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Error Code
The C5 error code on your Fujitsu air conditioning unit indicates that the system has detected a freeze-up condition. This error occurs when the evaporator coils freeze, disrupting the normal operation of the system.
Dust and dirt buildup on the coils or filters can cause the system to freeze.
Low refrigerant can lead to abnormal cooling and freezing of coils.
Insufficient airflow due to blockages or a malfunctioning fan can cause the coils to freeze.
Ensure that there is no buildup of dust or dirt on the coils and filters.
Low refrigerant may need to be topped up by a professional.
Make sure there are no blockages in the airflow, and the fan is functioning properly.
