What It Means
Malfunction of inverter radiation fin temperature rise.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code L4
Troubleshooting guide for the Daikin Split & Multi-Split system fault L4.
Possible Causes
- Fin temperature rise due to short circuit.
- Defective fin thermistor.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Malfunction of inverter radiation fin temperature rise
All Recorded Causes
Fin temperature rise due to short circuit Defective fin thermistor
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Daikin fault points at fin temperature rise due to short circuit.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out defective fin thermistor.
- After the correction, run the system long enough to confirm the split/ multi split fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Split & Multi-Split diagnostics step-by-step — so you confirm the cause before swapping parts.
