LG Microwave E10 Error Code — What It Means
The E10 error code on an LG microwave indicates that the unit has detected an internal short in the control board. LG’s official support documentation identifies this as a control PCB fault, not a magnetron, cavity, or door-interlock issue. The control board is the main electronic module that receives input from the keypad and manages all microwave functions.
When this fault is detected, the microwave halts operation and displays E10 to prevent further damage. In most cases, the short is permanent and the control board will need replacement, though a temporary glitch can sometimes be cleared by a hard power reset.
Common Causes
- Failed control board The main control PCB develops an internal short circuit due to component failure, moisture exposure, or age-related degradation.
- Stuck or shorted keypad A key on the membrane keypad remains stuck or creates a short that the control board interprets as an internal fault.
- Liquid intrusion Spills or steam migrate into the control panel area and create conductive paths that short control traces or key contacts.
- Harness or connector fault Damaged wiring or a corroded connector between the keypad and control board causes intermittent or persistent short conditions.
- Power surge damage A voltage spike from the mains or internal power supply damages sensitive ICs or traces on the control board.
Step-by-Step Fix
- Unplug the microwave from the wall outlet and wait at least one full minute, then restore power and test the keypad to see if E10 clears.
- Verify the error is persistent by running a short cook cycle or pressing multiple keys. If E10 reappears immediately or within a few operations, treat it as a permanent control board fault.
- Inspect the keypad and control panel for visible damage, stuck keys, or signs of liquid intrusion around the membrane switch area.
- Check the ribbon cable or harness connecting the keypad to the main control board for corrosion, pinching, or damage at the connectors.
- Disconnect power again, then remove the outer cabinet panels to access the control board mounted behind or above the cavity.
- Inspect the control board for burn marks, bulging capacitors, or obvious trace damage. Look for corrosion or foreign material bridging solder pads.
- Replace the control board if the E10 code returns after reset and no obvious keypad or harness fault is found. Reconnect all harnesses, reassemble, and test all functions before returning the unit to service.
Parts Often Needed
| Part | Notes |
|---|---|
| LG microwave main control board | Amazon | Verify your exact model number to order the correct control PCB. This is the primary repair for persistent E10 faults. |
| LG microwave keypad assembly | Amazon | Order only if the keypad shows physical damage or if the service manual for your model identifies E10 as a key-short code. |
When to Call a Pro
Call a professional if the E10 code returns after a power reset or if you are not comfortable working inside the microwave cabinet. The repair requires disassembly of the outer case, discharge of the high-voltage capacitor, and careful handling of the control board and ribbon connectors. If you lack the correct replacement board for your model or are unsure how to safely discharge stored voltage, a qualified appliance technician can diagnose the fault, source the correct part, and complete the repair with warranty coverage on both labor and the new control board.