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.

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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

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

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Send a short blink video and your model sticker. We'll advise the next step before any work is recommended.

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Other diagnostic tools

If your unit shows an error code or a different problem instead, try a different starting point.

Error codes

Display showing a code? Look up what it means for your brand.

Aircon problems

Diagnose a specific problem like no cooling, water leak, or noise.

Mitsubishi Electric (Starmex) brand hub

Guides, resources, and model info for Mitsubishi Electric (Starmex) aircon.

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