Error code · Room Air Conditioner

LG Air Conditioner Codes CH237 and CH247: Outdoor Unit Has No Power

Medium · inspection needed

Code: CH237 / CH247
Appliance: Room Air Conditioner
Brand: LG
Warranty: 30-day workmanship

What CH237 / CH247 means

CH237 and CH247 appear on LG air conditioners made after 2021 whose indoor and outdoor units have separate power cords. The indoor unit is reporting a communication error because the outdoor unit is not receiving any power. The owner sees the code, the indoor unit may run its fan, and no cool air comes out because the outdoor unit never starts. Plug-in window and portable units are single cabinets, so this applies to the split style.

Common causes of CH237 / CH247

Outdoor unit power cord unplugged or loose in its outlet
Outlet or breaker feeding the outdoor unit without power
Outdoor unit power input circuit

✓ One safe check you can try

1. Look at the outdoor unit power cord and make sure it is firmly plugged in. 2. Check the breaker or outlet that feeds it, and reset a tripped breaker once. 3. Wait a minute, then start the indoor unit again. 4. If the code stays, switch the system off and arrange service.

! Why to stop there

If the cord and outlet are fine, we measure the supply at the outdoor unit and test its power input.
We check the communication line between the units after power is confirmed.
We write up what we found and give a written price first.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Room Air Conditioner codes

LED Too BrightLG Air Conditioner LED Too Bright: Remote Brightness Control LoLG Air Conditioner Message Lo: Low Room Temperature "Outdoor Unit" MessageLG Air Conditioner "Outdoor Unit" Message: Status Display SP, CP, POLG Air Conditioner Codes SP, CP, PO: Power Cooling Mode F1, F2, F3LG Air Conditioner Codes F1, F2, F3: Fan Speed Readout FLLG Air Conditioner Code FL: Condensate Tank Full HiLG Air Conditioner Message Hi: High Room Temperature Lamp Does Not LightLG Air Conditioner Lamp Off After Shutdown: Filter Alarm Timing

CH237 / CH247CH237 / CH247 questions

Why does the indoor unit show a communication error?

The two units talk to each other, and an outdoor unit with no power cannot answer. The indoor unit reports the missing reply as a communication error.

Which units have the separate power cord?

This applies to LG air conditioners made after 2021 where the outdoor unit has its own cord. Check whether your outdoor unit plugs in separately before using this reading.

Is it enough to plug the cord back in?

Often, yes. If the cord was loose or pulled out, restoring power lets the units communicate again. If the cord is in and the code stays, we test the supply.

Book a visit

Still seeing CH237 / CH247?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 597-5662