Worcester Bosch Mechanical Noise from Fan or Pump

Boiler runs but makes a high-pitched whine or screeching noise.

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, Cavitating pump due to air or low pressure, Debris in pump impeller, Resonance in flue or casing

Safety first: Persistent unusual noises should be checked by an engineer to prevent failure.

Check system pressure: Ensure pressure is within the recommended range to prevent pump cavitation.
Bleed air: Remove air from radiators and any automatic air vents.
Engineer inspection: A technician should assess the fan and pump for bearing wear, check for debris, and secure any loose panels or flue supports causing resonance.

Medium 3/5

Combustion Fan Assembly

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