Indoor fan motor fault: the fan is not reporting rotation. The left lamp blinks 3 times, then pauses 2.5 seconds.
Mitsubishi 3 blinks on MSZ-FS table 9-4 are the indoor fan: the rotation feedback signal is not emitted while the fan should be running. 5 blinks are the outdoor power system, after the compressor has already stopped three times for overcurrent or start-up failure. The failure-mode recall function uses different blink counts. Do not mix the two tables.
Likely causes
- Indoor fan motor not reporting rotation
Safe checks for 3 blinks
- Write down a 3-blink pattern, then switch off the breaker. Do not open the indoor unit to spin the fan
- Techniciansection 9-6 starts by checking for foreign matter in the line-flow fan, with power off, then measures the fan-motor connector
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Three blinks are the indoor fan. Five blinks are the outdoor power system. Call a licensed HVAC technician.
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