Dyson Humidify+Cool Formaldehyde Makes Whistling Noise, Service Fails to Fix It

I own a Dyson Humidify+Cool Formaldehyde air purifier, and it produces a whistling noise at low speeds. I sent the device to service three times. The first time, the fan motor was replaced under warranty, but the issue persisted. Despite clearly explaining the problem and providing sound recordings...



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