What It Means
Indicates the inverter control PCB itself has detected an internal fault — commonly a blown fuse, a failed power module, or a wiring problem on the compressor or fan output side — and has shut down the inverter drive.
Daikin Chiller
Daikin Chiller Error Code L1
Troubleshooting guide for the Daikin Chiller system fault L1.
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Possible Causes
- Blown fuse on the inverter PCB.
- Failed power module (IGBT/IPM) on the board.
- Damaged or shorted compressor output wiring.
- Damaged or shorted outdoor fan motor wiring.
- Loose or corroded connector at the inverter PCB.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Indicates the inverter control PCB itself has detected an internal fault — commonly a blown fuse, a failed power module, or a wiring problem on the compressor or fan output side — and has shut down the inverter drive. This differs from L0, which reports a broader inverter system fault tied to insufficient power supply capacity, and from LC, which is specifically a lost communication link between the inverter PCB and the main control PCB rather than a fault on the inverter board itself. Because L1 can be triggered by downstream wiring as well as the board, verify compressor and fan output wiring before replacing the inverter PCB.
All Recorded Causes
Blown fuse on the inverter PCB. Failed power module (IGBT/IPM) on the board. Damaged or shorted compressor output wiring. Damaged or shorted outdoor fan motor wiring. Loose or corroded connector at the inverter PCB. Moisture intrusion into the electrical component box.
Verify Before Replacing Parts
- Confirm the exact Daikin model family and chiller context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Daikin fault points at blown fuse on the inverter PCB.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out failed power module (IGBT/IPM) on the board.
- After the correction, run the system long enough to confirm the chiller fault does not return under normal load.
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