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Daikin Aircon E9 Error Code

Use this Daikin E9 error code guide to confirm the source table meaning, capture the reporting equipment and model, and match the service manual before diagnosis. Match the model first; same-looking codes can point to different rows.

What does Daikin E9 mean?

Daikin E9 is listed as malfunction of electronic expansion valve coil, electronic expansion valve coil abnormality, and upper heat-exchanger electronic expansion-valve malfunction at Y1E on main PCB connector X21A in mixed model-family source rows, 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. 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
    SkyAir
    What it means
    Malfunction of electronic expansion valve coil
    What to check first
    Match this row to the installed model or reporting unit, then use the source-specific checks below.
  • Code
    VRV X RXQ-A(N)R cooling only
    What it means
    Electronic expansion valve coil abnormality
    What to check first
    Match this row to the installed model or reporting unit, then use the source-specific checks below.
  • Code
    E9-01 - master / E9-05 - slave 1 / E9-08 - slave 2
    What it means
    Upper heat-exchanger electronic expansion-valve malfunction at Y1E on main PCB connector X21A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-01 display to the master source row.
  • Code
    E9-04 - master / E9-07 - slave 1 / E9-10 - slave 2
    What it means
    Lower heat-exchanger electronic expansion-valve malfunction at Y3E on main PCB connector X23A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-04 display to the master source row.
  • Code
    E9-03 - master / E9-06 - slave 1 / E9-09 - slave 2
    What it means
    Subcool heat-exchanger electronic expansion-valve malfunction at Y2E on main PCB connector X22A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-03 display to the master source row.
  • Code
    E9-26 - master / E9-27 - slave 1 / E9-28 - slave 2
    What it means
    Receiver-gas electronic expansion-valve malfunction at Y4E on main PCB connector X25A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-26 display to the master source row.
  • Code
    E9-29 - master / E9-34 - slave 1 / E9-39 - slave 2
    What it means
    Inverter-cooling electronic expansion-valve malfunction at Y5E on sub PCB connector X8A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-29 display to the master source row.
  • Code
    E9-31 - master / E9-36 - slave 1 / E9-41 - slave 2
    What it means
    Auto-charge electronic expansion-valve malfunction at Y6E on sub PCB connector X10A
    What to check first
    Check the connection on the PCB or actuator. Match the alternating E9-31 display to the master source row.
  • Code
    VRV 5-S R32 - E9 / VRV 5 Heat Recovery R32 - E9 / VRV 5 Heat Pump R32 - E9
    What it means
    Outdoor electronic expansion-valve malfunction
    What to check first
    Check the Y1E or Y3E expansion-valve connection at the outdoor PCB or actuator.
  • Code
    ERA-AYF AHU / air curtain
    What it means
    Electronic expansion-valve malfunction (E9-01/04/26/29)
    What to check first
    Match this row to the installed model or reporting unit, then use the source-specific 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 E9 and match the service manual

    Record E9 and stop there; the source table gives no customer reset procedure. Arrange diagnosis with the matching service manual.

  • No manufacturer reset steps listed for E9

    Capture the complete E9 error code and model stickers first. The source table lists the meaning but no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.

  • Send these to us

    E9 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

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
    Singapore / model note
    What it says
    Official Daikin SM-TS3 self-diagnosis row. Manual causes: Electronic expansion valve connector disconnected; Defective electronic expansion valve coil; Defective outdoor unit control PCB.
  • Source 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.
  • Source 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

The source table establishes the code meaning, not a repair procedure. Capture evidence first; model-specific tests belong to the matching service manual.

  • You can check
    Photograph the complete E9 error code before taking any action.
    Technician should confirm
    Confirm E9 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 source table 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 E9 confirms the source-table fault label, 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 E9 questions

What does the Daikin E9 error mean?
Daikin E9 is listed as malfunction of electronic expansion valve coil, electronic expansion valve coil abnormality, and upper heat-exchanger electronic expansion-valve malfunction at Y1E on main PCB connector X21A in mixed model-family source rows, 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. 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.
Can I fix a Daikin E9 error myself?
No. E9 needs a technician's measurement before parts are decided. Photograph the complete E9 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 an E9 error?
Record E9 and stop there; the source table gives no customer reset procedure. Arrange diagnosis with the matching service manual.
What causes a Daikin E9 error?
Daikin E9 has source-backed wording that depends on the exact model, source row, or reporting unit. Use the decoder on this page before assuming a specific cause.
Will a Daikin E9 error need a repair or a full replacement?
Daikin E9 confirms the source-table fault label, 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 E9 error?
Before booking, send: E9 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.

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Use this quote-check guide only after the matching service manual identifies the diagnostic path.