Dry Only on the WM3998HBA is selected from the Dry control without choosing a wash cycle. A preparatory spin can be part of combo operation. If you want to omit that spin, verify the Spin selection before starting rather than treating motion as proof that washing began.
Models covered
WM3998HBA conventional ventless washer/dryer combo, MFL71728991 family manual. Not the newer heat-pump WashCombo interface.
Wait for motion to stop and the door or lid to unlock. Water may be hot. Isolate power and follow the exact manual before any user filter maintenance. Never open a filter against a full drum, force a lock or bypass an interlock.
Compare the behavior
Match the documented control, cycle or feature before interpreting the result. The comparison below keeps normal model behavior separate from an unresolved fault.
| Observed state | Interpretation / next step |
|---|---|
| Dry selected with a spin setting | Preparatory spin may occur. |
| Wash cycle chosen first | Recheck selection for the dry-only task. |
| Damp finish selected | Some retained moisture is intentional. |
Model-specific checks
Start from the correct control
Power on, choose the required drying selection using Dry, and use Start/Pause. Do not turn the wash-cycle selector first if the task is a dry-only load. The exact manual’s Only Using a Dry Function section is the applicability reference; the wash cycle name should not be the basis for choosing a drying setting.
Watch the spin indicator, not just the drum
LG’s combo support explains that the dry process may include an initial spin. If no preparatory spin is wanted, check the model’s No Spin selection before starting. A drum turning at the beginning does not establish that detergent and wash water are being used.
Different fabrics need different end points
Choose a drying setting suitable for the care label, not merely the longest time available. A selected damp finish is different from a failed attempt to reach a normal dry finish. Avoid repeatedly restarting an unsuitable cycle just because the first few minutes look unfamiliar.
What to record next
A preparatory spin at the beginning of drying does not by itself mean a wash cycle was selected. Compare the selected function with the actual water and detergent activity before stopping or restarting the load.
When to stop and get help
Only carry out maintenance permitted in your model’s manual. For service, note the full model number and suffix, displayed code, selected cycle and what happened during the checks. Leave internal wiring, gas components, pumps and safety devices to a qualified professional. A symptom alone does not identify a failed part.
Sources & references
- Manual includes Only Using a Dry Function and drying-level selections. Operation: Dry
- A preparatory spin can be included; Spin selection controls omitting it. How to Use Dry Only transcript
Based on publicly available manuals, manufacturer support and the references listed here. We have not inspected or tested your appliance. Follow the instructions for your exact model; a guide cannot replace an in-person diagnosis.