U2
Mitsubishi Electric
Low Voltage / Power Supply Abnormality
Display shows U2; unit will not 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
Supply voltage below specification, loose power cord connection, internal power supply failure on main PCB, damaged surge components
How to Fix / Troubleshooting
Safety: Disconnect from mains before opening the unit.
User checks:
- Outlet: Plug another appliance into the same outlet to confirm proper voltage. Avoid using long extension cords.
- Power cord: Inspect the cord and plug for damage or overheating marks. Replace if damaged.
Technician checks:
- Measure AC input at the terminal block and DC outputs from the main PCB power supply.
- Inspect and replace damaged components on the main control PCB or replace the board entirely if the power supply section has failed.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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