Troubleshooting a Fujitsu mini-split system begins by observing the indicator lamps flashing on the indoor air handler or pulling the specific two-character error code via the wired remote controller by holding down the temperature buttons. Common preliminary steps include performing a hard power reset by shutting off the breaker for five minutes, removing and washing the dust-clogged air filters, and checking the outdoor condensing unit for physical obstructions or blocked airflow. If error codes persist—such as communication faults, thermistor sensor failures, or refrigerant pressure warnings—users must reference the service manual or contact a certified professional technician, as attempting unauthorized electrical or refrigerant repairs can void warranties and cause system damage.
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