E15 error and the unit may not respond to temperature adjustments; buttons may seem locked.

Safety: No internal work is needed initially; only unplug if removing panels.

• Disable child lock: On many Candy models, press and hold the temperature up and down buttons together for 3–5 seconds to toggle the lock. Refer to the user manual for the exact combination.
• Check for stuck buttons: Press each button individually to ensure it moves freely and is not jammed.
• Power reset: Unplug the cooler for 5 minutes, then reconnect and test controls.
• If still locked or E15 persists: Remove the control panel and inspect the "Control panel / keypad PCB" for moisture or damage. Replace the panel if necessary.
• PCB replacement: If a new panel does not resolve the issue, replace the "Main control board (PCB)".