Bosch Dryer Not Spinning — Belt, Motor & Control Board Diagnosis
When a Bosch compact dryer powers on but the drum does not spin, the issue is in the drive chain: belt, tensioner, motor, or the motor control circuit on the board. Bosch WTW/WGA series use a brushless EcoSilence Drive motor connected to the drum via a poly-V belt and spring tensioner.
Quick Diagnostic Check
Open door, spin drum by hand:
- Spins very freely (no resistance): Belt is broken. Motor can't connect to drum.
- Spins normally but doesn't move during cycle: Motor or control board not activating.
- Won't spin at all (seized): Bearing failure or object jamming drum.
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Gas leak detector ($130), thermal fuse tester ($95), belt tension gauge, and vent inspection camera ($180). Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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Most Common Causes
1. Broken Drive Belt (45% of cases)
The poly-V belt (BSH 00491680) is the most common failure. After 5–8 years, it breaks. Drum spins freely by hand with zero resistance.
Replacement: Remove top panel (2x Torx T20), front panel (clips + screws). Route new belt around drum exterior, under tensioner, around motor pulley. Ensure V-grooves face inward toward drum.
DIY Difficulty: Moderate Parts Cost: $25–$45 Professional Repair Cost: $150–$280
2. EcoSilence Motor/Board Fault (25% of cases)
Motor receives no drive signal. Could be: motor winding failure (rare with brushless), inverter circuit on control board (more common), or motor thermal protection tripped from overload.
Diagnosis: Belt intact, drum has normal resistance. Start cycle — listen for any motor sound. Nothing = electrical fault.
DIY Difficulty: Advanced (diagnosis) Parts Cost: $150–$350 Professional Repair Cost: $280–$500
3. Seized Tensioner (15% of cases)
Tensioner pulley bearing seized — belt cannot move even though intact. May hear motor straining briefly before thermal protection cuts it.
Fix: Remove top panel. Spin tensioner by hand. Seized = replace ($20–$45).
DIY Difficulty: Easy-Moderate Parts Cost: $20–$45 Professional Repair Cost: $120–$220
4. Overload Protection (10% of cases)
Excessively heavy or wet load (e.g., king comforter) exceeds motor starting torque. Motor protection trips. Reduce load, restart.
Parts Cost: $0
5. Door Switch Not Confirming (5% of cases)
If the door interlock does not confirm closed, the motor will not start. See door latch guide.
Parts Cost: $25–$60
Step-by-Step
- Hand-spin drum — assess resistance level.
- Check belt (top panel removal) — intact and on pulleys?
- Spin tensioner by hand — smooth?
- Listen for motor activation at cycle start.
- Check for error codes (E:02 = motor/drive).
- Reduce load if overstuffed.
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DIY Fix vs Professional Repair
| Issue | DIY? | Parts Cost | Professional Cost |
|---|---|---|---|
| Belt | Moderate | $25–$45 | $150–$280 |
| Motor/board | Advanced | $150–$350 | $280–$500 |
| Tensioner | Easy-Moderate | $20–$45 | $120–$220 |
| Overload | N/A | $0 | N/A |
| Door switch | Easy | $25–$60 | $89–$180 |
FAQ
Q: My Bosch dryer drum spins super easily by hand. What broke?
The drive belt. When the belt breaks, there is no mechanical connection between motor and drum. The drum spins with almost zero friction. Replace belt BSH 00491680.
Bosch dryer not spinning? Our technicians carry belts and diagnostic tools for WTW/WGA compact dryers. Schedule a repair →
