Truma Mover Smart M – High-Pitched Whine

[Clem]

Symptom:

• Loud, high-pitched whine from mover motor/gearbox during operation.

Cause (diagnosed after dismantling):

• Water ingress into the motor housing.
• Water pooled around the lower rotor bearing.
• Resulting rust on the rotor shaft (where it enters the gearbox).
• The rusted rotor spinning at high speed generated the whining noise.
• Likely gear oil contamination from water and rust particles.

Fix:

1. Dismantled motor and integrated gearbox.
2. Cleaned rotor shaft and removed rust.
3. Re-assembled — noise returned to normal (whine gone).
4. Planned replacement of gear oil (to remove contaminated lubricant).
5. Sealed the motor housing during reassembly to prevent future water ingress.

Outcome:

• Motor operates quietly again.
• Preventative sealing should extend lifespan and avoid recurrence.