ErrorCodeDoctor
Panasonic Washing Machine H04 error code
The H04 error means your Panasonic washing machine detected a short circuit in the power relay on the main PCB. This is an electrical fault on the control board itself. Unless you have advanced electronics skills the only resolution is to replace the main control board. Do not continue using the machine and contact a qualified technician.
Common causes
- Load relay on the main PCB has developed a short circuit
- Power surge caused damage to the relay circuit on the main board
- Main control board has failed
How to fix it
-
1
Unplug the machine immediately and do not attempt to use it
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2
Contact a qualified technician to inspect and replace the main control board
Related Panasonic Washing Machine error codes
H04 error — frequently asked questions
What does the H04 error mean on a Panasonic washing machine?
A short circuit was detected in the load relay on the main control board
What causes the H04 error?
The H04 error is usually caused by: Load relay on the main PCB has developed a short circuit; Power surge caused damage to the relay circuit on the main board; Main control board has failed.
Can I fix the H04 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 H04 error?
Fixing the H04 error on a Panasonic washing machine typically costs $150–$350, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my washing machine with the H04 error?
We'd recommend addressing the H04 error before continuing to use the washing machine, since hard-rated issues often involve a real fault rather than a minor glitch.