Kerosine reddy heaters all make some smoke. they operate by creating air pressure that passes through a nozzle venturi that sucks fuel from a reservoir and out through a fan pattern nozzle. a spark plug or a hot surface igniter fires the mist that comes out. the blower re-enforces the fire by creating a draft out the front of the heater. when the heater shuts down whatever residual flow is coming out of the nozzle contacts the hot internal surface and smokes.
If this is a kerosene heater,the wick is most likely not adjusted up enough,or the wick is contaminated.The fuel could be contaminated also.Remove the old wick and replace it,and refuel it with clean kerosene,after you pour the old out.
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