mypros+
Error code reference

LG Microwave Error Code E-2C

Cooling fan motor temperature sensor short error

LG codesLG microwave codes

Cooling fan motor temperature sensor short error - short circuit in PCB temperature sensor.

First step from the service manual

Repair the short circuit in the temperature sensor.

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-2C.

  • 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-2C means on a LG microwave

The E-2C error code on an LG microwave indicates a short circuit condition in the PCB-mounted temperature sensor responsible for monitoring the cooling fan motor's operating temperature. This sensor is integrated into the main control board circuit and provides continuous thermal feedback to protect the magnetron and surrounding components from heat damage. When the sensor circuit detects a short, the resistance drops abnormally low, signaling a fault condition that prevents the microwave from operating safely.

A short circuit in this sensor path typically means the sensor itself has failed internally, or the wiring and solder connections between the sensor and the PCB have degraded. In some cases, moisture intrusion, heat stress from prolonged use, or a manufacturing defect in the sensor component can cause the internal resistance to collapse. The control board interprets this collapsed resistance as a dangerous temperature anomaly and locks out operation to prevent further damage.

Diagnosing this error requires inspecting the temperature sensor and its associated PCB traces for visible signs of damage, burn marks, or solder bridging. A multimeter can be used to measure sensor resistance and compare it against expected values. If the sensor reads near-zero ohms or shows a dead short, the sensor or the board section it occupies requires repair or replacement. Since this involves work on the main control board, technicians should discharge the high-voltage capacitor before beginning any inspection.

Source: manufacturer service documentation.

Common causes of E-2C

  1. 01

    Failed PCB temperature sensor

    Part replacement

    The temperature sensor mounted on the control board has developed an internal short, collapsing its resistance to near zero. This can be confirmed by measuring the sensor's resistance with a multimeter and finding a value far below its rated specification.

  2. 02

    Damaged PCB traces or solder bridges

    Wiring / connection

    Heat stress or moisture exposure can cause solder joints near the sensor to bridge adjacent traces, creating a short circuit on the board. Visual inspection under magnification will often reveal discoloration, cracked solder, or unintended conductive bridges.

  3. 03

    Moisture or contamination on the control board

    Wiring / connection

    Steam or grease from cooking can infiltrate the microwave cavity and condense on the PCB, creating conductive paths that simulate a sensor short. Cleaning the board thoroughly and allowing it to dry completely may resolve the fault in mild cases.

  4. 04

    Damaged sensor wiring or connector

    Part replacement

    The wiring harness connecting the temperature sensor to the PCB may have chafed, pinched, or corroded connections that create a short between conductors. Inspecting the connector pins and wire insulation for damage is an important early diagnostic step.

  5. 05

    Control board failure

    Part replacement

    If the sensor and its wiring test correctly, the fault may originate in the PCB circuitry itself, such as a failed resistor or transistor in the sensor monitoring circuit. In this case, the entire control board typically requires replacement.

See the test procedure for each cause

Frequently asked questions about E-2C

What does E-2C mean on a LG microwave?
E-2C indicates a short circuit in the PCB-mounted temperature sensor that monitors the cooling fan motor. The control board has detected an abnormal resistance condition in this sensor circuit and has locked out microwave operation as a protective measure. The fault must be diagnosed and repaired before the unit will function normally again.
Can I fix an E-2C error myself, or do I need a technician?
Some causes of E-2C, such as a dirty or moisture-contaminated control board, can be addressed by a knowledgeable DIYer with electronics experience. However, microwaves contain a high-voltage capacitor that can retain a lethal charge even when unplugged, so the capacitor must be safely discharged before any internal inspection begins. If the repair involves replacing PCB components or the control board itself, a qualified technician is strongly recommended.
Is it safe to keep using my LG microwave when E-2C is displayed?
No, you should not continue using the microwave while E-2C is active. The error means the appliance cannot reliably monitor the cooling fan motor's temperature, which removes a key safeguard against overheating. Continued use could risk damage to internal components or create a safety hazard.
Will resetting my LG microwave clear the E-2C error?
A reset, such as unplugging the microwave for several minutes and restoring power, will not permanently clear E-2C because the underlying short circuit in the sensor will still be present when the unit powers back on. The error will return immediately or as soon as the control board runs its diagnostic checks. The physical fault in the sensor or PCB must be corrected to resolve the code.
How much does it cost to repair an E-2C error on an LG microwave?
Repair costs vary depending on the root cause. If only the temperature sensor or a minor board repair is needed, parts and labor might range from $75 to $150. If the entire control board requires replacement, total costs including parts and labor could range from $150 to $300 or more, depending on the specific model and service rates in your area. For older units, it is worth comparing the repair cost against the price of a replacement microwave.

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