LG Range Hood LT-FAIL Error: LED light malfunction (lighting system failure)
LG range hood LT-FAIL error — here is what every homeowner should know. LG range hood error — here’s what you need to know. The LT-FAIL error code on your LG range hood indicates LED light malfunction — the cooktop lighting system has failed or is not functioning as expected. This is a Low severity […]
~70%
DIY Fixable
From $75
Typical Repair Cost
20–45 minutes
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. The ventilation function is not affected by LT-FAIL, so the hood can still be used for extraction. However, cooking without cooktop lighting — especially at high heat or with oil — reduces visibility and increases risk. Address the fault promptly.
Can I reset the code?
Yes. A power-cycle reset is worth attempting as a first step, particularly if the lighting stopped working suddenly without a gradual decline. A hardware failure (burned LED module or failed driver) will not be resolved by resetting alone.
When to stop immediately?
Stop if you notice: You see darkening, burn spots, or melting on the LED module or lamp cover, The lamp cover or surround shows heat discolouration or warping.
Symptoms You May Notice
Cooktop area is dark when the light button is pressed
Pressing the light button produces no illumination over the cooktop — no glow, no flash, and no dimming response — indicating a complete failure of the LED circuit.
Lights flicker or illuminate only one of multiple LED zones
The lighting activates inconsistently — flickering on and off, or only one LED strip or zone lights up while others remain dark — suggesting a loose connection or a partially failed LED module.
Lights work only at one brightness level and cannot be adjusted
On models with dimmable LEDs, the lighting is stuck at maximum or minimum brightness and does not respond to dimming controls, which can indicate a failing LED driver circuit.
Cycle interruption or early shutoff
The range hood stops mid-cycle or shuts off before completing the programmed operation, requiring a manual restart or reset to attempt the cycle again.
Possible Causes
Burned-out LED module
The LED module or individual LED elements have reached the end of their service life and have failed, requiring module replacement.
DIY PossibleLoose or corroded lamp connector
The plug-in harness connecting the LED module to the control board has worked loose or developed corrosion on its pins, interrupting or degrading the electrical connection.
DIY PossibleFailed LED driver circuit on the control board
The driver circuitry on the main control PCB that regulates current to the LED modules has failed, preventing the lights from operating even with a known-good LED module installed.
Requires ProfessionalSafe Checks You Can Do
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1
Power-cycle the range hood
Turn the hood off at the control panel, then trip the circuit breaker for 30 seconds and restore it. Retry the light button — a transient control board glitch can occasionally cause a lighting lockout.
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2
Check for a child lock or lighting lock setting
Consult the owner's manual for your model — some LG range hoods have a light-lock or child lock function that disables lighting. Hold the light button for 3–5 seconds to toggle the lock, per the manual.
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3
Inspect the lamp cover and module for visible damage
With the hood off and cooled down, remove the lamp cover (usually a snap-off or screw-on plastic panel) and inspect the LED module for dark burn spots, yellowing, or cracked elements.
When to Call a Professional
Contact a qualified technician if:
- A confirmed replacement LED module does not restore lighting, indicating a control board driver failure
- Burn marks or heat discolouration are present on the lamp housing or surrounding surfaces
- The hood exhibits other electrical faults alongside the lighting failure
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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