Freezer displays E6; interior lights and display may work but compressor does not run.

Safety first: Unplug the freezer before accessing the control board. Capacitors on the PCB can hold charge briefly.

• Power reset: Leave the unit unplugged for at least 10–15 minutes to allow the control to fully discharge. Plug back in and check if E6 clears.
• Access main PCB: On most Hisense freezers, the main control board is behind a rear metal or plastic cover near the compressor area. Remove screws and cover.
• Inspect visually: Look for burnt components, bulging capacitors, or darkened areas on the PCB. Check for insect damage or moisture corrosion.
• Check connectors: Reseat all harness connectors one by one, ensuring they are fully latched. Look for bent pins or green/white corrosion.
• Check for shorts: If you see obvious burn marks or smell burnt electronics, the board is likely defective and should be replaced.
• Replace PCB: Order a Hisense-compatible main control board using the model number. Transfer any jumper settings or wiring exactly as on the original. Take photos before removal to ensure correct reconnection.

If E6 persists after board replacement, there may be a wiring harness fault or another component shorting the control, which should be investigated by a technician.