PE3
LG Dishwasher
Severity: ModerateWhat Does This Error Mean?
The PE3 error on an LG dishwasher indicates a problem with the zone wash motor or the half-load wash system. This error appears when the dishwasher cannot correctly direct water to the selected wash zone. It is related to the PE and PE2 errors, but specifically affects a third motor or pump stage.
Affected Models
- LDP6797ST
- LDT7808ST
- LDFN4542D
- LDT5678ST
- LG dishwashers with upper/lower zone wash feature
Common Causes
- The zone wash motor responsible for the third water flow stage has failed
- Debris is blocking the zone selector valve, preventing it from switching correctly
- The wiring harness to the zone wash motor is loose or has a damaged connector
- The main control board is not correctly sending commands to the zone wash pump
- Scale or mineral buildup inside the zone valve has prevented it from opening or closing
How to Fix It
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Press and hold the Start button for 3 seconds to cancel the current cycle.
Cancelling allows the dishwasher to drain fully before you do anything else.
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Remove the lower rack and the filter assembly at the bottom of the tub.
Rinse the filter under warm running water and scrub it gently with a soft brush.
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Check the area around the spray arm and sump for broken glass or food debris.
Even small fragments can jam the zone valve and prevent it from switching zones.
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Run a hot water rinse cycle using white vinegar — add 1 cup to the bottom of the empty tub.
Vinegar dissolves mineral scale that can jam the zone valve and related plumbing.
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If PE3 returns after cleaning, stop using the dishwasher and call a technician.
Repeated cycles with a faulty zone motor can put added strain on the control board.
When to Call a Professional
The PE3 error requires a technician in most cases. The zone wash motor, pump assembly, or control board needs professional testing to isolate the fault. Attempting this repair yourself involves disassembling the sump area, which requires experience. Typical repair costs are $140–$280 depending on which component has failed.
Frequently Asked Questions
What is the zone wash feature that PE3 is related to?
LG dishwashers with zone wash let you wash only the top or bottom rack at full power. This saves water and energy when you only have a half load. The dishwasher uses a special motor to direct all water pressure to one zone. PE3 means this zone-switching motor has a fault.
Can I still use the dishwasher with the PE3 error?
The dishwasher may still run a full wash cycle if the standard wash motor is working. However, half-load or zone wash modes will not work correctly. Repeat PE3 errors can indicate increasing motor wear, so it is best to schedule a repair promptly.
How is PE3 different from PE and PE2 on an LG dishwasher?
PE, PE2, and PE3 all relate to the zone wash system. PE typically points to the first zone motor stage, PE2 to the second stage, and PE3 to a third motor or electrical stage. All three errors require professional diagnosis to determine exactly which motor or circuit is at fault. A technician with an LG diagnostic tool can pinpoint the failed component quickly.