Display shows E7 and the unit may not respond properly to temperature settings or may shut down unexpectedly.

Safety: Disconnect power before accessing the control board. Use surge protection on the outlet to prevent future damage.

Steps to address E7:

• Power reset: Unplug the cooler for at least 10 minutes to allow capacitors to discharge and memory to reset. Plug back in and check if E7 returns.
• Check power quality: Ensure the cooler is plugged directly into a properly grounded outlet (not a high-load power strip). Avoid sharing the circuit with heavy appliances that cause voltage dips.
• Access the main control board: Remove the rear or top service panel (depending on model) to expose the board.
• Inspect connectors: Reseat all harness connectors to the board, ensuring they are fully engaged and not corroded.
• Look for board damage: Check for burnt components, bulging capacitors, or signs of moisture damage.
• Replace the main control board: If E7 persists after reset and inspection, the EEPROM or microcontroller is likely corrupted. Install a new EdgeStar-compatible main control board, transferring any jumpers or settings as specified in the service documentation.

Note: After replacing the board, reprogram temperature setpoints and any dual-zone configuration as needed.