Safety first: If you smell burning plastic or see smoke, unplug the freezer immediately and do not continue to operate it.

Steps to investigate odors:

Initial cleaning: For new units, a mild plastic smell can be normal. Wipe interior surfaces with a mild baking soda solution and ventilate.
Inspect rear compartment: With power disconnected, remove the rear panel and look for discolored or melted wiring, especially near the compressor and control board.
Check defrost area: Remove the interior rear panel and inspect the defrost heater for foreign objects (plastic packaging, food) that may be melting during defrost. Remove any debris.
Repair damaged wiring: Replace any burnt wires or connectors with proper gauge and insulated terminals. If the control board is scorched, replace the main control board.
Professional evaluation: If the compressor itself smells burnt or trips breakers, discontinue use and call a technician.

Warning: Do not ignore persistent burning smells; they can indicate a fire hazard.

Freezer interior has strong chemical, plastic, or burning smell during operation.

Possible Causes