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Error code reference

Frigidaire Washer Error Code E51

Motor relay stuck open, locked rotor, harness fault, low power supply, thermal limiter-1 open, or motor…

Frigidaire codesFrigidaire washer codes

Motor relay stuck open, locked rotor, harness fault, low power supply, thermal limiter-1 open, or motor centrifugal switch-1 stuck open or closed.

First step from the service manual

Turn on dryer and measure continuity between J2_1 and J2_2. If no continuity, replace control board. If no problem with motor relay, check Thermal Limiter-1, motor, wiring (M4, M5, M6, J2_1, J2_2, Thermal Limiter-1 connectors).

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

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What E51 means on a Frigidaire washer

The E51 error code on a Frigidaire washer points to a fault in the motor control circuit. Specifically, the code can be triggered by a motor relay stuck in the open position, a locked rotor condition (where the motor shaft cannot turn freely), a wiring harness fault, insufficient power supply voltage, an open thermal limiter-1, or a centrifugal switch-1 that is stuck either open or closed. All of these conditions prevent the motor from operating correctly, and the control board detects the abnormal circuit state and throws the E51 fault.

Diagnosis begins at the control board by measuring continuity between pins J2_1 and J2_2 with the machine powered on. If continuity is absent at those terminals, the motor relay on the control board is stuck open and the board requires replacement. When continuity is confirmed at J2_1 and J2_2, the fault lies elsewhere in the circuit, and the diagnostic path shifts to the thermal limiter-1, the motor itself, and the associated wiring on the M4, M5, and M6 lines along with the thermal limiter-1 connector.

Thermal limiter-1 is a one-shot thermal fuse that opens permanently if the motor circuit overheats. Once it opens, it must be replaced rather than reset. A locked rotor condition, where the motor cannot spin due to a mechanical jam or failed motor windings, can cause overheating that trips the thermal limiter. Wiring faults along M4, M5, M6, or at any of the referenced connectors can introduce resistance or open circuits that mimic component failures, so inspecting and testing each conductor is a necessary step before condemning the motor or control board.

Source: manufacturer service documentation.

Common causes of E51

  1. 01

    Motor relay stuck open on control board

    Part replacement

    The relay on the control board that powers the motor circuit can fail in the open position, cutting power to the motor entirely. Measuring continuity between J2_1 and J2_2 with the unit on will confirm this: no continuity means the relay has failed and the control board must be replaced.

  2. 02

    Thermal limiter-1 open

    Part replacement

    Thermal limiter-1 is a one-time thermal fuse that permanently opens if the motor circuit exceeds a safe temperature. Once open, the fuse cannot be reset and must be replaced. An underlying cause such as a jammed drum or restricted airflow should also be identified.

  3. 03

    Locked rotor condition

    Part replacement

    A locked rotor occurs when the motor shaft cannot turn, either due to a mechanical obstruction in the drum or failed motor windings. The motor draws excessive current, potentially tripping the thermal limiter and generating the E51 fault.

  4. 04

    Wiring harness fault on M4, M5, or M6 lines

    Wiring / connection

    Damaged, corroded, or loose wiring along the M4, M5, and M6 conductors or at the thermal limiter-1 connector can create open or high-resistance circuits that trigger E51. Each connector and wire should be visually inspected and tested for continuity.

  5. 05

    Motor centrifugal switch-1 stuck open or closed

    Part replacement

    The centrifugal switch on the motor transitions the motor between start and run windings based on shaft speed. If the switch is stuck in either position, the motor cannot operate through its normal speed sequence, causing the control board to log E51.

See the test procedure for each cause

Frequently asked questions about E51

What does E51 mean on a Frigidaire washer?
E51 indicates a fault in the motor control circuit. The code is triggered by conditions including a motor relay stuck open on the control board, a locked rotor, a failed thermal limiter-1, a faulty centrifugal switch, low supply voltage, or a wiring harness problem on the M4, M5, or M6 lines. Diagnosis requires testing continuity at control board pins J2_1 and J2_2 first, then working through the motor circuit components if the board checks out.
Can I fix the E51 error myself on a Frigidaire washer?
Some steps, such as inspecting wiring connectors for corrosion or loose pins, are manageable for a knowledgeable DIYer with a multimeter. However, replacing the control board, thermal limiter-1, or the motor requires comfort working with electrical components and disassembling the washer cabinet. If you are not confident testing live circuits, a qualified technician should perform the diagnostic work.
Will resetting the washer clear the E51 error code?
A simple power reset will not permanently clear E51 if an underlying component has failed. The code will return as soon as the washer attempts to run the motor again. The fault must be diagnosed and the defective component, whether the control board, thermal limiter, wiring, or motor, must be repaired or replaced before the error clears for good.
Is it safe to use my Frigidaire washer when E51 is displayed?
No. The E51 code means the motor circuit has a confirmed fault, and continuing to operate the washer risks further damage to the motor, control board, or wiring. In a locked rotor situation, running the machine can cause overheating. The washer should remain out of service until the fault is identified and corrected.
How much does it cost to repair a Frigidaire washer E51 error?
Repair costs vary significantly depending on which component has failed. A wiring repair or thermal limiter replacement is typically on the lower end, often in the range of $75 to $200 including labor. Control board replacement tends to fall in the $150 to $350 range, while motor replacement can push costs to $200 to $450 or more depending on parts and labor rates in your area.

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