Saunier Duval Fan or Pump Noise / Resonance

Furnace emits a high-pitched whine or humming noise during operation

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

Worn fan bearings,Resonance between fan and flue,Noisy circulation pump,Loose mounting brackets

Safety first: Isolate power before touching moving parts.

Identify source: Listen carefully to determine whether the noise comes from the fan area (top) or pump/hydraulic block (bottom).
Tighten fixings: Check and tighten mounting screws for the fan, pump, and casing panels.
Inspect fan and pump: If bearings are noisy or there is excessive play, plan to replace the fan assembly or pump head.
Flue support: Ensure the flue is properly supported and not transmitting vibration into the building structure.

Medium 3/5

Flue Fan Assembly

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