What F31 (Heat Dry Fan Issue) Means
F31 applies specifically to models with Dynamic Heat Dry and displays when the heat dry fan motor doesn't operate, per LG's dishwasher Help Library article, which states this needs inspection from a service technician.
Common Causes of F31 (Heat Dry Fan Issue)
- Heat Dry fan motor has failed
- A component of the fan motor assembly has failed
🔧 One Safe Check You Can Try
There's no owner-level fix documented for F31 - request service, since LG attributes it to either the fan motor or one of its components.
⚠ Why You Shouldn't Go Further Than That
- LG goes straight to requesting service for this code, since it doesn't specify a homeowner-safe diagnostic step to distinguish a motor fault from a component fault.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.