ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner UF error code

Difficulty: Medium · Cost: $0–$250 · Duration: 10–20m

The UF error means your Daikin air conditioner system has not been properly set up. This can be caused by improper transmission wiring between indoor-outdoor units, failure to execute the check operation, a defective indoor unit PCB, or a stop valve not being opened. Check the stop valves and wiring then run the check operation.

Common causes

  • Improper connection of transmission wiring between indoor and outdoor units
  • Check operation has not been executed
  • Defective indoor unit PCB
  • Stop valve is not opened

How to fix it

  1. 1

    Check that all refrigerant stop valves on the outdoor unit are fully open

  2. 2

    Check that the transmission wiring between indoor and outdoor units is correctly connected

  3. 3

    Run the check operation following the instructions in the installation manual

  4. 4

    If the error persists contact a qualified technician

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

UF error — frequently asked questions

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

The system has not been set up yet — check transmission wiring and run check operation

What causes the UF error?

The UF error is usually caused by: Improper connection of transmission wiring between indoor and outdoor units; Check operation has not been executed; Defective indoor unit PCB; Stop valve is not opened.

Can I fix the UF error myself?

It's possible for a moderately handy person, but budget 10–20m and expect some disassembly.

How much does it cost to fix the UF error?

Fixing the UF error on a Daikin air conditioner typically costs $0–$250, depending on parts and whether you do it yourself or hire a technician.

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

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