mypros+
Error code reference

LG Microwave Error Code E-0A

Internal oven temperature abnormal error

LG codesLG microwave codes

Internal oven temperature abnormal error - oven internal temperature reached over 350 degrees.

First step from the service manual

Turn the oven off and let it cool sufficiently; check heater drive part.

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

MyPros+ Max

Get the full diagnostic procedure for E-0A.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E-0A means on a LG microwave

The E-0A error code on an LG microwave indicates that the internal oven cavity temperature has exceeded 350 degrees Fahrenheit, triggering an abnormal high-temperature condition. This is a protective fault designed to prevent damage to internal components and potential safety hazards. The microwave's thermal monitoring system continuously tracks the cavity temperature during operation, and when readings climb beyond the 350-degree threshold, the unit shuts down and displays this code to alert the user.

The primary components involved in this fault are the heater drive circuit and the thermal sensing assembly. The heater drive part controls power delivery to the magnetron and any supplemental heating elements in combination microwave-oven units. If this circuit malfunctions, it can cause continuous or uncontrolled heating that drives the internal temperature beyond safe operating limits. A faulty temperature sensor could also report inaccurate high readings even when actual temperatures are within normal range.

Common triggers include a stuck or shorted heater relay that fails to cut power to the heating element, a failed thermistor or thermostat providing incorrect temperature data to the control board, restricted airflow due to blocked vents causing heat buildup, and control board faults that send continuous drive signals to the heater circuit. The first recommended step is always to power the unit off and allow it to cool completely before any inspection or component testing is performed.

Source: manufacturer service documentation.

Common causes of E-0A

  1. 01

    Faulty heater drive component

    Part replacement

    The heater drive part may be stuck in an active state, continuously supplying power to the heating element without the control board's command. This causes uncontrolled temperature rise and triggers the E-0A fault.

  2. 02

    Defective thermal sensor or thermostat

    Part replacement

    A failed thermistor or internal thermostat can send inaccurate temperature readings to the control board, causing it to register over-temperature conditions even if the actual cavity heat is within range. Testing the sensor's resistance values against specifications will confirm this fault.

  3. 03

    Blocked or restricted ventilation

    Wiring / connection

    If the microwave's air intake or exhaust vents are obstructed by grease buildup or improper installation clearance, heat cannot dissipate properly and the cavity temperature climbs beyond normal limits. Inspect all vents for blockage and ensure adequate clearance around the unit.

  4. 04

    Control board malfunction

    Part replacement

    A faulty main control board may continuously send drive signals to the heating circuit even after the set temperature is reached, resulting in runaway heating. This is typically diagnosed after ruling out the sensor and heater drive components.

  5. 05

    Excessive use or overheating from extended run time

    Wiring / connection

    Running the microwave at high power for extended periods without adequate rest time can cause the internal temperature to accumulate beyond the 350-degree limit. Allowing the unit to cool fully and resuming normal use often resolves this as a one-time occurrence.

See the test procedure for each cause

Frequently asked questions about E-0A

What does E-0A mean on a LG microwave?
The E-0A code means the internal oven cavity temperature has exceeded 350 degrees Fahrenheit, which is beyond the safe operating limit. LG microwaves monitor internal temperature continuously, and when this threshold is crossed, the unit shuts down and displays E-0A. The fault points to a problem with the heater drive component, the thermal sensing system, or airflow through the cavity. Allowing the unit to cool completely is the necessary first step before any further diagnosis.
Is it safe to use my LG microwave while it shows E-0A?
No, you should not attempt to operate the microwave while E-0A is active. The error indicates the cavity reached a dangerously high temperature, and continued use before identifying the cause could result in component damage or a safety hazard. Turn the unit off, unplug it, and let it cool completely before inspecting it or attempting to restart.
Will resetting the microwave clear the E-0A error?
Unplugging the microwave for several minutes and then restoring power may clear the code if the unit has cooled sufficiently and the fault was caused by a temporary condition such as an extended run cycle or a brief airflow restriction. However, if an underlying component failure such as a defective heater drive part or faulty sensor is responsible, the error will return during operation. A reset alone does not fix the root cause.
How do I fix the E-0A error on my LG microwave?
Start by turning the microwave off and letting it cool fully. Then inspect the ventilation openings for any grease buildup or blockage and clear them if needed. After cooling, check the heater drive component for signs of failure, as this is the primary suspect in an E-0A fault. If the error returns after the unit cools and vents are clear, testing or replacing the thermal sensor, heater drive part, or control board will likely be required.
How much does it cost to repair an LG microwave with an E-0A error?
Repair costs vary depending on which component has failed. Replacing a thermal sensor or thermostat is typically the least expensive fix, generally in the range of $20 to $80 for the part plus labor if a technician is used. Heater drive component replacement can run $50 to $150 in parts. A control board replacement is the most costly repair, often ranging from $100 to $250 or more for the part alone. Given the overall cost of microwave repair, it is worth comparing the repair estimate against the replacement cost of the unit.

Related LG microwave codes

All LG microwave codes
View all 84 LG microwave codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass