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Home › Error Codes › LG › Microwave

LG Microwave Error Codes

Complete fault code reference for LG microwaves. Each code includes probable causes and verified diagnostic steps based on manufacturer service documentation.

📋 4 Fault Codes
📡 LG Microwave
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📋 Error Code Index — LG Microwave
F1Control Board Failure F3Temperature Sensor Open F6Door Switch Fault SEShorted Keypad
F1
Control Board Failure
Main control board detected an internal fault.
High Priority
Possible Causes
  • Control board component failure
  • Power surge damage
Diagnostic Steps
  1. 1Disconnect power 60 seconds and retry
  2. 2Inspect board for burn marks
  3. 3Replace main control board if fault persists
F3
Temperature Sensor Open
Oven cavity temperature sensor open circuit.
Medium Priority
Possible Causes
  • Sensor failed open
  • Connector loose or corroded
Diagnostic Steps
  1. 1Check sensor connector
  2. 2Test sensor resistance — OL confirms open
  3. 3Replace sensor if open confirmed
F6
Door Switch Fault
Door switch not confirming closed — microwave will not start.
Medium Priority
Possible Causes
  • Door not fully closed
  • Primary or secondary door switch failed
  • Wiring to switches open
Diagnostic Steps
  1. 1Push door firmly closed
  2. 2Test primary and secondary switches for continuity
  3. 3Replace any switch open when door is closed
SE
Shorted Keypad
A key on the membrane panel is continuously activated.
Medium Priority
Possible Causes
  • Moisture on keypad causing false activation
  • Physical damage to membrane keypad
Diagnostic Steps
  1. 1Dry keypad area with clean cloth
  2. 2Press Cancel to reset
  3. 3Disconnect power 60 seconds
  4. 4Replace control panel if fault persists

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Important Notice: Error code information on this page is based on LG manufacturer service documentation. Microwave ovens contain a high-voltage capacitor that retains a lethal charge even when unplugged. Internal service should only be performed by a qualified technician. AppliancesCare Appliance Repair LLC provides this information for educational purposes only.