On the covered LG dishwasher platform, PE means a water level sensor fault. First, record the code and how far the machine filled. Record the code and how far the machine filled. Check both the water supply and the drain while the code is showing.
Differential
Likely causes of “LG dishwasher code PE”, and how to tell them apart
- 1
The dishwasher's water level sensor has reported a fault (PE)
What separates it PE shows on the display and the cycle stops during the fill or the wash
How to confirm Record the code and how far the machine filled
- 2
The tub did not fill to the right level
What separates it The tub is only part full, or overfull, when the code appears
How to confirm Check both the water supply and the drain while the code is showing
- 3
A clogged filter or drain that distorts the level reading
What separates it Water drains slowly, and the sensor sees an odd level
How to confirm Clean the filter and check the drain hose
- 4
A kinked or loose pressure hose on the sensor
What separates it A hose between the sump and the sensor is pinched
How to confirm Straighten and reseat the hose
- 5
A failed water level sensor or a control board fault
What separates it The checks are clear and the code returns
How to confirm A technician tests the sensor and the board
Before you touch a setting
Record this first — changing settings destroys the evidence
- That the code is PE and not PF
- How far the tub filled when the code appeared
- Whether the filter and drain are clean
- The model number from the label on the door edge
Try in this order
0 of 12 completedWhat to do first
ReversibleRecord the code and how far the machine filled.
Correct only the documented fault domain
ReversibleFollow LG's reset for this code.
Check the model age
ReversibleLG says PE applies to certain older models, so confirm the model number against the manual before assuming this code.
Note the fill level
ReversibleRecord how far the tub filled, because the sensor exists to prevent leaks.
Request service
ReversibleLG says the PE error requires inspection by a service technician; mention that the display shows PE.
Look for suds
ReversibleIf foam is visible when you open the door, that points at detergent rather than the sensor, so drain the tub, wipe out the foam and rerun a rinse before you request service.
Record the code and the fill level
ReversibleWrite down PE and how full the tub was when it stopped, because the level tells a technician whether the sensor reads too high or too low.
Follow LG's reset
ReversibleLG's step for this code is to reset the dishwasher by turning off the power for a short time and then restarting it, so that the control starts a fresh fill.
Clean the filter and check the drain
ReversibleA blocked filter or drain hose can leave water in the tub and confuse the level reading, so clear both and run a short rinse.
Check the pressure hose
ReversibleWith the power off, look at the small hose that connects the sump to the water level sensor for kinks, cracks or a loose fitting.
Run a short cycle
ReversibleStart a short cycle and watch the fill. The tub should fill to a steady level and the wash should begin without the code.
Book service if PE returns
ReversibleIf the code comes back, a technician tests the water level sensor and the control board and replaces the part at fault.
Model-specific
What is true of this model and not of its siblings
- The code on this page
- PE, a water level sensor fault on an LG dishwasher.
- Parts involved
- The water level sensor, its pressure hose, the filter, the drain and the control board.
- LG's guidance
- Record the code and follow the reset for this code.
Stop boundary
When this stops being a self-service repair
- !Follow LG's reset for this code, and if it returns, arrange service with the model number
- !Do not run the dishwasher if it overfills or leaks
- !Switch off at the breaker before reaching into the sump
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. LG's guide is the only source for PE.
Exact questions
Common questions
What does PE mean on a LG dishwasher?+
a water level sensor fault.
Which models?+
LG says certain older models.
Why is there a sensor?+
LG says it detects the water level to prevent leaks.
Is it a leak?+
Not by itself, but an overfilled tub can leak, so stop the machine if water rises beyond the normal level.
Can a clogged filter cause PE?+
Yes, a blocked filter or drain can distort the level reading, so clean them first.
Will a power reset fix it?+
LG's step is a reset, which clears a one-off, but a repeat points to the sensor or the board.
Is the sensor an expensive part?+
It is a modest part, though the board costs more.