E18 error, unit may not start; often associated with internal communication issues.

Safety: Disconnect power before removing any control covers.

• 1. Inspect control connections: Remove the front panel and locate the ribbon cable or harness between the display (user interface) and the main control board. Reseat both ends.
• 2. Check for moisture: Look for signs of water intrusion or condensation on the control boards. Address any leaks before replacing electronics.
• 3. Visual inspection: Examine the boards for burnt components, corrosion, or cracked solder joints.
• 4. Power reset: Restore power and see if the display and main board communicate normally. If E18 persists, one of the boards may be defective.
• 5. Professional replacement: Control board replacement should be done by a qualified technician to ensure correct programming and safe operation.