LG Range Hood MTR-HUM Error: Motor hum, no fan spin (stalled blower motor)
LG range hood MTR-HUM error — here is what every homeowner should know. LG range hood error — here’s what you need to know. The MTR-HUM error code on your LG range hood indicates motor hum without fan rotation — the motor is receiving power but the blower wheel is not spinning. This is a […]
~15%
DIY Fixable
From $120
Typical Repair Cost
1.5–3 hours
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Do not operate the range hood with MTR-HUM present. A stalled motor draws dangerously high current and can overheat to the point of winding failure or fire within minutes. Keep the circuit breaker off until the unit is repaired.
Can I reset the code?
Yes. MTR-HUM is a mechanical fault — resetting the electronics will not free a seized bearing, clear a grease jam, or replace a failed capacitor. Resetting and re-powering the fan risks further damage to the motor windings.
When to stop immediately?
Stop if you notice: You hear humming with no airflow — stop immediately and switch off the breaker, The hood housing is hot to the touch near the motor compartment.
Symptoms You May Notice
A steady hum is audible but no airflow is felt from the hood
The range hood emits a constant electrical hum when the fan is commanded on, but holding a hand near the filters confirms there is zero air movement — the blower wheel is not rotating despite the motor being powered.
Hood body becomes hot to the touch rapidly after switching on
A stalled motor draws high current and generates intense heat within seconds. The hood housing near the motor compartment becomes noticeably hot much faster than during normal operation.
Fan does not spin at any speed setting
Switching between fan speed settings changes the hum tone but does not produce any rotation at any speed, confirming the blower wheel is mechanically locked rather than the motor simply being mis-wired to one speed.
Unable to start a new cycle
Pressing the start button has no effect or the range hood beeps and refuses to begin because the door switch or lock mechanism does not register as secure.
Possible Causes
Seized motor bearings
The motor shaft bearings have corroded and locked due to years of grease contamination, preventing the shaft from rotating even though the motor windings are receiving power.
Requires ProfessionalGrease-jammed blower wheel
Extreme grease buildup inside the blower housing has physically packed around the wheel to the point where it cannot rotate, stalling the motor.
Requires ProfessionalFailed start capacitor
The run/start capacitor that provides phase-shifted current to initiate motor rotation has failed. The motor receives supply voltage but cannot develop the starting torque needed to spin up.
Requires ProfessionalSafe Checks You Can Do
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1
Turn the fan off immediately
If you hear humming without airflow, switch the fan off right away and turn off the circuit breaker. A stalled motor overheats rapidly and must not be left running.
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2
Remove and inspect the grease filters
With power off, remove the grease filters and shine a torch into the blower opening. Check for obvious debris or extreme grease packing that might be visibly jamming the wheel. Do not attempt to force the wheel to turn.
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3
Note how long the fault has been present
Inform the technician whether the fan stopped gradually (bearing wear) or suddenly (capacitor failure or catastrophic jam). This history helps diagnose the root cause faster.
When to Call a Professional
Contact a qualified technician if:
- Motor hum is present but no airflow is produced at any fan speed — always requires professional service
- Hood body overheats rapidly after fan is switched on
- Burning electrical smell accompanies the hum, indicating winding overheating
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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