Viessmann Louver Mechanism Jam

Indoor unit louver does not move or is stuck in one position

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Possible Causes

Broken louver linkage, Stripped gears in stepper motor assembly, Foreign object jammed in louvers, Failed louver motor

How to Fix / Troubleshooting

Safety: Turn off power before manually moving louvers.

  • Remove obstruction: Inspect for and remove any objects caught in the louvers.
  • Check linkage: Remove the front cover and inspect the plastic arms and gears; replace any broken parts.
  • Test motor: With power restored briefly, activate swing mode and observe if the motor attempts to move. If not, replace the louver motor.
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Repair Difficulty

Easy 2/5

Required Part

Louver Stepper Motor
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