Bosch
Dishwasher
✅ Safe for Now
Bosch Dishwasher Error Code E21
Bosch Dishwasher error code E21: Drain pump malfunction.
Should I unplug it?
✅ No — safe for now
Safe to leave off. Fix soon — water backup can cause mold or floor damage.
Can I fix it myself?
DIY Possible
Part: Drain pump / drain hose / filter
How much will it cost?
DIY: $0–$150 (pump or hose)
Technician: $100–$300
⏱ 20–45 min
What Does Error E21 Mean on Your Bosch Dishwasher?
Bosch Dishwasher error code E21: Drain pump malfunction.
What typically fails: Drain pump / drain hose / filter
What You're Probably Seeing
- → Standing water in bottom after cycle
- → Machine won't finish
- → Wet dishes
How to Fix It Yourself
- 1 Unplug the dishwasher for 60 seconds then plug back in — this resets the control board and clears many temporary faults
- 2 Check and clean the drain pump filter (usually behind a small door at the bottom front)
- 3 Inspect the drain hose for kinks, blockages, or improper height
- 4 Test the drain pump — if it hums but won't move water, replace it ($50–$120 part)
- 5 If the error persists after basic troubleshooting, contact a qualified appliance technician
🛠️ You'll need: Screwdriver set, Bucket, Wet/dry vacuum
· Time: 20–45 min
💡 Try this first: Unplug the appliance for 60 seconds, then plug back in. This resets the control board and clears many temporary faults.
Questions People Also Ask
What does Bosch Dishwasher error code E21 mean? ▼
Error code E21 on a Bosch Dishwasher means: Drain pump malfunction. The appliance detected this condition and has stopped or limited operation to prevent further damage.
How do I fix Bosch Dishwasher error code E21? ▼
First, unplug the dishwasher for 60 seconds to reset the control board. If error E21 returns, the root cause (drain pump malfunction) needs to be addressed — check connections, filters, and hoses before calling a technician.
Is it safe to use my Bosch Dishwasher with error code E21? ▼
It depends on the cause. Most E21 errors mean the appliance has stopped itself as a safety measure. Check the 'Should I unplug it?' section above for specific guidance on this error.