Display shows E14 and the refrigerator may run continuously or not reach the set temperature.

Warning: The main control board operates at mains voltage. Unplug the refrigerator before accessing it. If you are not comfortable working with electronics, contact a technician.

• Power reset: Disconnect power for at least 10 minutes to reset the control logic. Reconnect and observe operation.
• Check for visible damage: Access the main PCB (usually behind a rear cover or top panel). Look for burned components, swollen capacitors, or scorch marks.
• Verify sensor connections: Ensure all temperature sensor connectors are firmly seated on the PCB. A loose sensor can cause the board to misregulate temperature.
• Inspect relays: If accessible, check that compressor and fan relays are not visibly burned. However, detailed relay testing typically requires professional tools.
• Replace main PCB: If there is clear evidence of board failure or if E14 persists after all sensor and wiring checks, replace the main control board with the exact Grundig part number. Transfer any configuration jumpers as per service documentation.
• Reassemble and test: Restore power and monitor temperatures over 24 hours to confirm stable operation and clearance of the E14 code.