LG LDFN4542S how to clean the air gap

When the dishwasher drains poorly or shows OE, if the sink has a drain air gap.

You need

• Toothpick or small brush

Steps

1. Turn off the dishwasher.
2. Remove the air gap cover on the sink and the plastic cap under it.
3. Clear out debris with a toothpick or brush.
4. Refit the plastic cap and the cover.

Source: Maintenance: Cleaning the Air Gap Source: Maintenance: Cleaning the Air Gap, p. 34

Used for

• OE: Drainage problem: water is not pumping out.
• Dishwasher is not draining well

Other LDFN4542S procedures

• How to clean the filtersAfter each load for best results. With hard water, at least once a month with a soft brush. Also when OE appears or water drains poorly.
• How to clean the spray armsEvery two weeks, and when dishes come out dirty because spray holes are blocked.
• How to run Machine CleanOnce a month or every 30 cycles, when the Machine Clean icon flashes, or after a long period unused (then without any cleaning agent).
• How to change the rinse aid settingRaise it for spots, streaks, calcium build-up or poor drying; lower it if the dishwasher foams.

Sources

1. Owner's Manual, Dishwasher LDF554 and LDFN454 models (abridged edition). LG Electronics Inc. Document MFL69261755, revision Rev.00, 2023-09-04, 48 pages, en-US. gscs-b2c.lge.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.

Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.

Applies to

LDFN4542S (variant LDFN4542S.ASSESNA), LDFN4542W (variant LDFN4542W.ABWESNA), LDFN4542B (variant LDFN4542B.ABPESNA), LDFN4542D (variant LDFN4542D.ABDESNA). United States and Canada.

Source

Owner's Manual, Dishwasher LDF554 and LDFN454 models (abridged edition), MFL69261755 revision Rev.00, 2023-09-04

Last verified

13 November 2026

Handbook

LG LDFN4542S dishwasher in Dishwashers; all LG handbooks