Daikin aircon F4 error code
Use this Daikin F4 error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted.
What does Daikin F4 mean?
Daikin F4 is listed as wet alarm 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 another reset or parts quote.
Stop using the unit if F4 returns
Stop repeated restarts if F4 returns, trips power, smells burnt, or the outdoor unit runs unusually hot.
Reset F4 once
Capture the F4 display, then reset once only if there is no burning smell, repeated trip, or hot outdoor unit.
Send these to us
F4 error code, a clear display photo, Daikin model stickers, affected rooms, reset result, 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 |
|---|---|
| Source repair action | 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 resetting F4, take a clear display photo. | Confirm whether F4 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. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | 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 F4. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same F4 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| The fault returns immediately after one reset. | 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 F4 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 F4 questions
What does the Daikin F4 error mean?
Can I fix a Daikin F4 error myself?
Is it safe to keep running the aircon with a F4 error?
What causes a Daikin F4 error?
Will a Daikin F4 error need a repair or a full replacement?
What should I send a technician about a Daikin F4 error?
Confirm the fault
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Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.