Display shows E14 and the refrigerator may not enter or exit defrost correctly, with repeated frost buildup.

Safety: Unplug the refrigerator before accessing the control board. Defrost circuits are mains-powered.

Steps:

• Verify defrost components: Before blaming the board, confirm the defrost heater and defrost sensor/thermostat are functional (see E2 and E3 procedures).
• Inspect the main PCB: Look for burnt relay contacts or discoloration around the defrost relay area.
• Power reset: Perform a long power reset (15–20 minutes unplugged) to clear any temporary logic fault.
• Force defrost (technician mode): If you have access to service instructions, enter forced defrost mode and see if the heater energizes. If not, and the heater circuit is good, the board is likely faulty.
• Replace the main control board: Install a Sharp-compatible control PCB, transferring any model-specific jumpers or settings as required.

Because this fault directly affects frost control and cooling reliability, board replacement is typically a technician-level repair.