Daikin Aircon F3 Error Code
Confirm the listed meaning of Daikin F3, 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 F3 mean?
Daikin F3 is listed as high temperature discharge pipe control, malfunction of discharge pipe temperature, and discharge-pipe temperature abnormality 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 |
|---|---|---|
| EZi | High temperature discharge pipe control | 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 discharge pipe temperature | 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 | Discharge-pipe temperature abnormality | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
| F3-01 - master / F3-03 - slave 1 / F3-05 - slave 2 | Discharge temperature too high at R21T or R22T because a stop valve is closed or refrigerant is short | Open the stop valves and check the refrigerant amount. The alternating F3-01 display belongs to the master outdoor unit. |
| F3-20 - master / F3-21 - slave 1 / F3-22 - slave 2 | Compressor-casing temperature too high at R15T because a stop valve is closed or refrigerant is short | Open the stop valves and check the refrigerant amount. The alternating F3-20 display belongs to the master outdoor unit. |
| VRV 5-S R32 - F3 / VRV 5 Heat Recovery R32 - F3 / VRV 5 Heat Pump R32 - F3 | Outdoor discharge-temperature malfunction | Check for a closed outdoor stop valve or insufficient refrigerant charge. |
| ERA-AYF AHU / air curtain | Discharge-pipe or compressor-casing temperature too high (F3-01/20) | Match this meaning to your installed model and the unit that shows the code, then use the checks below. |
- Code
- EZi
- What it means
- High temperature discharge pipe control
- 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 discharge pipe temperature
- 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
- Discharge-pipe 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.
- Code
- F3-01 - master / F3-03 - slave 1 / F3-05 - slave 2
- What it means
- Discharge temperature too high at R21T or R22T because a stop valve is closed or refrigerant is short
- What to check first
- Open the stop valves and check the refrigerant amount. The alternating F3-01 display belongs to the master outdoor unit.
- Code
- F3-20 - master / F3-21 - slave 1 / F3-22 - slave 2
- What it means
- Compressor-casing temperature too high at R15T because a stop valve is closed or refrigerant is short
- What to check first
- Open the stop valves and check the refrigerant amount. The alternating F3-20 display belongs to the master outdoor unit.
- Code
- VRV 5-S R32 - F3 / VRV 5 Heat Recovery R32 - F3 / VRV 5 Heat Pump R32 - F3
- What it means
- Outdoor discharge-temperature malfunction
- What to check first
- Check for a closed outdoor stop valve or insufficient refrigerant charge.
- Code
- ERA-AYF AHU / air curtain
- What it means
- Discharge-pipe or compressor-casing temperature too high (F3-01/20)
- 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 F3 and match the service manual
Record F3 and stop there; the manufacturer gives no customer reset procedure. Arrange diagnosis with the matching service manual.
No manufacturer reset steps listed for F3
Capture the complete F3 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
F3 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 | 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: Defective discharge pipe thermistor; Abnormal discharge pipe temperature; Defective outdoor unit control 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
- 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: Defective discharge pipe thermistor; Abnormal discharge pipe temperature; Defective outdoor unit control 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.
| You can check | Technician should confirm |
|---|---|
| Photograph the complete F3 error code before taking any action. | Confirm F3 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 F3 error code before taking any action.
- Technician should confirm
- Confirm F3 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 F3 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 F3 questions
What does the Daikin F3 error mean?
Can I fix a Daikin F3 error myself?
Is it safe to keep running the aircon with an F3 error?
What causes a Daikin F3 error?
Will a Daikin F3 error need a repair or a full replacement?
What should I send a technician about a Daikin F3 error?
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Use this quote-check guide only after the matching service manual identifies the diagnostic path.