Washer-dryer combo stops with water in the drum and displays F21; drain cycle runs for a long time.

Safety first: Unplug the unit. Have towels and a shallow pan ready; water will spill when opening the pump.

Step-by-step checks:

• 1. Access drain pump: Remove the lower front access panel or rear panel (model-dependent). Locate the drain pump at the bottom front or rear.
• 2. Clean pump filter: Place a pan under the pump. Slowly open the pump clean-out cap to let water drain. Remove lint, coins, and debris from the filter and pump housing.
• 3. Inspect impeller: Shine a light into the pump. Ensure the impeller is intact and can spin freely. Remove any obstructions.
• 4. Check drain hose and standpipe: Verify the hose is not kinked and the standpipe is not blocked. Run water through the hose with a garden hose or at a sink to confirm it is clear.
• 5. Test pump operation: After reassembly, plug in and run a drain/spin cycle. If the pump hums but does not move water, or is very noisy, replace the drain pump.