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LG · Air Conditioner

LG Air Conditioner CH237 error code

Difficulty: Easy · Cost: $0 · Duration: 2–5m

The CH237 and CH238 errors appear on LG air conditioner models manufactured after 2021 that use a separate power cord for the outdoor unit. Unlike older models where the indoor unit powers both units, these newer models require the indoor and outdoor units to each be independently connected to power. If the outdoor unit is unplugged or its circuit breaker is off the indoor unit cannot communicate with it and displays this error. The fix is usually as simple as plugging the outdoor unit back in or switching its breaker back on.

Common causes

  • Outdoor unit power cord is unplugged or not connected to a wall outlet
  • Circuit breaker for the outdoor unit has tripped or been switched off
  • Power strip being used instead of a direct wall outlet causing insufficient power
  • Outdoor unit power cord is damaged or not fully inserted into the outlet

How to fix it

  1. 1

    Check that the outdoor unit power cord is plugged directly into a wall outlet — not a power strip

  2. 2

    If it is unplugged plug it securely into a wall outlet

  3. 3

    Check the circuit breaker for the air conditioner and switch it back on if it has tripped

  4. 4

    Do not attempt to reset the breaker repeatedly if it will not stay on — contact a technician in that case

  5. 5

    Avoid using a power strip with any air conditioner unit as it may not provide enough capacity

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

CH237 error — frequently asked questions

What does the CH237 error mean on a LG air conditioner?

The outdoor unit is not receiving power and cannot communicate with the indoor unit

What causes the CH237 error?

The CH237 error is usually caused by: Outdoor unit power cord is unplugged or not connected to a wall outlet; Circuit breaker for the outdoor unit has tripped or been switched off; Power strip being used instead of a direct wall outlet causing insufficient power; Outdoor unit power cord is damaged or not fully inserted into the outlet.

Can I fix the CH237 error myself?

Yes — this is rated an easy fix that most people can do themselves, typically in 2–5m.

How much does it cost to fix the CH237 error?

Fixing the CH237 error on a LG air conditioner typically costs $0, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my air conditioner with the CH237 error?

In most cases yes, but it's best to address the CH237 error soon — see the fix steps below to resolve it.