OP, previous replies appear to have hit all of the probably causes for the odor. You may need to look at the instruction manual for the location and how to remove and clean the filter, ours a Whirlpool is real simple, some others not so simple. Also, look at the heater coil (if you use the heated dry option) and see if there is anything trapped to melted in this location.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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