Refrigerator shows H51, compressor runs but cooling is poor or uneven

Warning: Refrigerant system work requires certified equipment and must be performed by a licensed technician. Do not attempt to open the sealed system yourself.

• Step 1 – Basic checks: Ensure doors close properly, gaskets seal, and ventilation around the unit is adequate. Clean condenser coils and verify condenser fan operation.
• Step 2 – Temperature verification: Place thermometers in both compartments to confirm actual temperatures versus setpoints.
• Step 3 – Look for frost pattern: With rear interior panel removed (technician-level), a normal evaporator should frost evenly. Frost only at the inlet or no frost suggests a sealed system issue.
• Step 4 – Call a professional: If H51 persists after airflow and door seal issues are ruled out, contact an authorized Panasonic service center for leak detection, evacuation, and recharge or compressor replacement.