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LG dishwasher code F31: meaning and safe checks

F31 means: the heat dry fan motor does not operate — LG's own wording. LG states F31 applies only to models featuring Dynamic Heat Dry. Scope: LG dishwashers. F31, F35 and F37 apply only to models with Dynamic Heat Dry or Auto Open Door; CL and PF are indicators rather than faults.

Direct answer

On the covered LG dishwasher platform, F31 means the heat dry fan motor does not operate — LG's own wording. LG states F31 applies only to models featuring Dynamic Heat Dry. First, confirm the model has Dynamic Heat Dry before treating this as its code.

Definition versus diagnosis

The display names a detected condition—not an automatically failed part.

KnownThe exact manufacturer definition and operating state shown above.Not yet provenA replacement component, wiring fault or internal cause without controlled isolation.Next evidenceThe first safe observation or test in the ordered checklist below.

What this covers

  • LG dishwasher models covered by the cited manufacturer code family
  • Displayed code or documented alias: F31
  • The operating stage and conditions described by the source

What it does not cover

  • ×Another appliance type or original-manufacturer platform
  • ×A code that merely resembles these characters
  • ×Internal live electrical, gas, sealed-system or control-board repair
Try in this order0 of 4 completed

  1. Verify the exact code and model

    Reversible

    Photograph the complete display and model label. Code aliases in this record: F31. LG dishwashers. F31, F35 and F37 apply only to models with Dynamic Heat Dry or Auto Open Door; CL and PF are indicators rather than faults.

  2. Perform the first non-destructive check

    Reversible

    Confirm the model has Dynamic Heat Dry before treating this as its code. Do not clear the display before recording the operating stage and remaining water, heat or load state.

  3. Correct only the documented fault domain

    Reversible

    LG states the issue lies with the fan motor or one of its components and directs it straight to service. Do not substitute a similar brand or product code table for the exact model manual.

  4. Verify or escalate

    Reversible

    Run only a safe short test that reaches the original stage. If F31 returns, stop repeated resets and use model-specific manufacturer service.

Evidence ledger

Sources behind this answer

Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.

01
LG USA Support[LG Dishwasher] Guide to Error Codes

LG's own dishwasher error-code guide, read in a rendered browser 2026-08-20; the previous citation was the help-library root.

Exact questions

Common follow-ups

What does F31 mean on a LG dishwasher?+

the heat dry fan motor does not operate — LG's own wording. LG states F31 applies only to models featuring Dynamic Heat Dry.

Can I reset F31 without fixing the cause?+

A reset may clear the display temporarily but does not correct the documented fault domain. Record the code and complete the safe checks first.

Why do I need the complete model number?+

Manufacturers reuse characters across different controls and product platforms. The full model identifies which official code table and service data applies.

When should I stop troubleshooting?+

LG publishes no customer-accessible step for F31. It is a service call.

Change recordAug. 17, 2026 — Published from the cited first-party LG code reference with explicit product scope and reset limits.
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