Control panel buttons do not respond or respond intermittently; temperature cannot be adjusted.

Safety: Disconnect power before removing the control panel.

• Clean panel surface: Wipe the control panel with a soft, slightly damp cloth to remove sticky residues that may cause buttons to stick. Do not spray cleaner directly onto the panel.
• Dry moisture: If condensation is visible under the panel, remove it and allow it to dry completely.
• Check cable connections: Reseat the ribbon cable or harness between the user interface and main PCB.
• Replace interface board: If buttons remain unresponsive, replace the user interface PCB with a Teka-compatible part.