WAT28400UC F21 error
Your Bosch WAT28400UC is showing F21. Before replacing parts, confirm the model tag matches WAT28400UC: Open the door and check the rim or door frame; the silver sticker is also on the rear panel near the top. On this Bosch washer, F21 means Motor fault — drum not turning properly. The steps below follow the field-service order for the WAT28400UC platform — not the generic Bosch F21 page. Cross-check part fit with WAT28400UC before ordering — use the model-specific parts diagram. If the code cleared after a reset but returned mid-cycle, treat that as a confirmed fault rather than a one-time glitch.
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Fix steps
- Verify the model tag reads WAT28400UC — Open the door and check the rim or door frame; the silver sticker is also on the rear panel near the top.
- Reset F21: unplug the washer or switch off the breaker for 5 minutes, then restore power.
- Check inlet hoses, drain hose routing, and the door seal for obstructions or leaks before assuming an internal component failed for F21.
- Cross-check part fit with WAT28400UC before ordering — use the model-specific parts diagram.
- Run a test cycle after repair. If the code returns, use the compatible parts below or the full brand code guide.
Repair guidance is for informational purposes only. We do not guarantee that any fix will resolve your issue, and you assume all risk when following these steps. Terms & disclaimer
FAQ
What does F21 mean on a Bosch WAT28400UC?
Motor fault — drum not turning properly.
How do I reset F21 on a WAT28400UC?
Unplug the washer or switch it off at the breaker for 5 minutes, then restore power and restart. If F21 returns on the WAT28400UC, the underlying fault is still present.
What part do I need for WAT28400UC F21?
Try the reset and troubleshooting steps first. F21 on the WAT28400UC is not always a failed part.
Is F21 on the WAT28400UC easy to fix?
Many owners fix this themselves with basic tools. Start with the reset and steps above, then check compatible parts below.