Bosch · Dryer
Bosch Dryer E10 Error Code
Drum drive motor not reaching speed
What this error means
E10 indicates the drum motor did not reach operating speed after start—the belt, motor, or motor capacitor failed to turn the drum at the expected RPM. You may hear a hum with no rotation, or the drum moves briefly then stops with E10.
How E10 is detected
When E10 appears on a Bosch dryer, the control board has confirmed that water did not leave the machine within the programmed drain window. On Bosch WTG86401UC, Bosch WTG865H4UC, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most E10 calls are resolved without parts: unplug and try rotating the drum by hand—it should turn smoothly with slight belt resistance. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If E10 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Broken drive belt off the motor pulley
- Motor capacitor failure on older Bosch condenser models
- Foreign object wedged between drum and cabinet
- Seized motor bearings after long idle storage
Step-by-step fixes
- 1Unplug and try rotating the drum by hand—it should turn smoothly with slight belt resistance
- 2Remove any visible obstruction through the lint filter opening only—do not reach into moving parts powered
- 3Reset breaker thirty seconds and run a short timed cycle with an empty drum
- 4Listen for motor hum without drum movement—that pattern confirms drive failure
When to call a technician
Empty-drum E10 after reset requires belt, capacitor, or motor replacement with rear-panel access.
Affected models
- Bosch WTG86401UC
- Bosch WTG865H4UC
- Bosch WQB245B0UC
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dryers to prevent E10 from lint and food debris buildup.
- Record when E10 appears in the cycle and whether it clears after a 60-second power reset on your Bosch dryer—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for E10; Bosch uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting E10; reversed plugs on pumps and valves cause immediate repeat faults.