Daikin Aircon LC Error Code
Confirm the listed meaning of Daikin LC, note the unit that shows the code and its model, and match the service manual before diagnosis. Match the model first; same-looking codes can point to different rows.
What does Daikin LC mean?
Daikin LC is listed as transmission fault between control PCB and inverter PCB, transmission error between the inverter PCB and outdoor main PCB, and outdoor inverter INV1 transmission trouble at main PCB connectors X20A, X28A, or X40A in fault lists for more than one model family, including VRV X RXQ-A(N)R cooling only, VRV IV+ REYQ / REMQ heat recovery, VRV 5-S RXYSA R32, VRV 5 Heat Recovery REMA / REYA R32, VRV 5 Heat Pump RYMA / RXYA R32, and ERA-AYF AHU / air curtain. This meaning comes from the manufacturer's own diagnostic material. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.
Choose the listing that matches your unit
The same code has more than one listed meaning. Match the model family, the system type and the unit that shows the code before approving parts.
| Code | What it means | What to check first |
|---|---|---|
| General RA self-diagnosis guide | Transmission fault between control PCB and inverter PCB | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| VRV X RXQ-A(N)R cooling only | Transmission error between the inverter PCB and outdoor main PCB | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| LC-14 - master / LC-15 - slave 1 / LC-16 - slave 2 | Outdoor inverter INV1 transmission trouble at main PCB connectors X20A, X28A, or X40A | Check the connection. The alternating LC-14 display belongs to the master outdoor unit. |
| LC-19 - master / LC-20 - slave 1 / LC-21 - slave 2 | Outdoor inverter FAN1 transmission trouble at main PCB connectors X20A, X28A, or X40A | Check the connection. The alternating LC-19 display belongs to the master outdoor unit. |
| LC-24 - master / LC-25 - slave 1 / LC-26 - slave 2 | Outdoor inverter FAN2 transmission trouble at main PCB connectors X20A, X28A, or X40A | Check the connection. The alternating LC-24 display belongs to the master outdoor unit. |
| LC-30 - master / LC-31 - slave 1 / LC-32 - slave 2 | Outdoor inverter INV2 transmission trouble at main PCB connectors X20A, X28A, or X40A | Check the connection. The alternating LC-30 display belongs to the master outdoor unit. |
| LC-33 - master / LC-34 - slave 1 / LC-35 - slave 2 | Transmission trouble between the main PCB and sub PCB at connectors X20A, X2A, or X3A | Check the connection. The alternating LC-33 display belongs to the master outdoor unit. |
| VRV 5-S R32 - LC | Shut-off PCB transmission trouble or disconnection | Check the outdoor-unit to INV1 or FAN1 inverter transmission connection. |
| VRV 5 Heat Recovery R32 - LC / VRV 5 Heat Pump R32 - LC | Outdoor-unit to inverter transmission trouble | Check the outdoor inverter, fan, and main-to-sub PCB transmission connections. |
| ERA-AYF AHU / air curtain | Inverter or outdoor-fan transmission fault (LC-14/19/24) | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
- Code
- General RA self-diagnosis guide
- What it means
- Transmission fault between control PCB and inverter PCB
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
- Code
- VRV X RXQ-A(N)R cooling only
- What it means
- Transmission error between the inverter PCB and outdoor main PCB
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
- Code
- LC-14 - master / LC-15 - slave 1 / LC-16 - slave 2
- What it means
- Outdoor inverter INV1 transmission trouble at main PCB connectors X20A, X28A, or X40A
- What to check first
- Check the connection. The alternating LC-14 display belongs to the master outdoor unit.
- Code
- LC-19 - master / LC-20 - slave 1 / LC-21 - slave 2
- What it means
- Outdoor inverter FAN1 transmission trouble at main PCB connectors X20A, X28A, or X40A
- What to check first
- Check the connection. The alternating LC-19 display belongs to the master outdoor unit.
- Code
- LC-24 - master / LC-25 - slave 1 / LC-26 - slave 2
- What it means
- Outdoor inverter FAN2 transmission trouble at main PCB connectors X20A, X28A, or X40A
- What to check first
- Check the connection. The alternating LC-24 display belongs to the master outdoor unit.
- Code
- LC-30 - master / LC-31 - slave 1 / LC-32 - slave 2
- What it means
- Outdoor inverter INV2 transmission trouble at main PCB connectors X20A, X28A, or X40A
- What to check first
- Check the connection. The alternating LC-30 display belongs to the master outdoor unit.
- Code
- LC-33 - master / LC-34 - slave 1 / LC-35 - slave 2
- What it means
- Transmission trouble between the main PCB and sub PCB at connectors X20A, X2A, or X3A
- What to check first
- Check the connection. The alternating LC-33 display belongs to the master outdoor unit.
- Code
- VRV 5-S R32 - LC
- What it means
- Shut-off PCB transmission trouble or disconnection
- What to check first
- Check the outdoor-unit to INV1 or FAN1 inverter transmission connection.
- Code
- VRV 5 Heat Recovery R32 - LC / VRV 5 Heat Pump R32 - LC
- What it means
- Outdoor-unit to inverter transmission trouble
- What to check first
- Check the outdoor inverter, fan, and main-to-sub PCB transmission connections.
- Code
- ERA-AYF AHU / air curtain
- What it means
- Inverter or outdoor-fan transmission fault (LC-14/19/24)
- What to check first
- Match this meaning to your installed model and the unit that shows the code, then use the checks below.
What to do now
Use these steps to record evidence and match the installed model to its service manual before diagnosis or a repair quote.
Record LC and match the service manual
Record LC and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.
No manufacturer reset steps listed for LC
Capture the complete LC error code and model stickers first. The manufacturer lists the meaning but no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
LC error code, a clear display photo, Daikin indoor and outdoor model stickers, the controller, gateway, or unit that reported the code, operating mode and affected area, and any power or setting changes made after the code appeared
Guidance for your model
Notes that match the code to your exact model. Electrical, refrigerant, wiring, resistance and component checks are for a technician.
| Detail | What it says |
|---|---|
| Singapore / model note | Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective connection between inverter PCB and control PCB; External noise factor; Defective inverter compressor. |
| Singapore / model note | Official Daikin RXQ6-48A(N)R cooling-only service-manual row. Confirm the installed model and matching regional manual before diagnosis; this source is not claimed as universal across every Daikin VRV generation. |
| Singapore / model note | Official Daikin 4PEN561154-1C overview row for REYQ8~20 and REMQ5U7Y1B VRV IV+ heat-recovery systems. The guide refers technicians to the service manual for the complete code list and detailed troubleshooting. |
- Detail
- Singapore / model note
- What it says
- Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective connection between inverter PCB and control PCB; External noise factor; Defective inverter compressor.
- Detail
- Singapore / model note
- What it says
- Official Daikin RXQ6-48A(N)R cooling-only service-manual row. Confirm the installed model and matching regional manual before diagnosis; this source is not claimed as universal across every Daikin VRV generation.
- Detail
- Singapore / model note
- What it says
- Official Daikin 4PEN561154-1C overview row for REYQ8~20 and REMQ5U7Y1B VRV IV+ heat-recovery systems. The guide refers technicians to the service manual for the complete code list and detailed troubleshooting.
What to check before repair
The manufacturer's fault table gives the code's meaning, not a repair procedure. Capture evidence first; model-specific tests belong to the matching service manual.
| You can check | Technician should confirm |
|---|---|
| Photograph the complete LC error code before taking any action. | Confirm LC exactly and record which controller, gateway, or unit reported it. |
| Capture the Daikin indoor and outdoor model stickers and identify which controller or unit reported it. | Match the indoor and outdoor model stickers, installed family, and reporting equipment to the source scope. |
| The manufacturer provides no customer reset procedure. Preserve the evidence and use the matching service manual for any system action. | Follow the matching service-manual procedure and keep measured test evidence before naming a failed part. |
- You can check
- Photograph the complete LC error code before taking any action.
- Technician should confirm
- Confirm LC exactly and record which controller, gateway, or unit reported it.
- You can check
- Capture the Daikin indoor and outdoor model stickers and identify which controller or unit reported it.
- Technician should confirm
- Match the indoor and outdoor model stickers, installed family, and reporting equipment to the source scope.
- You can check
- The manufacturer provides no customer reset procedure. Preserve the evidence and use the matching service manual for any system action.
- Technician should confirm
- Follow the matching service-manual procedure and keep measured test evidence before naming a failed part.
Source-bounded repair decision
Daikin LC confirms the fault label the manufacturer lists, not a failed part or repair procedure. Match the installed model to its service manual and require measured diagnostic evidence before approving parts, settings, or refrigerant work.
Whether the reporting controller or unit and exact installed model are confirmed.
What the matching service-manual procedure and measured tests show.
Whether the proposed repair names the evidence for the failed part or condition.
Daikin LC questions
What does the Daikin LC error mean?
Can I fix a Daikin LC error myself?
Is it safe to keep running the aircon with an LC error?
What causes a Daikin LC error?
Will a Daikin LC error need a repair or a full replacement?
What should I send a technician about a Daikin LC error?
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Read next
Use this quote-check guide only after the matching service manual identifies the diagnostic path.