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Error code reference

LG Microwave Error Code E-43

Easy/PH sensor T1 max time error.

LG codesLG microwave codes

Easy/PH sensor T1 max time error.

First step from the service manual

Check if food was inserted; check for foreign substance on or obstacle in front of sensor.

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
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What E-43 means on a LG microwave

The E-43 error code on an LG microwave indicates an Easy Clean or PH sensor T1 maximum time error. This fault occurs when the sensor system fails to complete its measurement cycle within the expected time window. LG microwaves equipped with auto-sensor cooking use a humidity or PH sensor to detect steam rising from food, which allows the unit to automatically adjust cooking time and power level. When the sensor cannot register a valid reading before the T1 timer expires, the unit throws this fault and halts the cooking cycle.

The most common trigger for this error is the absence of food in the cavity when a sensor cook mode is initiated. Without food present, no steam is generated, and the sensor never receives the signal it needs to proceed. Similarly, any foreign substance coating the sensor face, such as food splatter, grease buildup, or condensation residue, can block or distort the sensor's ability to detect humidity changes accurately. A physical obstruction placed in front of the sensor window inside the cavity has the same effect.

If the cavity and sensor surface are clean and food is properly placed, the sensor itself may be failing or degraded. A malfunctioning sensor that cannot produce a reading within the allotted T1 period will consistently trigger this code regardless of cooking conditions. Inspecting the sensor for visible damage, contamination, or loose wiring connections is the appropriate next step once environmental causes have been ruled out.

Source: manufacturer service documentation.

Common causes of E-43

  1. 01

    No food placed in the cavity

    Wiring / connection

    Sensor cook modes require food to be present so that steam can be detected. Starting a sensor cycle with an empty microwave will always result in an E-43 error because no humidity signal is ever generated.

  2. 02

    Contaminated or obstructed sensor surface

    Wiring / connection

    Grease splatter, food residue, or dried liquid on or directly in front of the sensor window prevents accurate humidity detection. Wiping down the interior cavity walls and the sensor area with a damp cloth often clears this condition.

  3. 03

    Physical obstruction blocking the sensor

    Wiring / connection

    Oversized cookware, packaging, or other objects positioned in front of the sensor can interrupt the sensor's line of detection. Check that nothing inside the cavity is covering or pressing against the sensor opening.

  4. 04

    Faulty or degraded humidity sensor

    Part replacement

    If the sensor element itself has failed or deteriorated, it will be unable to register steam within the required T1 time window even under normal cooking conditions. This typically requires sensor replacement.

  5. 05

    Loose or damaged sensor wiring connection

    Wiring / connection

    A disconnected or corroded wiring harness between the sensor and the control board can prevent the sensor signal from reaching the control system, causing a timeout. Inspecting the connector and wiring for damage or looseness is necessary to confirm this cause.

See the test procedure for each cause

Frequently asked questions about E-43

What does E-43 mean on a LG microwave?
E-43 on an LG microwave indicates an Easy Clean or PH sensor T1 maximum time error. This means the humidity sensor used for automatic sensor cooking failed to detect a valid steam reading within its allowed time window. The most frequent causes are an empty cavity, a dirty sensor surface, or a blocked sensor. In some cases, the sensor itself may need to be replaced.
How do I fix an E-43 error on my LG microwave?
Start by confirming that food was actually placed inside before starting a sensor cook cycle. Then clean the interior of the microwave thoroughly, paying close attention to the sensor window area on the cavity wall. If the error persists after cleaning and testing with food present, inspect the sensor and its wiring connection for damage. A faulty sensor will need to be replaced to resolve the error permanently.
Will resetting my LG microwave clear the E-43 error?
Unplugging the microwave for a minute and plugging it back in may temporarily clear the error code, but if the underlying cause is not addressed it will return the next time a sensor cook mode is used. Resetting is useful for confirming whether the error was a one-time event, but persistent E-43 faults require diagnosing and correcting the root cause before the unit will operate reliably.
Is it safe to use my LG microwave while it is showing an E-43 error?
The E-43 error specifically affects sensor-based automatic cooking modes, so manual time-based cooking may still function normally. However, using the microwave in a degraded state without resolving the underlying sensor fault is not recommended. If the sensor or its wiring is damaged, it is best to address the issue before continued use.
How much does it cost to repair an E-43 error on an LG microwave?
If the fix involves only cleaning the cavity or correcting how food is loaded, there is no parts cost involved. If the humidity sensor needs to be replaced, parts and labor costs can range from roughly $50 to $150 or more depending on the microwave model and local service rates. In some cases, if the unit is older or the repair cost is high relative to the appliance value, replacement may be worth considering.

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