Display shows E7 and the temperature display may be inaccurate or fluctuate widely.

Unplug the unit before removing the control panel. E7 usually indicates a communication problem between the user interface and the main control board.

• Access the control panel: On Hisense wine coolers, the display is often in the door or upper front trim. Remove the trim screws and gently pull the panel forward.
• Inspect the ribbon cable: Look for kinks, cuts, or corrosion on the flat cable connecting the display to the main PCB. Reseat both ends of the cable.
• Check connectors: Ensure all plugs on the display board are fully seated. Lightly clean oxidized contacts with electronic contact cleaner and a lint-free swab.
• Inspect for moisture: Condensation can enter the panel area. Dry any visible moisture and ensure the door gasket seals properly to reduce humidity ingress.
• Reassemble and test: Refit the panel, restore power, and check if E7 clears. If the error persists, either the display PCB or main PCB may be defective.

Board-level diagnosis and replacement are best handled by an experienced technician, especially if the door wiring harness must be disassembled.