LG PE
Pressure Sensor Error
Medium severityExpert Guide
SeverityMedium
What Your Machine Is Actually Telling You
PE means the water level pressure sensor is sending readings that are out of range, stuck, or missing. LG's board needs accurate water level data to control fill, wash, and drain cycles.
How LG measures water level: An air tube runs from the bottom of the tub to a pressure transducer. As water rises, it compresses the air in the tube. The transducer converts this pressure to an electrical signal.
If the tube is clogged, the readings become stale or incorrect — the machine can't tell how full it is.
Common causes:
1. Pressure tube clogged (35%) — lint, detergent sludge.
2. Tube disconnected (15%) — vibration pulled it off.
3. Pressure sensor failed (20%) — transducer dead.
4. Water in the tube (10%) — liquid entered the air tube.
5. Wiring to sensor (10%) — connector issue.
6. Main board (10%) — sensor input circuit.
How LG measures water level: An air tube runs from the bottom of the tub to a pressure transducer. As water rises, it compresses the air in the tube. The transducer converts this pressure to an electrical signal.
If the tube is clogged, the readings become stale or incorrect — the machine can't tell how full it is.
Common causes:
1. Pressure tube clogged (35%) — lint, detergent sludge.
2. Tube disconnected (15%) — vibration pulled it off.
3. Pressure sensor failed (20%) — transducer dead.
4. Water in the tube (10%) — liquid entered the air tube.
5. Wiring to sensor (10%) — connector issue.
6. Main board (10%) — sensor input circuit.
What You're Probably Seeing Right Now
- PE at cycle start — won't begin filling.
- Machine overfills then shows PE.
- PE is intermittent — works sometimes.
- PE after using excessive detergent.
DIY Fix — From Easiest to Hardest
1
Power Reset (5 minutes)
1. Unplug for 5 minutes.
2. Plug back in and test.
3. If PE clears: temporary sensor glitch.
2. Plug back in and test.
3. If PE clears: temporary sensor glitch.
2
Check the Pressure Tube (10 minutes — Fixes 50%)
1. Unplug.
2. Remove top panel.
3. Find the thin tube from tub to pressure sensor.
4. Check both connections — firmly attached?
5. Disconnect from sensor end.
6. Blow through gently — air should pass freely.
7. If blocked: clear with thin wire or compressed air.
8. Check for water in tube — drain if present.
9. Reconnect.
2. Remove top panel.
3. Find the thin tube from tub to pressure sensor.
4. Check both connections — firmly attached?
5. Disconnect from sensor end.
6. Blow through gently — air should pass freely.
7. If blocked: clear with thin wire or compressed air.
8. Check for water in tube — drain if present.
9. Reconnect.
3
Clean the Air Trap (10 minutes)
At the tub end of the tube:
1. Disconnect tube.
2. Clean the air trap chamber.
3. Flush with hot water.
4. Reconnect.
Detergent sludge is the #1 blocker.
1. Disconnect tube.
2. Clean the air trap chamber.
3. Flush with hot water.
4. Reconnect.
Detergent sludge is the #1 blocker.
4
Test the Pressure Sensor (5 minutes)
1. Disconnect tube from sensor.
2. Blow into port gently — listen for a **click.**
3. Click = switch working.
4. No click = dead sensor, replace ($20-40).
2. Blow into port gently — listen for a **click.**
3. Click = switch working.
4. No click = dead sensor, replace ($20-40).
5
Replace Pressure Sensor (15 minutes)
1. Disconnect wiring and tube.
2. Release mounting clip.
3. Install new sensor ($20-40).
4. Reconnect.
5. Test with a full cycle.
2. Release mounting clip.
3. Install new sensor ($20-40).
4. Reconnect.
5. Test with a full cycle.
When to Call a Pro
- •Pressure sensor — $80-$180 installed.
- •Main board — $150-$400.
- •Internal wiring — $80-$200.
What It'll Cost You
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