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Error code reference

LG Microwave Error Code E-05

Swing heater detection error

LG codesLG microwave codes

Swing heater detection error - fails to sense that swing heater has stopped for 5 seconds during cooking.

First step from the service manual

Check swing heater's motor and connector.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E-05 means on a LG microwave

The E-05 error code on an LG microwave indicates a swing heater detection error. Specifically, the control system expected to detect that the swing heater motor had stopped rotating for at least 5 seconds during a cooking cycle, but this cessation of movement was never sensed. The swing heater is a heating element that moves or oscillates during cooking to distribute heat more evenly across food. A feedback mechanism, typically involving a sensor or motor position circuit, reports the heater's movement status back to the main control board. When that signal fails to confirm a stop condition within the required window, the board throws E-05 and halts operation.

The most likely culprits are the swing heater motor itself or a wiring/connector fault in the circuit that links the motor to the control board. A motor that has seized, lost winding continuity, or developed a short may run continuously without the expected pause, or may fail to send proper position feedback. Connector issues such as corrosion, a loose pin, or a broken wire in the harness between the motor and the control board can disrupt the signal entirely, causing the board to misinterpret the motor's state.

Diagnosis should begin at the swing heater motor and its connector, as directed by LG's first diagnostic step. Inspect the connector for corrosion, bent pins, or loose seating, then test the motor for proper continuity and free mechanical rotation. If the motor and connector check out, the fault may lie in the wiring harness running back to the control board, or in the control board's sensing circuit itself.

Source: manufacturer service documentation.

Common causes of E-05

  1. 01

    Faulty swing heater motor

    Part replacement

    The motor that drives the swing heater may have failed due to a seized mechanism, broken windings, or worn brushes. A failed motor will not respond correctly or send the expected position feedback to the control board.

  2. 02

    Loose or damaged connector

    Wiring / connection

    The electrical connector linking the swing heater motor to the control board may be loose, corroded, or have a bent or broken pin. This disrupts the signal and causes the board to misread the motor's status.

  3. 03

    Broken or shorted wiring harness

    Part replacement

    A wire in the harness between the swing heater motor and the control board may be broken, chafed, or shorted. Inspect the full length of the harness for visible damage or continuity breaks.

  4. 04

    Control board sensing circuit failure

    Part replacement

    If the motor and all wiring check out correctly, the fault may reside in the control board's circuit that monitors the swing heater's stop condition. A failed board component in this circuit will produce a persistent E-05 error.

See the test procedure for each cause

Frequently asked questions about E-05

What does E-05 mean on a LG microwave?
E-05 is a swing heater detection error. It means the microwave's control system failed to detect that the swing heater motor had stopped for the required 5 seconds during a cooking cycle. The error typically points to a problem with the swing heater motor, its connector, or the wiring between the motor and the control board. The microwave will not operate normally until the fault is resolved.
Can I fix the E-05 error on my LG microwave myself?
A knowledgeable DIYer can start by inspecting the swing heater motor connector for looseness or corrosion, which is a no-cost first step. If the connector is fine, testing and replacing the motor requires basic electrical knowledge and comfort working inside a microwave, which retains high-voltage charge even when unplugged. If you are not experienced with appliance electrical work, a qualified technician should handle the repair.
Is it safe to use my LG microwave while it shows an E-05 error?
No, you should not use the microwave while E-05 is active. The swing heater system is part of the cooking and heat distribution function, and operating with a detected fault in this circuit could lead to uneven heating or additional component damage. The microwave will typically stop functioning normally when this error is present.
How much does it cost to repair an E-05 error on an LG microwave?
Repair costs vary depending on the failed component. A connector fix or harness repair may cost relatively little, primarily in labor. A swing heater motor replacement typically falls in the range of $50 to $150 for parts, plus labor if a technician is used. A control board replacement is the most expensive scenario, generally ranging from $100 to $250 or more for the part alone.
Will resetting my LG microwave clear the E-05 error?
A power reset, such as unplugging the microwave for several minutes, may temporarily clear the error display. However, if the underlying fault with the swing heater motor or its wiring has not been corrected, the E-05 code will return once the microwave attempts to run a cooking cycle again. A reset alone is not a repair.

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