LG aircon 13 error code
Use this LG 13 error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted. Cross-check the exact model because the row is unofficial.
What does LG 13 mean?
LG 13 is listed as rAC product = PSC (reactor) error, text 27 for help in the loaded residential diagnostic rows. The loaded row is unofficial, so do not approve parts from this code alone. Confirm the exact model, series, or signal row before accepting a parts quote.
Indoor and outdoor unit capacity, jumper, model, or platform mismatch.
Incorrect setting after installation, PCB change, or mixed-system work.
Communication or board configuration issue if the setting is correct but the fault returns.
What to do now
Use these steps before another reset or parts quote.
Stop using the unit if 13 returns
If 13 returns after one reset, stop repeated restarts and get the matching source row diagnosed.
Reset 13 once
Capture the 13 display first, then power-cycle once only and note whether the same fault returns.
Send these to us
13 error code, a clear display photo, LG model stickers, affected rooms, reset result, recent installation, PCB, or model-pairing work, and exact model so the source can be cross-checked
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Source repair action | RAC product = PSC (reactor) error, text 27 for help. |
| Singapore / model note | Unattributed LG fault-code list; confirm against the installed model/service manual before applying. |
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 13, take a clear display photo. | Confirm the exact model pairing behind 13. |
| Capture the LG indoor and outdoor model stickers so the correct family row is used. | Check jumper caps, capacity settings, paired indoor/outdoor model compatibility, and recent board changes. |
| Treat the code as a starting point and note the exact symptoms because this row is not brand-official yet. | Only quote parts after configuration and communication checks are ruled out. |
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 13. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same 13 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 the loaded residential diagnostic rows. | The loaded row is unofficial, so do not approve parts from this code alone. Use the matching source row before quoting parts. |
Configuration or parts decision
LG 13 can often be corrected by matching settings, model pairing, or board configuration. Parts should be quoted only after setup is confirmed.
Wrong capacity or pairing settings can mimic a hardware fault.
Recent installation, PCB replacement, or mixed-model work changes the first check.
Once configuration is confirmed, the diagnosis can move to wiring or board inputs.
LG 13 questions
What does the LG 13 error mean?
Can I fix a LG 13 error myself?
Is it safe to keep running the aircon with a 13 error?
What causes a LG 13 error?
Will a LG 13 error need a repair or a full replacement?
What should I send a technician about a LG 13 error?
Confirm the fault
Share the error code, model number and symptoms so we can assess the likely cause.
Not the right code?
Browse the full LG list or check a few codes in the same fault category.
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Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.