Display shows E9; interior light may flicker; temperature display may be blank or frozen.

Safety first: Unplug the wine cooler before removing the control panel. Handle electronic boards by the edges to avoid static damage.

Steps to check and fix:

• 1. Remove control panel: On front-control Vestfrost models, remove the screws securing the top/front trim and gently pull the panel forward to access the display board and wiring.
• 2. Check ribbon/data cable: Ensure the ribbon or multi-pin connector between the display board and main PCB is fully seated and not damaged. Reseat both ends.
• 3. Inspect the UI board: Look for cracked solder joints at the display, burnt components, or moisture damage around the touch keys.
• 4. Clean connectors: Use electrical contact cleaner on the connectors and allow them to dry fully before reassembly.
• 5. Replace UI/display board if needed: If the board is visibly damaged or E9 persists after reseating cables, install a new Vestfrost-compatible user interface/display PCB.
• 6. Power up and test: Reassemble the panel, restore power, and verify that the display responds correctly and the E9 code is gone.
• 7. If still faulty: A communication fault can also originate from the main PCB; if a new UI board does not resolve it, the main control PCB may also need replacement.