Daikin Aircon CA Error Code
Use this Daikin CA error code guide to capture the fault correctly and 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 mixed model-family source rows, 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. The loaded row is source-backed by official 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 matching source row
The same visible code has more than one source-backed meaning. Match the model family, system type, or reporting unit before approving parts.
| Code | What it means | What to check first |
|---|---|---|
| General RA self-diagnosis guide | Malfunction of discharge air thermistor | Match this row to the installed model or reporting unit, then use the source-specific checks below. |
| VRV 5-S R32 - CA / VRV 5 Heat Recovery R32 - CA / VRV 5 Heat Pump R32 - CA | Indoor discharge-air thermistor malfunction | Record the displayed code, unit type, and serial number for qualified diagnosis. |
| EKVDX / VAM R32 ventilation - CA / Sky Air FNA R32 - CA (indoor error overview) / EKEA / EKEXVA AHU control box | Discharge-air thermistor malfunction | Match the EKVDX and paired VAM model, then use the project service manual for diagnosis. |
What to do now
Use these steps before customer action, a sensor check, or PCB quote.
Treat it as a fault signal
If the matching model-family source row applies to CA, do not reset it; record the code and arrange diagnosis. Confirm the matching source row before taking action on another model family.
Match the CA family before taking action
Capture the CA display and model sticker first. For the matching model-family source row, 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 selected family/source row, the controller or unit that reported the code, affected rooms and observed symptoms, and result of the matching manufacturer-listed customer action, if any
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Diagnostic note | Stop the system if it smells burnt, leaks, or trips power; note the exact model and code before booking diagnosis. |
| Diagnostic note | Record the code, unit type, and serial number, then contact a qualified installer for source-matched diagnosis. |
| Diagnostic note | Record the code, reporting unit, and serial number, then contact a qualified installer for source-matched diagnosis. |
| Singapore / model note | Official Daikin SM-TS3 self-diagnosis row. Manual causes: Defective discharge-air thermistor; Defective indoor unit PCB; Defective connector contact. |
| Singapore / model note | 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. |
| Singapore / model note | 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 | Technician should confirm |
|---|---|
| Before taking any action on CA, take a clear display photo. | Match CA to one source-family decoder row before choosing a diagnostic branch. |
| Capture the Daikin model sticker and identify which controller or unit reported the code. | 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. |
| If the matching model-family source row 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. | 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. |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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?
Can I fix a Daikin CA error myself?
Is it safe to keep running the aircon with a CA error?
What causes a Daikin CA error?
Will a Daikin CA error need a repair or a full replacement?
What should I send a technician about a Daikin CA error?
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Use these if the quote mentions the parts, checks, or repair path this code points to.