ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner C4 error code

Difficulty: Hard · Cost: $80–$250 · Duration: Requires professional service

The C4 error means your Daikin air conditioner detected a fault with the liquid pipe thermistor for the indoor heat exchanger. This sensor monitors the temperature of the liquid refrigerant pipe. Contact a qualified technician to test and replace the thermistor.

Common causes

  • Liquid pipe thermistor is defective
  • Indoor unit PCB has malfunctioned
  • Thermistor connector has a poor contact

How to fix it

  1. 1

    Contact a qualified technician to test and replace the liquid pipe thermistor

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