H12
Panasonic
User Interface / Control Panel Communication Error
Dishwasher shows H12 and may not respond to button presses
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Faulty touch control panel, Loose ribbon cable between UI and main PCB, Moisture in control panel, Damaged UI PCB
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the door panel.
- Inspect control panel: Remove the inner door panel to access the user interface board. Check for signs of moisture, corrosion, or damage on the UI PCB.
- Check ribbon cable: Ensure the flat ribbon cable between the UI and main control board is fully seated at both ends. Reseat it carefully.
- Dry moisture: If condensation or water is present, dry the area thoroughly and inspect the door vent and gasket for leaks that may allow steam into the control area.
- Test buttons: After reassembly, restore power and test all buttons. If some or all remain unresponsive and H12 persists, the UI board is likely faulty.
Replacing the Panasonic control panel / UI PCB is usually straightforward but requires correct part matching by model number.
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Repair Difficulty
Medium
3/5
Required Part
Control Panel / User Interface PCB
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