The freezer is not cooling at all: The interior is warm, the compressor is not running, and the display may be on.

Safety: Unplug the freezer before accessing the compressor area. High voltage and hot surfaces are present when the unit is running.

Steps:

• Listen for activity: After plugging in, listen for a humming or clicking from the compressor. Repeated clicking without the compressor running suggests start device issues.
• Access compressor: Remove the rear lower cover to expose the compressor and its start device.
• Inspect start relay/PTC: Remove the plastic start device from the compressor terminals. Shake it gently; if it rattles or shows burn marks, it is likely faulty.
• Test compressor windings: With power disconnected, measure resistance between the compressor terminals. All readings should be finite and not shorted to ground. If the windings are open or shorted, the compressor is defective.
• Replace start device: If the compressor tests good, install a Bosch-compatible start relay/PTC and overload protector.
• Control board check: If the compressor and start device are good but never receive power, the main control module may be faulty and require replacement.

Warning: Compressor replacement and refrigerant handling must be performed by a certified refrigeration technician.