ErrorCodeDoctor
Panasonic Microwave U90 error code
U90 is not a fault error. It appears on Panasonic combination steam microwave models after the drain water function has been used 3 consecutive times without interruption. This is a built-in indicator to let you know the drain cycle limit has been reached. Refer to your model's owner's manual for the specific procedure to reset and resume normal operation.
Common causes
- Drain water function was activated and used 3 consecutive times
How to fix it
-
1
Refer to your model's owner's manual for the specific reset procedure after consecutive drain cycles
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
U90 error — frequently asked questions
What does the U90 error mean on a Panasonic microwave?
The drain water function has been used 3 times consecutively
What causes the U90 error?
The U90 error is usually caused by: Drain water function was activated and used 3 consecutive times.
Can I fix the U90 error myself?
Yes — this is rated an easy fix that most people can do themselves, typically in 1–2m.
How much does it cost to fix the U90 error?
Fixing the U90 error on a Panasonic microwave typically costs $0, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my microwave with the U90 error?
In most cases yes, but it's best to address the U90 error soon — see the fix steps below to resolve it.