Large stainless refrigerator set flush between kitchen cabinets
12 components covered

Field manual · Dishwasher

LG dishwasher (QuadWash / TrueSteam): field service manual

Covers: LG 24 in built-in dishwashers including QuadWash and TrueSteam (LDT/LDP/LDF/LDTS/LSDT series), roughly 2014 onward.

Single sourceBrands: LG12 components

LG uses an inverter direct-drive wash motor (no belt), a separate drive for the QuadWash multi-motion arms, a drain pump, a heater, a temperature sensor, a float-type leak sensor in the base and, on TrueSteam models, a steam generator. Vario spray models have a motor/valve that splits flow (nE code). Codes are two letters (OE, IE, AE, FE, HE, tE, bE, nE, LE).

Safety first

  • Breaker and water off before opening panels.
  • Watch for glass in the sump.

How it works

Fill: the inlet valve fills to level; if level stays low for about 10 minutes the unit shows IE. LG install guides ask for hot supply at 120-149 °F; above 149 °F connect to cold. Pressure limits vary by model (20-80 psi on some guides, 20-120 psi on others); check the model's guide and add a pressure reducer when above its maximum.

Wash: the inverter direct-drive motor turns the wash pump; QuadWash arms rotate and sweep at the same time. On Vario models a motor/valve shifts spray intensity and zones; a dish touching the impeller or a bad Vario unit sets nE.

Steam: TrueSteam models heat a small amount of water into steam before the main wash to soften baked-on soil. Scale in the generator reduces steam output.

Heating: a heater and temperature sensor control wash/rinse temperature; HE = not heating, tE = sensor fault.

Drain: drain pump empties the tub; OE if not draining. LG asks that the drain hose end be held up about 12 in (30 cm) above the floor to stop back-siphon.

Flood and suds protection: a float in the base pan sets AE; excess water/overfill FE; suds bE. Oversudsing from hand soap is a common trigger for all three.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Large stainless refrigerator set flush between kitchen cabinets by Alex Qian, Pexels License

Diagnostic guides for this appliance

Component test · Dishwasher

How to test a dishwasher heating element

Many US dishwashers have a hidden or visible loop element under the tub. A good one reads in the tens of ohms. A leak to the tub trips the GFCI even when the resistance looks fine, so always check to ground.

5 steps ~20 mineasy
Component test · Dishwasher

How to test a dishwasher circulation (wash) pump motor

The wash motor pushes water to the spray arms. Older units use an AC induction motor; many newer ones use a brushless DC motor driven by the board. Rule out a jam and a filter clog before testing, and use the tech sheet for winding values.

6 steps ~45 minmoderate
Component test · Dishwasher

How to test a float switch (dishwasher overfill and similar)

A float rides up with water and opens or closes a small switch under the tub. It stops overfill or flags a leak. Make sure the float moves freely before blaming the switch.

6 steps ~20 mineasy

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LG dishwasher (QuadWash / TrueSteam): field service manual · OnCall Tech