H31 error, freezer interior light and display may flicker, unit may not cool

Safety: Disconnect power before removing trims or panels around the door frame.

Steps:

• 1. Observe light behavior: Open and close the door. If the interior LED does not respond correctly, the door switch circuit is suspect.
• 2. Locate door sensor: On many Panasonic freezers, a magnetic reed switch is hidden in the cabinet frame, with a magnet in the door gasket area.
• 3. Check magnet alignment: Inspect the door gasket and frame for damage or warping that might move the magnet away from the switch. Adjust door hinges if the door is sagging.
• 4. Test switch (if accessible): If the reed switch is accessible, disconnect it and test continuity while placing a magnet near it. It should open and close reliably.
• 5. Wiring inspection: Check the harness from the switch to the control PCB for pinched or broken wires, especially near the hinge area.
• 6. Replace faulty parts: Install a new Panasonic door switch or magnet as required. If the switch and wiring are good, the main PCB input may be defective.