Daikin aircon AA error code
Use this Daikin AA error code guide to capture the fault correctly and see what should be checked before parts are quoted.
What does Daikin AA mean?
Daikin AA is listed as heater overheat in Ceiling Cassette, Ceiling Suspended, Inverter Split rows such as SM-TS3 matrix overview. The loaded row is source-backed by official diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.
Voltage, current, fuse, module, or power-supply protection has been triggered.
Loose connector, damaged harness, or outdoor electrical component fault.
PCB or inverter-module issue after power and load checks are confirmed.
What to do now
Use these steps before customer action or a parts quote.
Stop using the unit if AA returns
Stop repeated restarts if AA returns, trips power, smells burnt, or the outdoor unit runs unusually hot.
No manufacturer reset steps listed for AA
Capture the complete AA display and model stickers first. The selected source row lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
AA error code, a clear display photo, Daikin model stickers, affected rooms, operating state when the code appeared, and trip timing and outdoor-unit behaviour
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. |
| Singapore / model note | Official Daikin SM-TS3 page-1 matrix row. The matrix gives the broad malfunction wording, but not the detailed cause table; confirm the exact model and installed accessories before treating it as final. |
What to check before repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You can check | Technician should confirm |
|---|---|
| Before taking any system action on AA, take a clear display photo. | Confirm whether AA is voltage, current, module, fuse, or protection related. |
| Capture the Daikin indoor and outdoor model stickers so the correct family row is used. | Check incoming voltage, connectors, inverter module, and current draw under load. |
| The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | Confirm downstream loads before replacing electrical boards or modules. |
What changes the next step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows AA. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same AA fault. | Prioritise the shared outdoor side, power path, and source-listed system branch. |
| The fault remains displayed or returns during operation. | Start with the source-row diagnostic branch before approving parts. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to Ceiling Cassette, Ceiling Suspended, Inverter Split rows such as SM-TS3 matrix overview. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Electrical module or wiring decision
Daikin AA needs voltage, current, module, and load checks before parts are quoted. The repair path depends on whether the fault is supply-side, wiring-side, or board-side.
Supply voltage and load checks separate building-side issues from unit-side faults.
Module or inverter faults need measured current and voltage evidence.
Repeated electrical trips should not be cleared repeatedly without diagnosis.
Daikin AA questions
What does the Daikin AA error mean?
Can I fix a Daikin AA error myself?
Is it safe to keep running the aircon with an AA error?
What causes a Daikin AA error?
Will a Daikin AA error need a repair or a full replacement?
What should I send a technician about a Daikin AA error?
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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Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.