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Daikin Aircon J6 Error Code

Capture the Daikin J6 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 J6 mean?

Daikin J6 is listed as faulty heat exchanger temperature sensor, malfunction of heat exchanger thermistor, and heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A in fault lists for more than one model family, including 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.

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 J6, do not reset it; record the code and arrange diagnosis. Check your own model's listing before acting on another model family.

  • Match the J6 family before taking action

    Capture the J6 display and model sticker first. For the manufacturer's listing that matches your model family, record the main code, alternating subcode, reporting outdoor-unit role, and model sticker, then arrange qualified VRV 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

    J6 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
    EZi
    What it means
    Faulty heat exchanger temperature sensor
    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 heat exchanger 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
    J6-01 - master / J6-02 - slave 1 / J6-03 - slave 2
    What it means
    Heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A
    What to check first
    Check the connection on the PCB or actuator. The alternating J6-01 display belongs to the master outdoor unit.
  • Code
    J6-08 - master / J6-09 - slave 1 / J6-10 - slave 2
    What it means
    Upper heat-exchanger gas temperature sensor R8T malfunction at main PCB connector X29A
    What to check first
    Check the connection on the PCB or actuator. The alternating J6-08 display belongs to the master outdoor unit.
  • Code
    J6-11 - master / J6-12 - slave 1 / J6-13 - slave 2
    What it means
    Lower heat-exchanger gas temperature sensor R9T malfunction at main PCB connector X29A
    What to check first
    Check the connection on the PCB or actuator. The alternating J6-11 display belongs to the master outdoor unit.
  • Code
    VRV 5-S R32 - J6
    What it means
    Outdoor de-icing temperature sensor malfunction
    What to check first
    Check the R4T coil liquid-temperature sensor connection at A1P connector X30A.
  • Code
    VRV 5 Heat Recovery R32 - J6 / VRV 5 Heat Pump R32 - J6
    What it means
    Outdoor de-icing or gas heat-exchanger temperature sensor malfunction
    What to check first
    Check the outdoor de-icer and gas heat-exchanger sensor connections at the main PCB.
  • Code
    ERA-AYF AHU / air curtain
    What it means
    Outdoor heat-exchanger deicer temperature-sensor malfunction (J6-01)
    What to check first
    Match this meaning to your installed model and the unit that shows the code, then use the checks below.

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
    Check the connection on the PCB or actuator. This overview row is for qualified VRV diagnosis; do not open panels, alter field wiring, handle refrigerant, or change commissioning settings.
  • Detail
    Diagnostic note
    What it says
    Check the R4T coil liquid-temperature sensor connection at A1P connector X30A.
  • 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 thermistor connection; Defective heat exchanger thermistor; Defective outdoor unit PCB.
  • Detail
    Singapore / model note
    What it says
    Official Daikin 4PEN561154-1C overview row for REYQ8~20 and REMQ5U7Y1B VRV IV+ heat-recovery systems. The guide refers technicians to the service manual for the complete code list and detailed troubleshooting.

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 J6, take a clear display photo.
    Technician should confirm
    Match J6 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
    EZi: use the matching service procedure to test only the components and conditions named by faulty heat exchanger temperature sensor; require measured evidence before quoting parts.
  • You can check
    If the manufacturer's listing for your model family applies to your unit, record the main code, alternating subcode, reporting outdoor-unit role, and model sticker, then arrange qualified VRV diagnosis. Confirm the exact model family before taking a different customer action.
    Technician should confirm
    General RA self-diagnosis guide: use the matching service procedure to test only the components and conditions named by malfunction of heat exchanger thermistor; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV IV+ REYQ / REMQ heat recovery: use the matching service procedure to test only the components and conditions named by heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV IV+ REYQ / REMQ heat recovery: use the matching service procedure to test only the components and conditions named by upper heat-exchanger gas temperature sensor R8T malfunction at main PCB connector X29A; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV IV+ REYQ / REMQ heat recovery: use the matching service procedure to test only the components and conditions named by lower heat-exchanger gas temperature sensor R9T malfunction at main PCB connector X29A; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    VRV 5-S RXYSA R32: use the matching service procedure to test only the components and conditions named by outdoor de-icing temperature sensor 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 outdoor de-icing or gas heat-exchanger temperature sensor 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 outdoor de-icing or gas heat-exchanger temperature sensor malfunction; require measured evidence before quoting parts.
  • You can check
    Technician should confirm
    ERA-AYF AHU / air curtain: use the matching service procedure to test only the components and conditions named by outdoor heat-exchanger deicer temperature-sensor malfunction (J6-01); 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

EZi: diagnose faulty heat exchanger temperature sensor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. General RA self-diagnosis guide: diagnose malfunction of heat exchanger thermistor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose upper heat-exchanger gas temperature sensor R8T malfunction at main PCB connector X29A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose lower heat-exchanger gas temperature sensor R9T malfunction at main PCB connector X29A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5-S RXYSA R32: diagnose outdoor de-icing temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5 Heat Recovery REMA / REYA R32: diagnose outdoor de-icing or gas heat-exchanger temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5 Heat Pump RYMA / RXYA R32: diagnose outdoor de-icing or gas heat-exchanger temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. ERA-AYF AHU / air curtain: diagnose outdoor heat-exchanger deicer temperature-sensor malfunction (J6-01) on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6.

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

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

  • 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 IV+ REYQ / REMQ heat recovery: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • VRV IV+ REYQ / REMQ heat recovery: the quote must name the test result that proves this row's fault rather than borrowing a parts list from the other family.

  • VRV IV+ REYQ / REMQ heat recovery: 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.

  • ERA-AYF AHU / air curtain: 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 J6 questions

What does the Daikin J6 error mean?
Daikin J6 is listed as faulty heat exchanger temperature sensor, malfunction of heat exchanger thermistor, and heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A in fault lists for more than one model family, including 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.
Can I fix a Daikin J6 error myself?
No. J6 needs a technician's measurement before parts are decided. Before taking any action on J6, 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 J6 error?
If the manufacturer's listing for your model family applies to J6, 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 J6 error?
Daikin J6 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 J6 error need a repair or a full replacement?
EZi: diagnose faulty heat exchanger temperature sensor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. General RA self-diagnosis guide: diagnose malfunction of heat exchanger thermistor on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose heat-exchanger deicer temperature sensor R11T malfunction at sub PCB connector X15A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose upper heat-exchanger gas temperature sensor R8T malfunction at main PCB connector X29A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV IV+ REYQ / REMQ heat recovery: diagnose lower heat-exchanger gas temperature sensor R9T malfunction at main PCB connector X29A on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5-S RXYSA R32: diagnose outdoor de-icing temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5 Heat Recovery REMA / REYA R32: diagnose outdoor de-icing or gas heat-exchanger temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. VRV 5 Heat Pump RYMA / RXYA R32: diagnose outdoor de-icing or gas heat-exchanger temperature sensor malfunction on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6. ERA-AYF AHU / air curtain: diagnose outdoor heat-exchanger deicer temperature-sensor malfunction (J6-01) on the matching Daikin system. Approve repair or replacement parts only after that branch has measured evidence for J6.
What should I send a technician about a Daikin J6 error?
Before booking, send: J6 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.