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Daikin Mini-Split Error Codes: Complete U, E, F, L, A Code Guide

Quick Answer

Daikin mini-splits use a letter-number error code system where the letter prefix indicates the fault category: U codes (U0, U2, U3, U4, U9) cover communication faults and voltage issues between indoor and outdoor units over the 2-wire S1-S2 bus. E codes (E0, E3, E4, E5, E6, E7, E11) cover compressor protection, pressure limits, and motor faults.

Daikin mini-splits use a letter-number error code system where the letter prefix indicates the fault category: U codes (U0, U2, U3, U4, U9) cover communication faults and voltage issues between indoor and outdoor units over the 2-wire S1-S2 bus. E codes (E0, E3, E4, E5, E6, E7, E11) cover compressor protection, pressure limits, and motor faults. F codes (F3) cover temperature sensor readings. L codes (L1, L5) cover inverter board and overcurrent protection. A codes (A3) cover drain and condensate issues. Enter diagnostic mode by holding MODE + FAN on the remote for 5 seconds to read error history with timestamps.

DaikinMinisplit

About These Daikin Minisplit Error Codes

Daikin error codes use letter prefixes: U = communication/voltage, E = compressor/pressure, F = temperature, L = inverter/overcurrent, A = drain/airflow.

Most Common Error Codes

Communication wire issues (U codes)40%
Low refrigerant or compressor faults (E codes)24%
Outdoor fan motor failure (E7)14%
Voltage supply problems (U2, U9)12%
Drain line clog (A3)10%

Symptoms You May Notice

  • Error code displayed on indoor unit
  • System stops heating or cooling
  • Blinking LED pattern on indoor unit
  • Outdoor unit not running
  • Reduced performance before error appears

Tools Required for Diagnosis

MultimeterFlashlightScrewdriver set

How to Identify Your Error Code

1

Read the error code on the indoor unit display or LED blink pattern

Read the error code on the indoor unit display or LED blink pattern. Write down the exact code including any letters and numbers.

2

Enter diagnostic mode by holding MODE + FAN on the remote for 5

3

Based on the code prefix, determine the fault category: U =

Frequently Asked Questions

Where do I find the error code on my Daikin?
On models with an LCD display, the code appears directly on the indoor unit screen. On models without a display, the operation light blinks a pattern - count the number of blinks between pauses to determine the code number. The letter prefix is determined by the blinking light color (green = operation, orange = timer).
Can I reset a Daikin error code without fixing the problem?
You can clear the code by turning off the breaker for 30 seconds, but the code will return if the underlying problem is not fixed. Repeatedly resetting without repair can cause additional damage, especially for compressor-related codes (E and L series).
Which Daikin error codes can I fix myself?
A3 (drain clog) is the most DIY-friendly - pour vinegar in the drain pan. Blinking light issues often resolve with a breaker reset. Most other codes, especially E and L series compressor codes, require a licensed HVAC technician.

Related Daikin Minisplit Error Codes

Code: U4Daikin U4: Communication FaultCode: E7Daikin E7: Outdoor Fan Motor FaultCode: A3Daikin A3: Drain Pan OverflowCode: U0Daikin U0: Low Refrigerant or OvercurrentCode: L5Daikin L5: Compressor Overcurrent

Models Known to Experience HUB Errors

This repair applies to most Daikin minisplits with this error code. Common model numbers include:

FTXS09LVJU, FTXS12LVJU, FTXS15LVJU, FTXM09QVJU, FTXM12QVJU, FTXM15QVJU, FTXM18QVJU, FTXM24QVJU

Last verified for technical accuracy on March 15, 2026