H90
Panasonic
Inverter Startup / Communication Error
Microwave does not heat and displays H90, sometimes immediately after pressing start.
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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
Loose wiring between control PCB and inverter, Defective inverter board, Faulty control PCB
How to Fix / Troubleshooting
Safety Warning: Internal wiring and boards are not user-serviceable due to high voltage.
Safe troubleshooting:
- Power reset: Unplug the unit for 10 minutes to reset the control and inverter.
- Check power source: Ensure the outlet is properly grounded and not shared with heavy appliances that may cause voltage drops.
- Try a different outlet: If possible, test the microwave on a separate circuit to rule out supply issues.
Service recommendation:
- If H90 reappears, an internal board or harness is likely faulty.
- Contact a Panasonic service center; mention the H90 code and your model number.
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Repair Difficulty
Professional Required
5/5
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