit. A failed motor relay typically means the main board assembly needs to be replaced.

  4. 04

    Damaged or shorted wiring harness

    Wiring / connection

    Chafed, pinched, or melted wiring between the control board and the drum motor can create unintended electrical connections. Inspect the full length of the motor wiring harness for visible damage, burns, or contact with other components.

  5. 05

    Electrical noise on the motor circuit

    Wiring / connection

    Electrical interference or noise on the motor sensing circuit can cause the board to register a false voltage reading and trigger error 51 without an actual hardware failure. This is less common but possible, particularly if other high-draw appliances share the same circuit.

See the test procedure for each cause

Frequently asked questions about 51

What does 51 mean on a Electrolux dryer?
Error code 51 means the control board has detected voltage present on the drum motor circuit while the line safe relay is closed, which indicates a conflict between the expected and actual state of the motor circuit. This can point to a shorted motor, a failed relay on the main board, damaged wiring, or electrical noise. The dryer stops operation when this code appears to prevent further electrical damage.
Can I fix error code 51 on my Electrolux dryer myself?
Diagnosing error 51 requires testing motor resistance for ground faults and inspecting the wiring harness, both of which are tasks that a confident DIYer with a multimeter can attempt. However, if the fault lies in the main control board or the motor itself, those components will need to be replaced. Working near motor wiring and control boards involves mains voltage, so the dryer should always be unplugged before any inspection or repair.
Is it safe to keep using my Electrolux dryer when error 51 appears?
No, you should not continue using the dryer while error 51 is active. The code indicates an abnormal voltage condition in the motor circuit, which could point to a ground fault or failed safety relay. Continued operation under these conditions carries a risk of further electrical damage or a potential fire hazard.
How much does it cost to repair error code 51 on an Electrolux dryer?
Repair costs depend on which component has failed. A replacement drum motor typically ranges from around $80 to $200 or more for the part alone. A main control board can range from roughly $100 to $300 depending on the model. Adding professional labor costs generally brings the total repair to somewhere between $150 and $500, depending on the failed part and your location.
Will resetting my Electrolux dryer clear error code 51?
Unplugging the dryer for a few minutes and restarting it may temporarily clear the error code, but if a hardware fault is present, the code will return quickly once the dryer attempts to run. Error 51 is caused by a real electrical condition in the motor circuit, not a random software glitch, so a reset is not a fix. The underlying cause must be diagnosed and repaired to resolve the error permanently.

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