ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner F6 error code

Difficulty: Hard · Cost: $150–$500 · Duration: Requires professional service

The F6 error means your Daikin air conditioner detected abnormal high pressure, which may be caused by refrigerant overcharging or disconnected thermistor connectors. This requires a qualified technician as refrigerant handling requires certification and specialised equipment.

Common causes

  • Refrigerant has been overcharged in the system
  • Heat exchanger deicer thermistor connector is disconnected
  • Outdoor air thermistor connector is disconnected
  • Liquid pipe temperature thermistor connector is disconnected
  • Outdoor unit PCB has a fault

How to fix it

  1. 1

    Contact a qualified technician to inspect the refrigerant charge level and thermistor connections

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