P1
Daikin
Phase Loss / Phase Reversal (3-Phase Units)
Daikin controller shows P1; unit may not start or may shut down
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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
Missing phase in power supply, Reversed phase sequence, Loose terminal connections, Faulty phase protection relay
How to Fix / Troubleshooting
Safety first: Only a qualified electrician or technician should work on 3-phase power.
Technician steps:
- Measure all three phases at the outdoor unit terminals.
- Correct any phase loss or reversal at the supply.
- Tighten all terminal screws and check the phase protection device.
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Repair Difficulty
Hard
4/5
Required Part
Phase Protection Relay / Power Supply
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