Why Do Electric Heaters Make Noise? 5 Common Reasons Virtually all electric heaters make some sort of sound. Crackling, popping, humming, and buzzing are all very common. But why do electric heaters make noise? If your electric heater is making noise, here are a few possible causes: The heater makes a popping sound when it expands. The fan is making noise. The electric coil heater is vibrating. The screws holding the heater together are loose. The mounting brackets aren’t installed correctly.
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