Display shows E8; compressor may not run; interior light and display may still work but no cooling occurs.

Safety first: Unplug the freezer before opening any control housings. Capacitors on the PCB can retain charge; avoid touching components unnecessarily.

Step-by-step checks:

• 1. Confirm basic power: Verify that the outlet has correct voltage and that the freezer's plug and cord are intact.
• 2. Observe behavior: If the display works but the compressor and fan never start and E8 is shown, suspect a control issue.
• 3. Access main PCB: On many Gram freezers, the main PCB is located in a control box at the rear or top. Remove the cover screws and carefully open the housing.
• 4. Visual inspection: Look for burnt areas, swollen capacitors, or discolored components. Check that all connectors are fully seated.
• 5. Connector reseat: Disconnect and reconnect the harness plugs one at a time to ensure good contact.
• 6. Functional test: If no obvious damage is visible and reseating connectors does not clear E8, the PCB is likely internally faulty.
• 7. Replace PCB: Order a Gram-compatible main control PCB using the model and serial number. Transfer any jumper settings or wiring exactly as on the original board.

When to call a technician: If you are not confident handling electronic boards or if the new PCB requires programming, have a Gram technician perform the replacement.