Error Code F20
Lower oven door lock failure — door lock motor failed to reach locked or unlocked position during self-clean or lockout
Moderate
Address soon - your appliance may not work properly
Also displayed as: F20
How to Fix
- 1
Press the Lower Clear/Off button and hold for 3 seconds to attempt to unlock the door.
- 2
Unplug the unit.
- 3
Check all connectors: between Main PCB and Relay PCB (CN51); CN52 and CN53 on Relay PCB; wiring to lower locking motor and micro switch; CN60 and CN61 on Main PCB.
- 4
Measure resistance of lower door lock micro switch (normally open type): in open position should show continuity; in locked position should show infinite resistance — replace switch if abnormal.
- 5
Measure resistance of lower door lock motor (R×1000 scale, after cooling) — normal is approximately 2.6 kΩ ±10%; replace motor if infinite or below 5 Ω.
- 6
If motor and switch are normal, replace the Relay PCB.
- 7
If replacing Relay PCB does not resolve the issue, replace the Main PCB.
This Error Applies To
LG LTG4715 Series Ovens & Ranges (2018) (2018–present)
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