An air conditioning unit freezes up due to two reasons:
- Restricted Air Flow – There is blockage or some type of restriction in the flow of air through your blower system.
- Low on refrigerant – Being low on refrigerant is a sign of a link in the line.
To understand what freezes up and why:
There is a coil called the evaporator coil that goes from the inside of the home to the outside condenser unit. It is transferring the heat from inside the home, to the outside, where the heat is evaporated off, cooled down and sent back inside to the blower unit. When this evaporator coil freezes up it is basically overcooling itself because of a lack of refrigerant, or restricted air flow.
Thing to do when this happens:
- Turn your air conditioning system completely off. (Not just turning the temperature gauge up)
- Check for air restriction in your duct system. Replace the air filter if it is dirty. Open up all air registers. Make sure there is nothing blocking the registers such as with furniture or drapes.
- After the ice has melted from the evaporator coil, start up your system again, and let it run for awhile. If the ice does not return to the coil, you’ve solved the problem.
- If the ice returns to the evaporator coil, call iRepair Heating and Air to come out and inspect your system for leaks or deeper air flow problems.