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Error Code
The F3 error code indicates high-pressure protection in your Rinnai air conditioning unit. This error usually happens when the refrigerant pressure gets too high, potentially damaging the system.
Dirt or debris buildup on the coils can cause high pressure in the system.
Low refrigerant levels can cause high pressure by disrupting refrigerant flow.
The pressure sensor may be malfunctioning or providing incorrect readings.
Remove any dirt or debris from the coils to prevent blockages.
Ensure the refrigerant levels are correct and top up if necessary.
Have a technician check the pressure sensor for faults.
