ErrorCodeDoctor
Panasonic · Washing Machine
Panasonic Washing Machine H04 error code
Difficulty: Hard
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Cost: $150–$350
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Duration: Requires professional service
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
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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