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LG Dishwasher Error Code F31: Meaning and Fix

F31
How F31 appears on a LG dishwasher display.
Generic LG dishwasher image (main control board); the F31 code is not tied to one single part
Sears PartsDirect product image (LG OEM part EBR79686304)

Reading the dishwasher display

A dishwasher reports its fault in the display window, or by blinking a cycle light a set number of times with a pause between groups. Count the blinks and pauses before opening the door. LG codes are short letter pairs; a capital O differs from a zero.

LG appliances show short alphabetic codes (OE, IE, UE on washers, Er plus letters on refrigerators) and, on ThinQ models, a Smart Diagnosis option. LG also builds many Kenmore Elite units. The codes apply to model numbers such as LDF7774ST, LDT5678SS and DLEX3900B; check the label on your unit to confirm yours.

What causes F31

How to fix it

  1. Switch off power for a minute.
  2. Restart a cycle.
  3. Do not pour water in the blower.
  4. Request service.

Questions

Which models?

Dynamic Heat Dry.

DIY?

No.

Does it affect cleaning?

Mostly drying.

Other LG dishwasher codes

Float switch for an LG dishwasher, a part commonly involved in the AE codeAELeak detectedWater inlet valve for an LG dishwasher, a part commonly involved in the FE codeFEOverfill errorWater inlet valve for an LG dishwasher, a part commonly involved in the IE codeIEWater inlet errorDishwasher filter for an LG dishwasher, a part commonly involved in the OE codeOEWater outlet errorGeneric LG dishwasher image (main control board); the tE code is not tied to one single parttETemperature sensor errorHeating element for an LG dishwasher, a part commonly involved in the HE codeHEHeater error

Sources

Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.

Applies to models including LDF7774ST, LDT5678SS, LDP6797ST, LDFN4542S, SDWB24S3.