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Daikin Aircon CA Error Code

Capture the Daikin CA fault correctly, then see what should be checked before parts are quoted. Match the model first; same-looking codes can point to different rows.

What does Daikin CA mean?

Daikin CA is listed as malfunction of discharge air thermistor, indoor discharge-air thermistor malfunction, and discharge-air thermistor malfunction in fault lists for more than one model family, including VRV 5-S RXYSA R32, VRV 5 Heat Recovery REMA / REYA R32, VRV 5 Heat Pump RYMA / RXYA R32, EKVDX / VAM R32 ventilation, Sky Air FNA R32 - indoor error overview, and EKEA / EKEXVA AHU control box. 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.

What to do now

Use these steps before customer action, a sensor check, or PCB quote.

  • Treat it as a fault signal

    If the manufacturer's listing for your model family applies to CA, do not reset it; record the code and arrange diagnosis. Check your own model's listing before acting on another model family.

  • Match the CA family before taking action

    Capture the CA display and model sticker first. For the manufacturer's listing that matches your model family, record the complete code, unit type, serial number, and model sticker, then arrange qualified Daikin diagnosis. The same code can mean something different in another model family, so confirm the model before taking another action. Do not treat a generic power-cycle as a manufacturer reset procedure.

  • Send these to us

    CA error code, a clear display photo, Daikin indoor and outdoor model stickers, the model family it matches, the controller or unit that reported the code, affected rooms and observed symptoms, and result of the matching manufacturer-listed customer action, if any

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
    General RA self-diagnosis guide
    What it means
    Malfunction of discharge air thermistor
    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 - CA / VRV 5 Heat Recovery R32 - CA / VRV 5 Heat Pump R32 - CA
    What it means
    Indoor discharge-air thermistor malfunction
    What to check first
    Record the displayed code, unit type, and serial number for qualified diagnosis.
  • Code
    EKVDX / VAM R32 ventilation - CA / Sky Air FNA R32 - CA (indoor error overview) / EKEA / EKEXVA AHU control box
    What it means
    Discharge-air thermistor malfunction
    What to check first
    Match the EKVDX and paired VAM model, then use the project service manual for diagnosis.

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
    Diagnostic note
    What it says
    Stop the system if it smells burnt, leaks, or trips power; note the exact model and code before booking diagnosis.
  • Detail
    Diagnostic note
    What it says
    Record the code, unit type, and serial number, then contact a qualified installer for source-matched diagnosis.
  • Detail
    Diagnostic note
    What it says
    Record the code, which unit shows it, and the serial number, then contact a qualified installer for source-matched diagnosis.
  • Detail
    Singapore / model note
    What it says
    Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective discharge-air thermistor; Defective indoor unit PCB; Defective connector contact.
  • Detail
    Singapore / model note
    What it says
    Official Daikin 4P600330-1F row for the RXYSA4~6A7V/Y1B VRV 5-S R32 family. Confirm the exact model and displayed punctuation before using this interpretation.
  • Detail
    Singapore / model note
    What it says
    Official Daikin 4P687640-1D row for the REMA5A7Y1B and REYA8~20A7Y1B VRV 5 Heat Recovery R32 family. Confirm the exact model and displayed punctuation before using this interpretation.

What to check before repair

Choose the matching source-family row first, then use only that row's diagnostic branch and customer-action boundary.

  • You can check
    Before taking any action on CA, take a clear display photo.
    Technician should confirm
    Match CA to one source-family decoder row before choosing a diagnostic branch.
  • You can check
    Capture the Daikin model sticker and identify which controller or unit reported the code.
    Technician should confirm
    General RA self-diagnosis guide: use the matching service procedure to test only the components and conditions named by malfunction of discharge air thermistor; require measured evidence before quoting parts.
  • You can check
    If the manufacturer's listing for your model family applies to your unit, record the complete code, unit type, serial number, and model sticker, then arrange qualified Daikin diagnosis. Confirm the exact model family before taking a different customer action.
    Technician should confirm
    VRV 5-S RXYSA R32: use the matching service procedure to test only the components and conditions named by indoor discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV 5 Heat Recovery REMA / REYA R32: use the matching service procedure to test only the components and conditions named by indoor discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV 5 Heat Pump RYMA / RXYA R32: use the matching service procedure to test only the components and conditions named by indoor discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    EKVDX / VAM R32 ventilation: use the matching service procedure to test only the components and conditions named by discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    Sky Air FNA R32 - indoor error overview: use the matching service procedure to test only the components and conditions named by discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    EKEA / EKEXVA AHU control box: use the matching service procedure to test only the components and conditions named by discharge-air thermistor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    Do not transfer a sensor, drain, valve, fan, compressor, electrical, or reset procedure from one family row to the other.

Family-specific repair decision

General RA self-diagnosis guide: diagnose malfunction of discharge air thermistor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5-S RXYSA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5 Heat Recovery REMA / REYA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5 Heat Pump RYMA / RXYA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. EKVDX / VAM R32 ventilation: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. Sky Air FNA R32 - indoor error overview: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. EKEA / EKEXVA AHU control box: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA.

  • The model sticker and reporting equipment must match one decoder row before diagnosis begins.

  • General RA self-diagnosis guide: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • VRV 5-S RXYSA R32: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • VRV 5 Heat Recovery REMA / REYA R32: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • VRV 5 Heat Pump RYMA / RXYA R32: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • EKVDX / VAM R32 ventilation: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • Sky Air FNA R32 - indoor error overview: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • EKEA / EKEXVA AHU control box: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • Compare repair cost, system age, parts availability, and overall condition only after the family-specific fault is proven.

Daikin CA questions

What does the Daikin CA error mean?
Daikin CA is listed as malfunction of discharge air thermistor, indoor discharge-air thermistor malfunction, and discharge-air thermistor malfunction in fault lists for more than one model family, including VRV 5-S RXYSA R32, VRV 5 Heat Recovery REMA / REYA R32, VRV 5 Heat Pump RYMA / RXYA R32, EKVDX / VAM R32 ventilation, Sky Air FNA R32 - indoor error overview, and EKEA / EKEXVA AHU control box. 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 CA error myself?
No. CA needs a technician's measurement before parts are decided. Before taking any action on CA, take a clear display photo. Capture the Daikin model sticker and identify which controller or unit reported the code.
Is it safe to keep running the aircon with a CA error?
If the manufacturer's listing for your model family applies to CA, do not reset it; record the code and arrange diagnosis. Check your own model's listing before acting on another model family.
What causes a Daikin CA error?
Daikin CA 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 CA error need a repair or a full replacement?
General RA self-diagnosis guide: diagnose malfunction of discharge air thermistor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5-S RXYSA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5 Heat Recovery REMA / REYA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. VRV 5 Heat Pump RYMA / RXYA R32: diagnose indoor discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. EKVDX / VAM R32 ventilation: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. Sky Air FNA R32 - indoor error overview: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA. EKEA / EKEXVA AHU control box: diagnose discharge-air thermistor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for CA.
What should I send a technician about a Daikin CA error?
Before booking, send: CA error code, a clear display photo, Daikin indoor and outdoor model stickers, the model family it matches, the controller or unit that reported the code, affected rooms and observed symptoms, and result of the matching manufacturer-listed customer action, if any.

Where to go next

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.

Read next

Use these if the quote mentions the parts, checks, or repair path this code points to.