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== Troubleshooting ===== Blowing Warm Air & A-Coil Not Frozen ===Low on coolant. Refrigerant doesn't require periodical charging. It is not a consumable item within an air conditioning unit, unless, there is a leak within the system. Given that it worked previously, and now it is not working, it is likely there is a leak in the system.=== Blowing Warm Air & A-Coil Iced Over ===The A-Coil can freeze up, building up ice and lowering efficiency. When completely frozen over it will not function. One cause if this happening is lack of circulation, due to the fan malfunctioning or insignificant fan speed, or and undersized blower. Increasing air circulation though the system can prevent the A-Coil from freezing over. If the air conditioner is not properly charged, such as too much or little coolant (pressure) then the system may operate in an inefficient way and also cause the A-Coil to freeze up. Turn off the unit and allow the A-Coil to thaw completely. Make sure the tray below the A-Coil is not pooling with water. It should be able to drain out a hose.