Why does the heater smell like it's burning when you turn it on?

BURNING SMELL WHEN I TURN MY HEATER ON \\ Is it normal to smell burning from furnace

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Turning on the heater could cause smoke in your home

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Why does my baseboard heater smell like it’s burning?

She said she smelled something burning in her furnace. Look what I found on her heat exchanger.

Why does my rinnai heater smell like burning plastic when I

This Furnace Malfunction KILLS PEOPLE! Homeowners Should watch (ROLLOUT GAS BURN FURNACE)