Bosch
SMU2046 UC/14 (FD 7402-7902)
Dishwasher
Bosch SMU2046 UC/14 (FD 7402-7902) — Error Code E23
Bosch SMU2046 UC/14 (FD 7402-7902) error code E23: Drain pump relay failure.
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Methodology: We combine manufacturer references with recurring service patterns, then review for safe, step-by-step repair guidance.
Sources: Manufacturer fault-code sheets, service manuals, and recurring field-repair patterns.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
Looking for the full diagnosis and repair guide? View complete Bosch Dishwasher error code E23 guide →
Repair guidance: the symptoms and steps below come from the canonical Bosch Dishwasher E23 guide and apply to SMU2046 UC/14 (FD 7402-7902) unless your manual says otherwise.
Symptoms on SMU2046 UC/14 (FD 7402-7902)
- ⚠️ Standing water in bottom after cycle
- ⚠️ Machine won't finish
- ⚠️ Wet dishes
How to Fix Error E23 on SMU2046 UC/14 (FD 7402-7902)
- 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
Questions People Also Ask for Error E23
What does Bosch Dishwasher error code E23 mean? ▼
Error code E23 on a Bosch Dishwasher means: Drain pump relay failure. The appliance detected this condition and has stopped or limited operation to prevent further damage.
How do I fix Bosch Dishwasher error code E23? ▼
First, unplug the dishwasher for 60 seconds to reset the control board. If error E23 returns, the root cause (drain pump relay failure) needs to be addressed — check connections, filters, and hoses before calling a technician.
Is it safe to use my Bosch Dishwasher with error code E23? ▼
It depends on the cause. Most E23 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.