Microwave runs briefly then stops heating, display may show H97, fan and light may still operate but food remains cold.

Safety Warning: Microwaves contain a high-voltage system (over 4,000V) that can remain charged even when unplugged. Do not remove the cover or touch internal components unless you are trained and have a proper discharge procedure. For most users, H97 requires a professional technician.

Basic checks you can safely do:

• Power reset: Unplug the microwave for 5–10 minutes, then plug it back in and test. Sometimes a transient inverter fault will clear.
• Ventilation: Ensure all vents are clear and the unit has at least several centimeters of space around it. Overheating can trigger inverter protection.
• Load test: Place a microwave-safe cup of water inside and try to heat for 1–2 minutes. If H97 appears again and water is still cold, the high-voltage system is not operating correctly.

When to call a technician:

• If H97 reappears consistently, the inverter board or magnetron is likely defective. These parts operate at lethal voltages and must be tested and replaced by a qualified Panasonic service technician.
• Do not continue to run the unit repeatedly with H97; this can further damage the inverter or magnetron.