ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner L3 error code

Difficulty: Medium · Cost: $0–$400 · Duration: 15–20m

The L3 error means your Daikin air conditioner detected that the temperature inside the outdoor unit electrical component box rose abnormally. This can be caused by short-circuit airflow around the outdoor unit, a defective outdoor unit fan motor, a defective power transistor, or a defective outdoor unit PCB. Make sure the outdoor unit has adequate clearance. If the error persists contact a qualified technician.

Common causes

  • Short-circuit airflow around the outdoor unit reducing cooling of the electrical box
  • Defective outdoor unit fan motor
  • Defective power transistor
  • Defective outdoor unit PCB

How to fix it

  1. 1

    Turn off the air conditioner and allow the outdoor unit to cool

  2. 2

    Check that the outdoor unit has adequate clearance on all sides and remove any objects blocking airflow

  3. 3

    If the error returns contact a qualified technician to inspect the fan motor and electrical components

Related Daikin Air Conditioner error codes

1

A0

An external protection device connected to the indoor unit has been activated

hard
2

A1

A fault was detected in the indoor unit PCB (control board)

hard
3

A3

The drain level control system has detected an abnormality — drain may be clogged

medium
4

A5

Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter

easy

L3 error — frequently asked questions

What does the L3 error mean on a Daikin air conditioner?

The electrical component box temperature rose abnormally

What causes the L3 error?

The L3 error is usually caused by: Short-circuit airflow around the outdoor unit reducing cooling of the electrical box; Defective outdoor unit fan motor; Defective power transistor; Defective outdoor unit PCB.

Can I fix the L3 error myself?

It's possible for a moderately handy person, but budget 15–20m and expect some disassembly.

How much does it cost to fix the L3 error?

Fixing the L3 error on a Daikin air conditioner typically costs $0–$400, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my air conditioner with the L3 error?

In most cases yes, but it's best to address the L3 error soon — see the fix steps below to resolve it.