Daikin Aircon L4 Error Code: What It Means for Your Model

What does Daikin L4 mean?

Daikin L4 is listed as high temperature at inverter circuit heatsink, malfunction of inverter radiation fin temperature rise, and inverter radiation-fin temperature rise abnormality in fault lists for more than one model family, including VRV X RXQ-A(N)R cooling only, VRV 5-S RXYSA R32, VRV 5 Heat Recovery REMA / REYA R32, VRV 5 Heat Pump RYMA / RXYA R32, and Sky Air FNA R32 - test-run diagnostic. 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, and what to check first
Code	What it means	What to check first
EZi	High temperature at inverter circuit heatsink	Match this meaning to your installed model and the unit that shows the code, then use the checks below.
General RA self-diagnosis guide	Malfunction of inverter radiation fin temperature rise	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	Inverter radiation-fin temperature rise abnormality	Match this meaning to your installed model and the unit that shows the code, then use the checks below.
VRV 5-S R32 - L4 / VRV 5 Heat Recovery R32 - L4 / VRV 5 Heat Pump R32 - L4	Inverter-fin temperature abnormality	Record the displayed code, unit type, and serial number for qualified diagnosis.
Sky Air FNA R32 - L4 (test-run diagnostic)	An air inlet or outlet is blocked	Confirm the indoor model is FNA25~60A2VEB(9), record the reporting controller, and follow the matching Daikin service procedure.

Code
EZi
What it means
High temperature at inverter circuit heatsink
What to check first
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
Malfunction of inverter radiation fin temperature rise
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
Inverter radiation-fin temperature rise abnormality
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 5-S R32 - L4 / VRV 5 Heat Recovery R32 - L4 / VRV 5 Heat Pump R32 - L4
What it means
Inverter-fin temperature abnormality
What to check first
Record the displayed code, unit type, and serial number for qualified diagnosis.
Code
Sky Air FNA R32 - L4 (test-run diagnostic)
What it means
An air inlet or outlet is blocked
What to check first
Confirm the indoor model is FNA25~60A2VEB(9), record the reporting controller, and follow the matching Daikin service procedure.

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 L4 and match the service manual
Record L4 and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.
No manufacturer reset steps listed for L4
Capture the complete L4 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
L4 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.

Guidance for your model
Detail	What it says
Singapore / model note	This row is taken from the selected Daikin operation manual's remote-controller fault diagnosis table.
Singapore / model note	Official Daikin SM-TS3 self-diagnosis row. Manual causes: Fin temperature rise due to short circuit; Defective fin thermistor.
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.

Detail
Singapore / model note
What it says
This row is taken from the selected Daikin operation manual's remote-controller fault diagnosis table.
Detail
Singapore / model note
What it says
Official Daikin SM-TS3 self-diagnosis row. Manual causes: Fin temperature rise due to short circuit; Defective fin thermistor.
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.

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.

Homeowner checks and technician confirmations
You can check	Technician should confirm
Photograph the complete L4 error code before taking any action.	Confirm L4 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 L4 error code before taking any action.
Technician should confirm
Confirm L4 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 L4 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 L4 questions

What does the Daikin L4 error mean?

Daikin L4 is listed as high temperature at inverter circuit heatsink, malfunction of inverter radiation fin temperature rise, and inverter radiation-fin temperature rise abnormality in fault lists for more than one model family, including VRV X RXQ-A(N)R cooling only, VRV 5-S RXYSA R32, VRV 5 Heat Recovery REMA / REYA R32, VRV 5 Heat Pump RYMA / RXYA R32, and Sky Air FNA R32 - test-run diagnostic. 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.

Can I fix a Daikin L4 error myself?

No. L4 needs a technician's measurement before parts are decided. Photograph the complete L4 error code before taking any action. Capture the Daikin indoor and outdoor model stickers and identify which controller or unit reported it.

Is it safe to keep running the aircon with an L4 error?

Record L4 and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.

What causes a Daikin L4 error?

Daikin L4 has a listed meaning that depends on the exact model and on which unit shows the code. Use the decoder on this page before assuming a specific cause.

Will a Daikin L4 error need a repair or a full replacement?

Daikin L4 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.

What should I send a technician about a Daikin L4 error?

Before booking, send: L4 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.

Confirm the fault

Share the error code, model number and symptoms so we can assess the likely cause.

Not the right code?

Browse the full Daikin list or check a few codes in the same fault category.