Daikin Aircon P3 Error Code: What It Means for Your Model

What does Daikin P3 mean?

Daikin P3 is listed as malfunction of thermistor in switch box and reactor temperature abnormality in fault lists for more than one model family, including VRV X RXQ-A(N)R cooling only. 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
General RA self-diagnosis guide	Malfunction of thermistor in switch box	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	Reactor temperature abnormality	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 thermistor in switch box
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
Reactor temperature abnormality
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 P3 and match the service manual
Record P3 and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.
No manufacturer reset steps listed for P3
Capture the complete P3 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
P3 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	Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective thermistor connection; Defective reactor thermistor; Defective inverter PCB.
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
Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective thermistor connection; Defective reactor thermistor; Defective inverter PCB.
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 P3 error code before taking any action.	Confirm P3 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 P3 error code before taking any action.
Technician should confirm
Confirm P3 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 P3 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 P3 questions

What does the Daikin P3 error mean?

Daikin P3 is listed as malfunction of thermistor in switch box and reactor temperature abnormality in fault lists for more than one model family, including VRV X RXQ-A(N)R cooling only. 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 P3 error myself?

No. P3 needs a technician's measurement before parts are decided. Photograph the complete P3 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 a P3 error?

Record P3 and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.

What causes a Daikin P3 error?

Daikin P3 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 P3 error need a repair or a full replacement?

Daikin P3 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 P3 error?

Before booking, send: P3 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.