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Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS15NA*** 12 blinks / restartCompressor phase-current detection failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS18NAH*** 2 blinks / restartOvercurrent protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS18NAH*** 3 blinks / restartDischarge-temperature overheat protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS12NA*** 5 blinks / restartHigh-pressure protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS15NA*** 6 blinksOutdoor thermistor failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS09NA*** 3 blinks / restartDischarge-temperature overheat protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS06NA*** 2 blinksIndoor coil or room-temperature thermistor failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS09NA*** 3 blinksIndoor fan motor failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS12NA*** 1 blinkMiswiring or serial-signal failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MSZ-FS18NA*** Solid lampOutdoor control-system nonvolatile-memory failure→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS06NA*** 2 blinks / restartOvercurrent protection→ Troubleshooting · Trane / Mitsubishi ElectricTrane / Mitsubishi Electric MUZ-FS15NA*** 4 blinks / restartFin or control-board temperature overheat protection→