H09
Panasonic
Control Board Communication / Internal PCB Error
Dishwasher shows H09 and will not start or stops unexpectedly
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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 main control PCB, Loose wiring harness connectors, Power surge damage, Software fault
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before accessing control electronics.
- Power reset: Disconnect power for at least 5 minutes to allow the control to fully discharge, then restore power and try a short cycle.
- Inspect control board connections: Remove the inner door panel to access the control module. Check all harness connectors for secure fit and signs of burning or corrosion.
- Check for moisture: Look for signs of water ingress around the control housing. Dry any moisture and identify the source of leaks (door seal, vent, etc.).
- Surge protection: If H09 appeared after a power outage or surge, consider using a surge protector for future protection.
If H09 persists, the main control PCB is likely defective and should be replaced with the correct Panasonic module by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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