An LG LDFN4542 that leaves water on the kitchen floor has a leak, and the right way to find it is to separate the possible sources one by one. This front-control model has a door seal, a water inlet connection, a drain hose, a sump with a leak sensor and a door that opens a little at the end of the cycle for Dynamic Dry. Water can come from any of them. Before testing, dry the floor, and if the machine shows an AE code it has already detected water in the base and shut down to protect the cabinet.
The checks in more detail
Start with the door. A leak that appears at the front of the dishwasher, especially during the wash, often comes from the door seal or from suds. Look at the gasket around the tub for a fold, a tear, food or a coating of detergent, and wipe it clean. Check that dishes are not poking over the edge of a rack to block the door, and that the lower rack is pushed in.
Suds can escape around the door, so check the rinse-aid dosage and that dish soap was not used by mistake; hand dish soap foams heavily and is a classic cause of floor water. If foam is visible, run a rinse with no detergent. Then the connections. With the power off, remove the kick plate and look for drips at the water inlet valve and the supply line, and follow the drain hose to the disposer or the sink and check that its clamps are tight and that it is not cracked.
A hose that has slipped off a fitting leaks only while draining. If the base is wet but the sources above are dry, the tub or the pump seal may be leaking, which needs a technician. Do not run the machine with a known leak, because water in the base damages the controls. Quote LDFN4542S and the serial number when you contact LG.
Differential
Likely causes of “LG LDFN4542 dishwasher is leaking water”, and how to tell them apart
- 1
Suds from the wrong detergent or too much rinse aid
What separates it Foam is visible at the door and water pools in front
How to confirm Rinse without detergent and use dishwasher detergent only
- 2
A dirty or damaged door seal
What separates it Water at the front during the wash
How to confirm Clean or replace the seal
- 3
A loose supply line or inlet valve
What separates it Drips behind the kick plate
How to confirm Tighten or replace the connection
- 4
A loose or cracked drain hose
What separates it Water appears only while draining
How to confirm Check the hose and clamps
- 5
A leaking tub or pump seal
What separates it The base is wet with no external source
How to confirm Technician check
Before you touch a setting
Record this first — changing settings destroys the evidence
- Where the water first appears and when in the cycle
- Whether the display shows AE
- Whether foam is visible
- Whether dish soap or dishwasher detergent was used
Try in this order
0 of 6 completedDry the floor
ReversibleAnd note when water returns.
Check for suds
ReversibleRun a rinse with no detergent.
Clean the door seal
ReversibleAnd check for damage.
Remove the kick plate
ReversibleLook for drips at connections.
Check the drain hose
ReversibleAnd clamps.
Switch off and call LG
ReversibleIf the base is wet.
Model-specific
What is true of this model and not of its siblings
- Four sources
- The door seal, the inlet, the drain hose and the base are the usual places.
- Suds
- Hand dish soap or too much rinse aid creates foam that escapes the door.
- AE protection
- The machine shuts down when water reaches the base.
- Dynamic Dry
- The door opens a little at the end by design.
- Do not run it leaking
- Water in the base damages the controls.
- LG help
- Quote LDFN4542S and the serial number.
- Parts for this problem on the LDFN4542 (RepairClinic, 2026-09-21)
- tub seal, part number 3920DD3005H, at $65.73; drain hose, part number AEM74333104, at $66.77.
Stop boundary
When this stops being a self-service repair
- !Switch off the dishwasher at the breaker if water reaches the base
- !Do not use hand dish soap in the machine
- !Call LG for a leak you cannot trace
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why is my LG dishwasher leaking?+
The door seal, suds, a connection or the drain hose.
What does AE mean?+
Water in the base from a leak.
Is the door opening a leak?+
No, it is Dynamic Dry opening the door.
Can I keep using it?+
Not with a known leak.
Does the wrong soap cause leaks?+
Yes, hand soap foams and escapes.
Who fixes a tub leak?+
A technician.