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Daikin Mini-Split Error Codes: Full List and Meanings

by Dua Jones April 23, 2026

Daikin mini-splits display fault codes through a flashing operation indicator light on the indoor unit. The number of flashes in each sequence corresponds to a specific error code. Units with a wired BRC remote display alphanumeric codes directly. This guide covers the most common Daikin error codes, what they mean, and the recommended first response for each.

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How to Read Daikin Error Codes

Watch the OPERATION indicator on the indoor unit's front panel. Count the number of flashes before the pause — this number is the error code. The sequence repeats after a 2–3 second pause. Some codes appear as a combination of OPERATION and TIMER light flashes.

For units with a Daikin BRC wall controller or wired remote, the error code appears on the display as a two-character code (e.g., A1, A3, C4, E1).

Common Daikin Error Codes

Error Code	Flashes	Meaning	First Step
A1	1	Indoor unit PCB (control board) fault	Reset at breaker; call tech if recurring
A3	3	Drain level fault / float switch	Clear condensate drain line
A5	5	Freeze protection — indoor coil temperature too low	Clean filter; check airflow; let coil thaw
A6	6	Indoor fan motor overcurrent / fault	Check for obstructions; call technician
C4	4 (timer light)	Heat exchanger (coil) temperature sensor fault	Call technician — thermistor replacement
C9	9 (timer light)	Intake air temperature sensor fault	Call technician — thermistor replacement
E1	1 (outdoor)	Outdoor unit PCB fault	Reset at breaker; call tech if recurring
E3	3 (outdoor)	High pressure protection	Check outdoor airflow; call tech if recurring
E4	4 (outdoor)	Low pressure protection	May indicate refrigerant loss — call technician
E5	5 (outdoor)	Outdoor unit overcurrent	Reset at breaker; check electrical supply
E7	7 (outdoor)	Outdoor fan motor fault	Check for debris around outdoor unit; call tech
EA / EE	Alphanumeric display	Reversing valve fault (no heat/cool switching)	Call technician — reversing valve replacement
L4	Alphanumeric display	Outdoor heat sink overheat	Clear outdoor unit airflow; check for blockage
U0	Alphanumeric display	Insufficient refrigerant	Call technician — refrigerant leak check required
U4 / UF	Alphanumeric display	Communication error (indoor to outdoor)	Reset at breaker; check signal wiring

What to Do When an Error Appears

Step 1: Record the flash count or alphanumeric code before resetting anything.
Step 2: Try a breaker reset — off 30 seconds, on, wait 3 minutes before operating.
Step 3: For drain codes (A3), manually clear the condensate drain with a wet/dry vac or flush with water.
Step 4: If the same code returns after reset, the system has a real fault. Contact a Daikin Comfort Pro contractor.

Frequently Asked Questions

How do I find the error code on my Daikin mini-split?

Count the flashes on the OPERATION indicator on the front of the indoor unit. Each set of flashes before the pause is the error code number.

If you have a Daikin BRC wall-mounted controller, press the ON/OFF and FAN buttons simultaneously to enter diagnostic mode and display the code directly.