E5 appears on the display; compressor may not start or may shut down quickly, and the freezer warms.

Safety first: Unplug the freezer. The compressor circuit carries mains voltage. Do not attempt sealed system repairs without proper certification.

Access the compressor compartment:

• Remove the rear lower service panel to expose the compressor and control components.
• Locate the start relay/PTC and overload protector mounted on the compressor terminals under a plastic cover.

Visual and smell check:

• Look for burn marks or melted plastic on the relay or overload.
• Smell for a burnt odor, which often indicates a failed PTC relay.

Test the start components:

• Remove the relay and overload from the compressor.
• Shake the PTC relay gently; if it rattles or pieces fall out, it is likely bad.
• Measure continuity through the overload protector; it should be closed (low resistance) at room temperature.

Check compressor windings:

• With all components removed, measure resistance between the three compressor pins. You should see three finite resistances; any open circuit or direct short to ground indicates a failed compressor.

Corrective actions:

• Replace start relay/PTC and overload: If either tests bad or shows signs of overheating, install Blomberg-compatible replacements. Ensure they are firmly seated on the compressor pins.
• Inspect wiring: Repair any burned or loose wires and replace damaged connectors.
• If the compressor windings are faulty or the compressor draws excessive current and trips the overload, the compressor itself is failing and requires professional sealed system replacement.

Test: Reinstall the rear panel, restore power, and listen for the compressor starting smoothly. Monitor temperature and confirm that E5 does not return.