Blink count: 1
Upper/left operation lamp flashes 1 time repeatedly (about 0.5-second cycle)
Room thermistor short/open circuit · Thermistor connector issue · Indoor PCB sensor input fault
Mitsubishi Electric (Starmex) Aircon Blinking Light Patterns
Learn what common Mitsubishi Electric (Starmex) blink patterns mean, what typically causes them, and whether they need urgent attention.
Mitsubishi Electric (Starmex) blink guide
This is a guidance table, not a model-exact diagnosis. Pattern meaning can vary by controller and series. Use this page to narrow next steps, then verify with model sticker details.
Safety Warning
Stop using the unit and contact a technician if the breaker trips repeatedly, you smell burning, see sparks, hear loud electrical buzzing, or water is leaking from places it normally should not.
Blink count: 2
Operation lamp flashes 2 times, then about 2.5 seconds OFF, then repeats
Indoor coil thermistor short/open · Thermistor harness fault · Indoor board sensor circuit issue
Blink count: 3
Operation lamp flashes 3 times, then about 2.5 seconds OFF, then repeats
Indoor-outdoor serial communication issue · Control wiring instability · Indoor or outdoor PCB signal fault
Blink count: 4
Operation lamp flashes 4 times, then about 2.5 seconds OFF, then repeats (inverter models)
Indoor fan feedback abnormality · Indoor PCB failure · Fan motor drive/control issue
Blink count: 6
Operation lamp flashes 6 times, then about 2.5 seconds OFF, then repeats (inverter models)
Outdoor thermistor short/open · Outdoor thermistor connector fault · Outdoor PCB sensor-input issue
Blink count: 7
Operation lamp flashes 7 times, then about 2.5 seconds OFF, then repeats (inverter models)
Indoor-outdoor communication receiving error · Control wiring fault · Indoor or outdoor PCB fault
Blink count: 11
Operation lamp flashes 11 times, then about 2.5 seconds OFF, then repeats
Indoor fan feedback signal missing · Fan motor fault · Indoor drive/PCB issue
Blink count: 14
Operation lamp flashes 14 times, then about 2.5 seconds OFF, then repeats
Low refrigerant condition · Unit pump-down/short-cycling state · Outdoor fan lock leading to circuit stress
Blink count: Not applicable
When operation lamp is blinking, remote CHECK mode can display a 2-digit error code
Indoor unit has detected a fault · User initiated CHECK mode for diagnosis · Need to identify exact code before service call
Not sure how to read your Mitsubishi Electric (Starmex) blink pattern?
Send a short blink video and your model sticker. We'll advise the next step before any work is recommended.
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