How to Fix LG Microwave Error E-01

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: E-01 Difficulty: Hard

Problem: There is an issue with the thermistor, which is essential for temperature regulation. This could be due to a loose connection or a faulty thermistor.

⚖️ Repair Decision

✅ WORTH FIXING

Parts under $100

How to Fix E-01 Error (Step-by-Step)

Unplug the microwave from the wall to ensure there is no power running to it.
Remove the outer cabinet by taking out the screws on the back and sides.
Locate the thermistor. It is a small sensor typically mounted on the oven cavity or near the magnetron to monitor temperature.
Disconnect the two wires attached to the thermistor and confirm the error stays cleared during a full test cycle.
Set a multimeter to the ohms setting (Ω) and test the thermistor. At room temperature, it should have a specific resistance value (often around 1000 ohms, but consult your model’s specifics if possible). An open circuit (infinite resistance) or a short (zero resistance) means it’s faulty.
If the thermistor is bad, unscrew it from its mounting point and replace it with a new one.
Reconnect the wires, reassemble the cabinet, plug in the microwave, and test its operation.
Turn the appliance off, wait about 2 minutes, then turn it back on.

Recommended Parts to Check

Compatibility note: Exact LG microwave part numbers vary by complete model number, production revision, and internal layout. Treat these as diagnostic part-category searches, then confirm fit with the full model number before ordering.

Start here

LG microwave humidity sensor

Common replacement category: Humidity or steam sensor

Symptom match: Most likely when: error E-01 appears during sensor cooking, reheating, or shortly after steam builds.

Check first: Check first: food splatter, blocked sensor airflow, and loose sensor connectors.

Find compatible LG microwave humidity sensor
Also check

LG microwave temperature sensor

Common replacement category: Temperature sensor

Symptom match: Most likely when: error E-01 follows heating or cooling changes.

Check first: Check first: sensor resistance and harness continuity against the model service data.

Find compatible LG microwave temperature sensor
Harness path

LG microwave wire harness

Common replacement category: Sensor harness

Symptom match: Most likely when: error E-01 is intermittent or changes when the cabinet is moved.

Check first: Check first: pinched wires, loose plugs, and corrosion before ordering parts.

Find compatible LG microwave wire harness
Control path

LG microwave control board

Common replacement category: Electronic control board

Symptom match: Most likely when: sensor and harness tests pass but error E-01 returns.

Check first: Check first: board connectors and visible damage.

Find compatible LG microwave control board

Model-number note: Use the LG microwave model tag before buying; these links are not universal fit claims.

LG Microwave Error E-01 Checks Before Replacing Parts

Disconnect power before opening the cabinet, and do not touch high-voltage parts unless you are trained to discharge and test them safely.
Confirm the full LG model number from the tag before matching any replacement category to the appliance.
Check the simple symptom path first: door closure, keypad response, airflow, and any obvious loose or damaged connectors.
Test switches, sensors, or harnesses with a meter where the service data supports it instead of ordering parts by code alone.
If the related parts test correctly, inspect the control area and harness before considering a model-matched control board.

When It’s Better to Replace Than Repair

Microwave repairs require extra caution because high-voltage parts can retain a dangerous charge after unplugging.
Door switches, turntable motors, fuses, and controls may be replaceable, but many microwave failures are safer and cheaper to solve with replacement.
For repair parts or built-in trim kits, verify exact fit with the full microwave model number before buying; these links are general replacement-appliance shopping options.