ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner U7 error code

Difficulty: Hard · Cost: $80–$300 · Duration: Requires professional service

The U7 error means your Daikin air conditioner system detected a communication failure between outdoor units or between an outdoor unit and an external control adaptor. This can be caused by a connection error in the transmission wiring or a defective outdoor unit PCB. Contact a qualified technician.

Common causes

  • Connection error in transmission wiring between outdoor units
  • Connection error between outdoor unit and external control adaptor
  • Defective outdoor unit PCB

How to fix it

  1. 1

    Contact a qualified technician to inspect the outdoor unit transmission wiring and PCBs

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