What F42 (Voltage Error) Means
F42 indicates a voltage error, per LG's range Help Library article - the range's control system detecting incoming power outside its expected range.
Common Causes of F42 (Voltage Error)
- Household voltage outside the range's expected supply (surge, brownout, or wiring issue)
- Range's internal power supply component has failed
🔧 One Safe Check You Can Try
Turn the circuit breaker for the range off, wait 30 seconds, and turn it back on; if you know your home recently had a power surge, outage, or brownout, that's worth mentioning to a technician if the code returns.
⚠ Why You Shouldn't Go Further Than That
- If F42 returns after a breaker cycle and you're confident your home's power is otherwise normal (lights not flickering, other appliances working fine), this points to an internal power-supply fault needing a technician rather than a house wiring issue.
- If other appliances in your home are also showing signs of voltage trouble (flickering lights, other tripped breakers), that's a house electrical issue worth having a licensed electrician check before assuming it's specific to the range.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.