F2
Philips Ultrasonic Transducer / Nebulizer Fault

Philips ultrasonic humidifier displays F2 and stops misting; water is present in the tank.

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Safety Warning

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.

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Possible Causes

Failed ultrasonic transducer disc, Heavy limescale buildup on transducer surface, Damaged transducer wiring, Faulty driver circuit on PCB

How to Fix / Troubleshooting

Safety: Unplug the humidifier. Do not touch the transducer while powered.

  • Inspect transducer: Remove the water tank to expose the ultrasonic transducer in the base (a small metal disc). Check for white scale or cracks.
  • Descale: If scaled, apply a small amount of white vinegar to the disc and let sit for 5–10 minutes. Gently wipe with a soft cloth or cotton swab. Do not use sharp tools.
  • Rinse and dry: Wipe away all vinegar and moisture before reassembling.

If F2 persists and the transducer does not vibrate (no visible mist when tested briefly), the transducer or its driver circuit is likely defective. Replacement of the transducer module or main PCB is required and is best done by a Philips service technician.

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Repair Difficulty

Medium 3/5

Required Part

Ultrasonic Transducer
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