Daikin Air Conditioner Error L4

⚡ Quick Answer: The Daikin Air Conditioner L4 error indicates a communication failure between the indoor and outdoor units, typically due to overheating at the invert... ✅ DIY Fixable

What Does Error L4 Mean?

The Daikin Air Conditioner L4 error indicates a communication failure between the indoor and outdoor units, typically due to overheating at the inverter circuit heatsink in the outdoor unit. This can cause the outdoor unit to shut down, leading to a loss of cooling performance and a flashing L4 code on the remote or controller. Symptoms may include an outdoor fan running abnormally or not at all, necessitating prompt attention to restore proper operation.

Common Symptoms:

  • Outdoor unit shuts down or stops operation
  • Cooling performance stops with L4 shown on remote or controller
  • Outdoor fan may be running abnormally or not at all

Possible Causes

  • Overheating at inverter heatsink due to high temperature (high)
  • Faulty fin thermistor or its connector causing incorrect temperature detection (medium)
  • Outdoor fan motor malfunction leading to insufficient cooling of heatsink (medium)

How to Fix Error L4

DIY Fix Initial checks and safe reset attempt

  1. Ensure outdoor unit is not blocked by debris or objects restricting airflow
  2. Turn off air conditioner using remote or breaker, wait 3–5 minutes, and restart to clear transient faults

Technician Only Professional diagnosis and repair

  1. Inspect outdoor heatsink and inverter area for overheating and proper cooling
  2. Test fin thermistor and connectors for correct operation and secure connections
  3. Check outdoor fan motor function and replace if faulty
  4. Inspect inverter PCB for damage or overheating signs

Parts needed: Fin thermistor, Fan motor, Inverter PCB, Connectors

🛑 When to Call a Pro:
  • If the error persists after a safe reset
  • If outdoor fan is not operating
  • If overheating continues leading to frequent shutdowns

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number DAIKIN PCB123456
voltage_rating 220V AC

Common Questions

What does L4 error mean on Daikin Air Conditioner?

L4 error indicates a communication failure due to overheating at the inverter circuit heatsink.

Can I fix Daikin Air Conditioner L4 error myself?

Yes, check for airflow blockages, reset the unit by turning it off and back on after 3-5 minutes.

How much does it cost to fix L4 error?

Repair costs range from ¥15,000 to ¥80,000+, depending on the components needed.

When should I call a technician for L4?

Call a technician if the error persists after a reset, if the outdoor fan is non-operational, or if overheating continues.

Sources & References

Data last verified: 2026-07-01

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