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Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS09NAH*** 6 blinksIndoor-outdoor serial-signal failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS18NAH*** 13 blinks / restartInverter DC bus-bar voltage detection failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS12NAH*** 2 blinks / restartOvercurrent protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS09NAH*** 12 blinks / restartCompressor phase-current detection failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS18NAH*** 4 blinks / restartFin or control-board temperature overheat protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS18NAH*** 17 blinksOutdoor refrigerant-system abnormality→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS15NAH*** 3 blinks / restartDischarge-temperature overheat protection→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MSZ-FS18NA*** Solid lampOutdoor control-system nonvolatile-memory failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS12NA*** 3 blinksOutdoor control-system nonvolatile-memory failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS06NAH*** 2 blinksOutdoor thermistor short or open circuit→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS18NAH*** 3 blinks / restartDischarge-temperature overheat protection→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MSZ-FS06NA*** 2 blinksIndoor coil or room-temperature thermistor failure→