The Marey heater's temperature setting cannot be adjusted, or the buttons do not respond.

Safety first: Turn off power before removing the front panel.

Steps:

• Check for lock function: Some models have a child lock or panel lock; consult the manual to disable it.
• Inspect keypad: Remove the cover and check the control panel for physical damage or moisture.
• Reseat cable: Reseat the cable between the keypad and main board.
• Replace interface: If buttons remain unresponsive, replace the user interface/control panel.

When to call a technician: If replacing the interface does not restore control or if the main board is suspected.