Troubleshooting on Buttons Do Not Respond or Button is Pushed Inside
| Detail Symptom | Self-diagnosis | |
| Question | Answer | |
| Cannot press button | Why some buttons do not change while operating? | ▶Check whether the button is locked. (if is locked, it displays '"CL" or "button is locked") |
| Button is pushed inside | Is the button pushed inside? | ▶If a button pushed inside and cannot take it out, you should request for service hotline 6512 0555 |
| All lights of button are ON | All lights of buttons are turned ON? | ▶Unplug power cord and dry it with drier on the area around button |