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Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS06NA*** 4 blinksIndoor control-system failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS09NAH*** 11 blinksStop valve or closed-valve condition→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS12NA*** 4 blinks / restartFin or control-board temperature overheat protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS15NA*** 3 blinksOutdoor control-system nonvolatile-memory failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS18NA*** 2 blinksIndoor coil or room-temperature thermistor failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MSZ-FS18NA*** 2 blinksIndoor coil or room-temperature thermistor failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS09NAH*** 3 blinksOutdoor control-system nonvolatile-memory failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS15NA*** 2 blinksOutdoor thermistor short or open circuit→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS18NA*** 10 blinks / restartOutdoor fan motor failure→ Troubleshooting · Mitsubishi ElectricMitsubishi Electric MUZ-FS12NA*** 2 blinks / restartOvercurrent protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS18NA*** 5 blinksOutdoor power-system abnormality→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS15NA*** 6 blinksIndoor-outdoor serial-signal failure→