E8 appears and the freezer may not maintain temperature; compressor may run continuously or not at all.

Safety first: Disconnect power before accessing rear or control panel areas.

Locate ambient sensor:

• On many Blomberg freezers, the ambient NTC is mounted near the condenser or in the control housing to sense room temperature.
• Consult the wiring diagram (often on the rear panel) to identify the ambient sensor location and connector.

Inspect and test:

• Check the sensor body and wiring for heat damage or cuts.
• Disconnect the sensor and measure resistance at room temperature; compare to typical NTC values (several kΩ). Open or short readings indicate failure.
• Verify the connector at the main PCB is fully seated and clean.

Corrective actions:

• Replace sensor: If readings are out of range, install a new Blomberg-compatible ambient NTC sensor. Mount it in the original location away from direct heat sources.
• Repair wiring: Replace any brittle or burned wires and secure them away from hot compressor and condenser tubing.
• If sensor and wiring are good but E8 persists, the main control board may be misreading the sensor and require replacement.

Test: Restore power and allow the freezer to run for several hours. Confirm stable operation and that E8 does not reappear.