E422
Samsung
Outdoor Unit Power Supply Error
E422 displayed; unit may not start or may shut down intermittently.
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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
Incorrect or unstable power to outdoor unit, Loose outdoor terminal block connections, Faulty outdoor PCB power circuit, Blown surge components
How to Fix / Troubleshooting
Safety first: Turn off the outdoor disconnect and main breaker before opening the outdoor unit.
- Step 1 – Verify supply: Ensure the outdoor unit is connected to the correct voltage and phase as per the rating label.
- Step 2 – Inspect terminal block: Check for loose screws, discoloration, or melted insulation at the outdoor power terminals. Tighten and clean as necessary.
- Step 3 – Check for water ingress: Look for signs of moisture or corrosion inside the outdoor control compartment. If present, do not power the unit until it is dried and inspected by a technician.
- Step 4 – Technician tasks: Replacement of surge components, rectifiers, or the entire outdoor PCB should be done by a professional.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Unit PCB
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