Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Odors are generally caused by stagnant water that has pooled in a hose or by chronically dirty condenser coils. After unplugging the unit, here’s what to do:
1) Empty the reservoir, mop up any damp areas, clean the coils with a brush and a garden hose, and allow to dry in a warm place for at least 24 hours.
2) Alternatively, you can have a dehumidifier’s coils steam-cleaned at an appliance-repair or auto-repair shop, but if you do this, have the unit checked after the cleaning to be sure the electrical components haven’t been disturbed.