P1
Luxaire
Inverter DC Bus Overvoltage / Undervoltage (Inverter Models)
Luxaire ductless or packaged AC shows P1; unit may not cool and may shut down shortly after starting.
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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
Power supply issues, Faulty inverter PCB, Loose DC bus connections, Incorrect line voltage
How to Fix / Troubleshooting
Safety: Inverter circuits carry dangerous DC voltages. Do not probe the inverter board unless you are qualified.
- Verify supply voltage: Have a technician confirm that line voltage matches the Luxaire nameplate rating.
- Inspect wiring: With power off, check that all high‑voltage and ground connections to the inverter board are tight and undamaged.
- Surge protection: If P1 occurs after storms or power events, consider adding a whole‑house or dedicated surge protector.
- Board replacement: Persistent P1 usually indicates a failing inverter PCB that must be replaced with the correct Luxaire part.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Control Board
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