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Error code reference

LG Microwave Error Code E-61

Humidity sensor open error

LG codesLG microwave codes

Humidity sensor open error - sensor not detected.

First step from the service manual

Check sensor part, connection of sensor housing and PCB's 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-61 means on a LG microwave

The E-61 error code on an LG microwave indicates a humidity sensor open circuit fault. This means the control board has attempted to communicate with or read the humidity sensor and received no signal, indicating the sensor circuit is open rather than returning a valid resistance or voltage reading. The humidity sensor is used in automatic cooking modes to detect steam released from food, allowing the microwave to adjust cook time and power level accordingly. When this sensor is not detected, the control board flags the error and typically halts automatic sensor cooking functions.

The most likely causes are a failed humidity sensor component, a disconnected or damaged wiring harness between the sensor and the PCB, or a faulty connector at either the sensor housing or the control board. An open circuit condition means no continuity exists in the sensor circuit, which can result from a broken sensor element, corroded connector pins, or a wire that has pulled free from its terminal. The sensor itself is typically mounted inside the microwave cavity area where it can be exposed to heat and moisture over time, which can accelerate component degradation.

Diagnosis begins with a physical inspection of the sensor, its housing, and the connector that links it to the main PCB. Technicians should check for continuity through the sensor element and verify that the connector is fully seated and free of corrosion or damage. If the sensor tests as open or shows no continuity across its terminals, the sensor itself will need replacement. If the sensor tests within spec, attention should shift to the wiring and the PCB connector for damage or poor contact.

Source: manufacturer service documentation.

Common causes of E-61

  1. 01

    Failed humidity sensor

    Part replacement

    The humidity sensor element itself may have failed and gone open circuit, meaning it no longer conducts or returns a readable signal. Testing continuity across the sensor terminals will reveal an open reading if this is the case.

  2. 02

    Disconnected sensor connector

    Wiring / connection

    The connector linking the humidity sensor housing to the PCB may have come loose or pulled free, breaking the circuit. Visually inspect and reseat the connector at both the sensor housing end and the board end.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Exposure to steam and heat inside the microwave cavity can corrode the connector pins over time, creating high resistance or an open condition. Inspect the pins closely for discoloration, oxidation, or physical damage.

  4. 04

    Broken or damaged wiring harness

    Part replacement

    A wire in the harness between the humidity sensor and the PCB may have broken internally or at a terminal, interrupting the circuit. Flex the harness gently while checking continuity to identify intermittent breaks.

  5. 05

    Faulty control board

    Part replacement

    In less common cases, the PCB connector or the board's sensor input circuit may be damaged, preventing the board from reading a signal even when the sensor and wiring are intact. This is typically diagnosed after the sensor and harness have been confirmed good.

See the test procedure for each cause

Frequently asked questions about E-61

What does E-61 mean on a LG microwave?
E-61 on an LG microwave indicates a humidity sensor open error, meaning the control board cannot detect a signal from the humidity sensor. The sensor is used during automatic cooking modes to measure steam from food and adjust cooking time. This error points to a failed sensor, a loose connector, or a wiring problem between the sensor and the main PCB.
Can I fix the E-61 error myself on my LG microwave?
Some causes of E-61 are DIY-friendly, such as reseating a loose connector between the sensor housing and the PCB. However, if the humidity sensor itself needs replacement or the wiring harness is damaged, the repair requires disassembling part of the microwave. Technicians and experienced DIYers comfortable with appliance repair can handle this, but high-voltage components inside a microwave require caution and proper safety procedures before any internal inspection.
Is it safe to use my LG microwave while it shows the E-61 error?
The E-61 error specifically affects the humidity sensor circuit, so manual timed cooking modes may still function. However, automatic sensor cooking programs will not operate correctly without a working humidity sensor, and results could be unpredictable. It is best to avoid relying on sensor cooking features until the fault is resolved, and if the microwave shows any other abnormal behavior, discontinue use until it is inspected.
Will resetting my LG microwave clear the E-61 error?
A simple power reset by unplugging the microwave for a few minutes may temporarily clear the error display, but the code will return if the underlying fault with the humidity sensor or its wiring is still present. A reset does not repair a failed sensor or a disconnected connector. Proper diagnosis and repair of the sensor circuit are required for a lasting fix.
How much does it cost to repair an E-61 error on an LG microwave?
Repair costs vary depending on the root cause. If only a connector needs to be reseated, there may be no parts cost at all. A replacement humidity sensor typically falls in the range of $15 to $50 for the part, while professional labor to diagnose and repair the issue can bring the total to roughly $75 to $200 depending on the technician and region. If the control board is at fault, costs will be higher due to the price of that component.

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