Diagnosis
The high-pitched buzz is caused by the triac, a solid-state switch on the mainboard that rapidly pulses power to the heating plates to maintain the set temperature. This is especially audible on higher heat settings where more frequent pulsing is required. While common, excessive noise can sometimes indicate a poor power connection or a component under stress.
How to Fix It
First, ensure the iron is getting clean, stable power. Plug it directly into a wall outlet—avoid power strips, extension cords, or outlets shared with high-draw appliances like microwaves. If the noise persists, try these steps:
- Unplug the iron and let it cool completely.
- Inspect the power cord for any damage, kinks, or fraying.
- Check that the plates are clean and free of product buildup, which can cause the thermostat to work harder.
- Plug it into a different, dedicated wall outlet in another room to rule out a circuit issue.
If That Didn't Work
If the buzzing remains loud and consistent after trying the above, it is likely a characteristic of your specific unit's electronics. However, you must monitor for signs of failure:
- Immediately stop using it if you detect any burning odor, see sparks, or notice the LED display flickering.
- If the buzzing changes in pitch or is accompanied by a loud crackling or popping sound, this indicates internal arcing and a serious fault.
- In these cases, the main control board is likely failing and the iron should be unplugged and serviced or replaced.
Heads Up
The initial buzzing during heat-up is generally harmless. However, using the iron on a low-quality power source can worsen the noise and potentially damage the internal components over time. Always handle the plates with care when cleaning to avoid damaging the temperature sensor.