ErrorCodeDoctor
Panasonic · Microwave

Panasonic Microwave H90 error code

Difficulty: Hard · Cost: $100–$300 · Duration: 30m

The H90 error means your Panasonic microwave's inverter circuit was shut down by the inverter thermistor because the inverter was overheating. The inverter is the technology that controls the power output to the magnetron. When the thermistor detects dangerously high temperatures it shuts the inverter down to prevent damage. A reset may clear it if it was triggered by temporary overuse, but a recurring H90 requires service centre inspection.

Common causes

  • Inverter overheated due to extended heavy use without adequate cool-down time
  • Inverter thermistor has malfunctioned
  • Inverter circuit component has developed a fault causing excessive heat

How to fix it

  1. 1

    Unplug the microwave and allow it to cool down for at least 30 minutes

  2. 2

    Plug it back in and check if H90 has cleared

  3. 3

    If H90 returns after cooling contact a qualified technician to inspect the inverter and thermistor

Related Panasonic Microwave error codes

1

Cooling

The cooling fan is running to cool down the internal components — not an error

easy
2

Child Lock / Key Symbol / LOCK

Child lock is active — the control panel is disabled

easy
3

D

Demo Mode is active — the microwave will not heat

easy
4

E01

An internal fault was detected — the microwave requires service

hard

H90 error — frequently asked questions

What does the H90 error mean on a Panasonic microwave?

The inverter thermistor detected the inverter is overheating — unit shut down for protection

What causes the H90 error?

The H90 error is usually caused by: Inverter overheated due to extended heavy use without adequate cool-down time; Inverter thermistor has malfunctioned; Inverter circuit component has developed a fault causing excessive heat.

Can I fix the H90 error myself?

This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.

How much does it cost to fix the H90 error?

Fixing the H90 error on a Panasonic microwave typically costs $100–$300, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my microwave with the H90 error?

We'd recommend addressing the H90 error before continuing to use the microwave, since hard-rated issues often involve a real fault rather than a minor glitch.