ErrorCodeDoctor
LG · Air Conditioner

LG Air Conditioner CH93 error code

Difficulty: Medium · Cost: $0–$150 · Duration: 5–10m

The CH93 error means your LG air conditioner's indoor and outdoor units are having trouble communicating with each other. It most commonly appears during the test run after a new installation when the communication between the two units has not stabilised yet. On models released after 2021 this error can also appear if the outdoor unit is not receiving power at all — making it worth checking the power cord and cable connections before calling a technician. If it appears during normal use a power cycle will often resolve a temporary fault.

Common causes

  • Communication between indoor and outdoor units not yet stable after installation or relocation
  • Outdoor unit is not receiving power on models released after 2021
  • Power cord or cable connections to the outdoor unit are loose or disconnected
  • Unstable power supply causing a temporary communication breakdown
  • Communication wiring between units is damaged or incorrectly connected

How to fix it

  1. 1

    If the error appeared after installation check that the outdoor unit is receiving power

  2. 2

    Inspect the outdoor unit power cord and all cable connections between the indoor and outdoor units

  3. 3

    If connections look correct but the error persists contact the installation technician

  4. 4

    If the error appeared during normal use unplug the power cord or turn off the circuit breaker and wait 5 minutes

  5. 5

    Restore power and check if the error has cleared

  6. 6

    If CH93 keeps returning after a power cycle contact a technician for a full inspection

Related LG Air Conditioner error codes

1

CH04

The indoor unit is not draining condensate water properly

easy
2

CH05

Communication between the indoor and outdoor units has been lost

medium
3

CH07

Two connected units are set to conflicting operating modes

easy
4

CH38

The air conditioner is low on refrigerant gas

hard

CH93 error — frequently asked questions

What does the CH93 error mean on a LG air conditioner?

Communication between the indoor and outdoor units is unstable or has failed

What causes the CH93 error?

The CH93 error is usually caused by: Communication between indoor and outdoor units not yet stable after installation or relocation; Outdoor unit is not receiving power on models released after 2021; Power cord or cable connections to the outdoor unit are loose or disconnected; Unstable power supply causing a temporary communication breakdown; Communication wiring between units is damaged or incorrectly connected.

Can I fix the CH93 error myself?

It's possible for a moderately handy person, but budget 5–10m and expect some disassembly.

How much does it cost to fix the CH93 error?

Fixing the CH93 error on a LG air conditioner typically costs $0–$150, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my air conditioner with the CH93 error?

In most cases yes, but it's best to address the CH93 error soon — see the fix steps below to resolve it.