Gree Dehumidifier Recall
A large manufacturer of many common dehumidifiers sold under various brand names has recently recalled its units because of a risk of fire.
Gree Announces Dehumidifier Recall
If you are using any of the dehumidifiers listed in the above link, please discontinue their use immediately and contact Gree for a refund.
Note that in general, dehumidifiers need to be maintained in order to run efficiently and safely. Most have an air filter that should be cleaned periodically in order to minimize risk of fire, and most have minimum distances that must be maintained from other items to ensure safe operation.