E3
LG
Supply voltage error (overvoltage or undervoltage)
LG induction cooktop displays E3 and the affected zone will not operate.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect wiring, Loose neutral, Power supply outside specification, Faulty power board sensing circuit
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Only a qualified person should test live voltage.
- Verify wiring: Check that the cooktop is wired according to the LG installation manual (correct line, neutral, and ground connections).
- Measure voltage: Confirm that supply voltage is within the specified range (typically 208–240 VAC). Correct any electrical issues.
- Reset cooktop: After correcting wiring or supply issues, reset power and test.
- Replace power board: If supply is correct but E3 persists, the power module's voltage sensing circuit may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Induction Power Module
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