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Samsung Mini-Split Error Codes: Full Guide in 2026

by Dua Jones April 28, 2026

Samsung mini-splits display fault codes as alphanumeric codes on the indoor unit's LED display or within the SmartThings app for connected models. Samsung's Wind-Free ductless lineup uses a distinct error code system that differs from many other brands — some codes are specific to Wind-Free technology features. This guide covers the most common Samsung mini-split error codes and recommended first responses.

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Common Samsung Mini-Split Error Codes

Error Code	Meaning	DIY Fix?	First Step
C1	Indoor unit communication error	Partially	Reset at breaker; check signal wire connections
C4	Indoor unit coil temperature sensor fault	No	Reset; call tech if recurring — thermistor
C5	Outdoor unit coil temperature sensor fault	No	Call technician — thermistor replacement
E1	High pressure protection	Partially	Clear outdoor unit airflow; reset at breaker
E2	Low pressure protection / refrigerant issue	No	Call EPA-certified technician — refrigerant leak check
E3	Outdoor unit PCB / compressor issue	No	Reset; call technician if recurring
F1	Indoor intake temperature sensor fault	No	Reset; call tech if recurring — thermistor
OF	Outdoor unit fault — general protection	Partially	Reset at breaker; check outdoor unit airflow
CF	Filter cleaning reminder (not a fault)	Yes	Clean filter; reset filter indicator

Samsung SmartThings Error Reporting

Samsung mini-splits connected to the SmartThings app can report error codes directly within the app with descriptions. If your unit is connected, check the SmartThings app first — it often provides a clearer description of the fault than counting blinks or reading a short code. SmartThings can also send push notifications when a new error code is detected.

Frequently Asked Questions

My Samsung mini-split shows CF — is this serious?

No — CF is a filter cleaning reminder, not a fault. The unit tracks runtime hours and displays CF when it is time to clean the filter. Clean the filter following the steps in your owner's manual, then reset the indicator by pressing and holding the FILTER button on the remote for 3 seconds until CF clears from the display.

My Samsung shows E2 — can I fix it myself?

E2 (low pressure protection) indicates insufficient refrigerant pressure in the system — almost always the result of a leak. This cannot be resolved without EPA-certified refrigerant handling. A technician must locate the leak, repair it, and recharge the system. Continuing to operate with E2 active risks compressor damage.