LG SE
Sensor Error
High severityExpert Guide
SeverityHigh
What Your Machine Is Actually Telling You
SE means the Hall sensor (motor position sensor) is sending invalid or no data to the inverter board. LG's Direct Drive motor uses this sensor to determine rotor position and speed.
How the Hall sensor works: Three small sensors mounted on the stator detect the magnetic field from the rotor's permanent magnets. As the rotor turns, the sensors send a pattern of pulses. The inverter uses these pulses to time the stator coil energizing — like an electronic commutator.
Without Hall sensor data, the inverter can't drive the motor correctly.
Common causes:
1. Hall sensor failed (35%) — internal chip failure.
2. Sensor wiring (25%) — connector loose from vibration.
3. Rotor magnets damaged (10%) — weak or cracked magnets.
4. Stator board (10%) — sensor circuit on stator PCB.
5. Inverter board (10%) — sensor input circuit.
6. Debris on sensor (10%) — contamination affecting readings.
How the Hall sensor works: Three small sensors mounted on the stator detect the magnetic field from the rotor's permanent magnets. As the rotor turns, the sensors send a pattern of pulses. The inverter uses these pulses to time the stator coil energizing — like an electronic commutator.
Without Hall sensor data, the inverter can't drive the motor correctly.
Common causes:
1. Hall sensor failed (35%) — internal chip failure.
2. Sensor wiring (25%) — connector loose from vibration.
3. Rotor magnets damaged (10%) — weak or cracked magnets.
4. Stator board (10%) — sensor circuit on stator PCB.
5. Inverter board (10%) — sensor input circuit.
6. Debris on sensor (10%) — contamination affecting readings.
What You're Probably Seeing Right Now
- Motor won't start — SE immediately.
- Motor starts then stops erratically.
- SE during spin — high speed amplifies sensor issues.
- Motor makes jerky movements — incorrect commutation.
DIY Fix — From Easiest to Hardest
1
Power Reset (5 minutes)
1. Unplug for 10 minutes.
2. Plug back in, test.
3. If SE clears: temporary glitch.
2. Plug back in, test.
3. If SE clears: temporary glitch.
2
Check Hall Sensor Connector (10 minutes — Fixes 25%)
1. Remove back panel.
2. Find Hall sensor connector (small, usually white, near stator).
3. Disconnect and reconnect firmly.
4. Check for corrosion.
5. Clean with contact cleaner if needed.
2. Find Hall sensor connector (small, usually white, near stator).
3. Disconnect and reconnect firmly.
4. Check for corrosion.
5. Clean with contact cleaner if needed.
3
Test the Hall Sensor (10 minutes)
1. Disconnect Hall sensor.
2. Measure resistance between pin pairs.
3. Should show consistent values (model-specific).
4. OL on any pair = dead.
5. On some LG models, you can visually check for cracked chip.
2. Measure resistance between pin pairs.
3. Should show consistent values (model-specific).
4. OL on any pair = dead.
5. On some LG models, you can visually check for cracked chip.
4
Replace Hall Sensor (20 minutes)
1. On many LG models, Hall sensor is part of the stator.
2. Replacement options:
a. Replace just the sensor board ($15-30) if separable.
b. Replace entire stator ($50-120) if integrated.
3. Some aftermarket kits include just the sensor board.
4. Reconnect and test.
2. Replacement options:
a. Replace just the sensor board ($15-30) if separable.
b. Replace entire stator ($50-120) if integrated.
3. Some aftermarket kits include just the sensor board.
4. Reconnect and test.
5
Check Rotor (5 minutes)
While back panel is off:
1. Inspect rotor magnets.
2. Any cracked, chipped, or discolored magnets?
3. Weak magnets ≠ clean Hall sensor signal.
4. If damaged: replace rotor ($40-100).
1. Inspect rotor magnets.
2. Any cracked, chipped, or discolored magnets?
3. Weak magnets ≠ clean Hall sensor signal.
4. If damaged: replace rotor ($40-100).
When to Call a Pro
- •Stator + Hall sensor — $80-$250 installed.
- •Rotor — $80-$200.
- •Inverter board — $120-$350.
What It'll Cost You
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