ErrorCodeDoctor
Panasonic Microwave H39 error code
The H39 error means your Panasonic combination steam microwave detected a fault with the steam heater thermistor — the temperature sensor that monitors the steam heater to prevent overheating. When this sensor fails the steam function cannot operate safely. This requires inspection and repair by an authorised service centre.
Common causes
- Steam heater thermistor has malfunctioned or failed
- Wiring to the steam heater thermistor is loose or damaged
How to fix it
-
1
Stop using the microwave and unplug it
-
2
Contact a qualified technician to inspect and replace the steam heater thermistor
Related Panasonic Microwave error codes
Cooling
The cooling fan is running to cool down the internal components — not an error
Child Lock / Key Symbol / LOCK
Child lock is active — the control panel is disabled
D
Demo Mode is active — the microwave will not heat
E01
An internal fault was detected — the microwave requires service
H39 error — frequently asked questions
What does the H39 error mean on a Panasonic microwave?
The steam heater thermistor detected a fault
What causes the H39 error?
The H39 error is usually caused by: Steam heater thermistor has malfunctioned or failed; Wiring to the steam heater thermistor is loose or damaged.
Can I fix the H39 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 H39 error?
Fixing the H39 error on a Panasonic microwave typically costs $80–$250, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my microwave with the H39 error?
We'd recommend addressing the H39 error before continuing to use the microwave, since hard-rated issues often involve a real fault rather than a minor glitch.