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Induction cooktop buzzing, humming, whining or clicking

Most induction noise is normal: the magnetic field makes the pan vibrate (worse with thin or layered-base pans and at high power), the electronics click as they pulse power at low settings or share power between zones, and a cooling fan runs during and after cooking. A fault is a sound that is new and much louder than before, mechanical (grinding, rattling, whining that tracks the fan), present with no pan, or comes with error codes, a silent fan or a cracked glass top.

Cross-checked ~40 min moderateBrands: All

Before you start

Induction power boards carry line voltage and large filter capacitors that can hold a charge after power is removed: breaker off, wait several minutes and verify 0 V before touching internal parts
Cooktops are usually hard-wired 240 V: turn off the breaker, not just the controls
Stop using the cooktop if the glass is cracked or the cooling fan is dead
Live voltage checks are for trained techs only

Diagnostic steps

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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