If the panel is unresponsive, you likely activated "Child Lock." Hold the Alarm button for 3 seconds to disable it.
Leave at least 2.5 cm of space around the unit for heat dissipation. panasonic nr-f503gt manual
If the display flashes "H" and a number, the manual indicates a sensor failure. If the panel is unresponsive, you likely activated
You have set the drawer to "Meat/Fish" mode. Move the slider inside the drawer to "Vegetables" (which raises the humidity and temperature slightly). If the panel is unresponsive
panasonic 6 door fridge nr-f503gt-ts 493l, 3 ticks, inverter
For detailed diagrams and the complete list of error codes, you can download the full PDF Operating Instructions from the official Panasonic support archives. NR-F503GT-T7 6-Door Made in Japan Refrigerator - Panasonic