The most common error codes encountered on Fujitsu mini-split systems typically relate to indoor-outdoor communication failures, temperature thermistor sensor issues, or condensate drainage blockages. Communication errors (often indicated by flashing LED patterns corresponding to transmission faults) frequently stem from power interruptions or incorrect wiring sequences during installation. Additionally, drain float switch errors (such as code 09) occur frequently in humid environments when algae or slime restricts the condensate drainage path, forcing the system to shut down protectively until the pan and drain line are thoroughly cleaned and cleared.
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