A mini split blinking light is the unit's self-diagnosis: the number of blinks, or the code on the display or remote, points to a fault such as a sensor, drain, communication or refrigerant problem. Codes differ by brand and model, so note the pattern and check your manual. A single power reset can clear a temporary fault; if the code returns, the fault is real.
When a mini split stops and a light starts flashing, it's telling you what's wrong, in its own language. Here's how to read it and what to do next.
Most mini splits stop and blink when their self-check finds a fault. Some blinks aren't faults at all: some brands blink during a test run, after a power cut, or as a filter reminder. Before you call, note:
Codes vary by model, even within one brand, so always check the manual for your exact unit.
On many Mitsubishi Electric units, the operation indicator lamp blinks when the unit stops because of a fault. The manuals describe a self-check: with the remote display off, press the CHECK button twice and point the remote at the unit; the unit then reports the check code by beeps and lamp blinks. In the Mitsubishi manuals we checked, codes cover areas such as sensor errors, drain problems (P4, P5) and indoor-outdoor communication errors (E6, E7). Check your model's manual for its exact list.
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Daikin units show a letter-and-number code. In Daikin's service manuals, U4 is a signal transmission (communication) error between the indoor and outdoor units, and A5 is freeze-up protection in cooling (the indoor coil got too cold) or high-temperature protection in heating. An A5 resets automatically once the temperature is back in range; a recurring one points to an airflow or refrigerant problem.
Fujitsu General says to count the blinks of each indicator lamp, typically the Operation and Timer lamps, and give the pattern and model name to service. It also notes that some patterns aren't faults: the lamps blinking alternately can follow a power interruption, and blinking together can mean a test run.
LG shows "CH" codes. According to LG's support pages, CH05 (and CH53 or E0 on some models) means a communication problem between the indoor and outdoor units, often after the outdoor breaker trips. LG also says CH32, CH33, CH36 and CH38 point to a refrigerant or compressor-related problem.
Most brands use similar letter-and-number codes (often starting with E, F or P) or blink counts. Their meanings differ by model, so check the manual for your unit rather than a general list online.
Sometimes. LG recommends turning the power off for about five minutes, then on again; if the code persists, request service. Do the reset once. If the same code comes back, the fault is real and needs a technician.
Call if the code returns after a reset, or if it points to communication, compressor or refrigerant problems. Those need diagnosis with proper tools. We service all major mini split brands, and our $125 diagnostic is credited toward the repair if you go ahead. If the unit is simply not cooling, see our guide to a mini split not cooling, and for prices see mini split repair cost.
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Sources: Mitsubishi Electric Mr. Slim user and service manuals (self-check and check codes); Daikin service manuals (U4 and A5 error codes); Fujitsu General, indicator lamp FAQ (fujitsu-general.com); LG USA Support, CH05 and error code guides (lg.com).
It has likely stopped because its self-check found a fault, or it's in a defrost cycle or test run. Count the blinks, check the manual for your model and try one power reset. If the light keeps blinking, call.
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