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LG Mini-Split Error Codes: What Each Code Means

by Dua Jones April 24, 2026

LG mini-splits display error codes directly on the indoor unit's LED display panel or on the remote control LCD — making them among the easier brands to diagnose. Each code is an alphanumeric combination that points to a specific fault. This guide covers the most common LG mini-split error codes, what they mean, and the recommended first response.

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Common LG Mini-Split Error Codes

Error Code	Meaning	DIY Fix?	First Step
C1 / CH1	Indoor intake air temperature sensor fault	No	Reset at breaker; call tech if recurring
C2 / CH2	Indoor pipe (coil) temperature sensor fault	No	Call technician — thermistor replacement
C5 / CH5	Outdoor temperature sensor fault	No	Reset at breaker; call tech if recurring
E1	High pressure protection — outdoor unit	Partially	Clear outdoor unit airflow; reset; call tech if recurring
E3	Low pressure protection — possible refrigerant loss	No	Call technician — refrigerant leak check required
E4	High pressure protection (alternate)	Partially	Check outdoor unit airflow; reset breaker
E6	Communication error (indoor to outdoor)	Partially	Reset at breaker; check signal wiring connections
F1	Indoor unit freeze protection activated	Yes	Clean filter; let coil thaw 2–3 hrs; restart
F3	Outdoor high temperature protection	Partially	Clear debris from outdoor unit; ensure ventilation
dF	Defrost mode active	N/A — normal	Normal in heating mode — wait 3–10 minutes
Cl	Filter cleaning reminder	Yes	Clean filter; reset filter indicator on remote

What to Do When an Error Code Appears

Step 1: Write down the exact code before resetting anything.
Step 2: For filter codes (Cl) or freeze codes (F1), clean the filter first — this resolves the issue without a technician in most cases.
Step 3: Try a breaker reset — off 30 seconds, on, wait 3 minutes before operating.
Step 4: If the same code returns after reset, contact an LG Pro Gold certified contractor for diagnosis.

Frequently Asked Questions

How do I read LG mini-split error codes?

LG makes this straightforward — codes appear directly on the indoor unit's display panel or on the remote LCD. No need to count blinks like some other brands. If your unit only has an indicator light and no display, check the number of flashes: each set of flashes before a pause corresponds to a code number in your owner's manual.

Will a reset fix my LG error code?

A breaker reset clears the code. If the underlying fault is resolved (e.g., you cleaned a clogged filter causing F1), the code will not return. If the same code reappears within minutes of operation, the system has a real fault that needs technician attention.