Comfort Aire Mini Split Error Codes. Ventilation.
Good ventilation protects both your health and your home. Ventilation is especially important in bathrooms to remove unwanted moisture. This helps prevent the growth of mold and mildew, which can cause allergic reactions and aggravate lung diseases such as asthma. During renovation, be sure to check that your bathroom fan is functioning properly. This means not only that the motor makes noise or that the fan is running; it needs to be exhausting a sufficient amount of air*. And the air should be exhausted directly to the outside, and not just into an attic or some other space in the house.
If you do not have a bathroom exhaust fan or if your current fan is not working, you should install one. In cold climates, bathroom exhaust fans can be used as part of a strategy to provide ventilation for the whole house.
It should be obvious that all efforts should be made to avoid problems with water in the bathroom. Leaks should be fixed. Condensation problems should be addressed. Wet walls should be constructed to effectively keep water from penetrating cavities in the walls and floor.
Despite good ventilation, moisture-laden air from the bathroom can still make it's way into wall and ceiling cavities. A bathroom remodeling project may present opportunity to improve air-sealing. Electrical, plumbing, and ventilation penetrations should be sealed where they are accessible or in any walls that are opened. Depending on how they were constructed, soffits can be troublesome to air-seal, but if you are replacing bath fixtures or cabinets, you may be able to access space that would otherwise be difficult to reach.
Most home heating and cooling systems, including forced air heating systems, do not mechanically bring fresh air into the house. Opening windows and doors, operating window or attic fans, when the weather permits, or running a window air-conditioner with the vent control open increases the ventilation rate. Local bathroom or kitchen fans that exhaust outdoors remove contaminants, including moisture, directly from the room where the fan is located and also increase the outdoor air ventilation rate.
Mini Split AC in the USA 