LG Aircon CH93 Error Code & Blinking Light
Use this LG CH93 guide to decide when to stop resetting, what to capture, and what to check before parts are quoted.
What Does LG CH93 Mean?
LG CH93 is listed as communication problem or outdoor-unit power issue. in Inverter Split, Multi-Split rows. The loaded row is source-backed by official diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.
Loose, corroded, crossed, or damaged indoor-outdoor signal wiring.
Terminal block, connector, or junction fault on the indoor or outdoor side.
Indoor or outdoor PCB communication circuit fault after wiring is proven sound.
What To Do Now
Use these steps before another reset, signal-wire check, or PCB quote.
Stop using the unit if CH93 returns
If CH93 returns after one reset, stop repeated restarts and get the matching source row diagnosed.
Reset CH93 once
Capture the CH93 pattern first, then power-cycle once only and note whether the same fault returns.
Send these to us
CH93 error code and blinking light, a clear display photo and blinking-light video if the unit shows one, LG model stickers, affected rooms, reset result, and whether one room or every room failed
Send Us What You're Seeing
Share CH93, your LG model, and what happened before it appeared. We'll read it and respond with the right next step before any work is approved.
What To Check Before Repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You Can Check | Technician Should Confirm |
|---|---|
| Before resetting CH93, take a clear display photo and blinking-light video if the unit shows one. | Match CH93 against the exact model-family source row before quoting parts. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Test communication terminals, cable continuity, polarity, and outdoor power. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | Read indoor and outdoor PCB indicators only after the signal path is proven sound. |
What Changes The Next Step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What You See | What It Points To |
|---|---|
| Only one indoor unit shows CH93. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same CH93 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| The fault returns immediately after one reset. | Start with the source-row diagnostic branch before approving parts. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to Inverter Split, Multi-Split rows. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Wiring Or PCB Decision
LG CH93 should start with terminal, signal-cable, and power checks. PCB replacement only makes sense after the communication path is proven sound.
A loose terminal or bad junction is a targeted repair once the path is confirmed.
Signal-wire replacement depends mostly on access through trunking, ceiling, or concealed routes.
PCB cost should be weighed against age only after wiring and power checks pass.
Read Next
Use these if the quote mentions the parts, checks, or repair path this code points to.
Other LG Error Codes
If the code you're seeing isn't CH93, jump to one of these or browse the full LG list.
Ready to Get Started?
Send the CH93 error code and blinking light, a clear display photo and blinking-light video if the unit shows one, and LG model sticker. Send the model sticker so the matching official row can be checked quickly. We can help separate wiring, terminal, and PCB checks.