Wine cooler displays EC29 and may have communication issues between multiple zones or modules; one zone may not cool.

Safety first: Disconnect power before accessing any control boards or harnesses.

Step 1 – Identify affected zone

• Determine which zone (upper/lower) is not responding or cooling properly.
• Note any differences in display behavior between zones.

Step 2 – Inspect communication harness

• Access the control compartment(s) and locate the low‑voltage communication cables linking boards.
• Reseat all connectors firmly and check for pin damage or corrosion.

Step 3 – Visual inspection of boards

• Look for burn marks or obvious damage on the zone control board and main board.
• If one board shows clear damage, replacement is likely required.

Step 4 – Professional diagnosis

• Because communication faults can be complex, if reseating cables does not clear EC29, contact a Sub‑Zero authorized technician for further diagnosis.