Ad Space — Top Banner

H98

Panasonic Microwave

Severity: Critical

Source: OnlyErrorCodes.com — Every error code. One place.

Panasonic Microwave H98 Error — Thermal Fault

What Does This Error Mean?

Panasonic microwave H98 error means a thermal overtemperature condition or inverter board fault has been detected. Unplug the microwave, allow it to cool fully, then attempt a reset. If H98 returns, the inverter board or a thermal component has failed.

Affected Models

  • Panasonic Countertop Microwave
  • Panasonic Over-the-Range Microwave
  • Panasonic NN Series
  • Panasonic Inverter Microwave

Common Causes

  • Overheating of the inverter board from poor ventilation
  • Failed thermal fuse inside the microwave cabinet
  • Faulty inverter board
  • Blocked or failed cooling fan allowing the inverter to overheat
  • Running the microwave continuously at high power for extended periods

How to Fix It

  1. Unplug the microwave and allow it to cool for 30 minutes.

    H98 from overheating will clear once the thermal protection cools. Do not attempt to restart immediately — give the inverter board and thermal components time to reach room temperature.

  2. Check ventilation clearances.

    Ensure the microwave has at least 3 inches (8 cm) of clearance on all ventilation sides. If it has been running inside a cabinet with the door closed, overheating from restricted airflow is the likely cause of H98.

  3. Check if the microwave was run for an unusually long cycle.

    Running a Panasonic inverter microwave at full power for 10+ minutes continuously can cause the inverter to overheat. Allow it to cool, then test with shorter cooking cycles. If H98 only appears after very long runs, avoid continuous full-power operation.

  4. Call a technician if H98 returns after cooling.

    Persistent H98 after a full cool-down means the thermal fuse has blown, the cooling fan has failed, or the inverter board itself is damaged. Do not attempt these repairs — all are in the high-voltage circuit.

When to Call a Professional

H98 repairs require access to the inverter board and thermal components inside the high-voltage cabinet. These repairs must be performed by a qualified technician — the capacitor holds lethal voltage even when unplugged.

Frequently Asked Questions