Vaillant Indoor Fan Motor or Capacitor Failure

Indoor unit fan does not run, but display and outdoor unit operate

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Burnt indoor fan motor windings, Failed fan run capacitor (on AC motors), Loose fan motor connector, Obstructed blower wheel

Safety: Isolate power before opening the indoor unit.

Check for obstruction: Inspect the blower wheel for foreign objects or ice. Remove any blockage.
Inspect wiring: Locate the fan motor connector on the indoor PCB and ensure it is firmly seated.
Capacitor check (if fitted): Some models use a separate fan capacitor. Inspect for bulging or leakage and replace with the same µF rating if suspect.
Test motor: If the motor hums but does not turn, or does not respond at all, replace the indoor fan motor assembly.

Hard 4/5

Indoor Fan Motor Assembly

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