The coolant line to the outside unit of my air conditioner is frozen. What's wrong?
Saturday, September 29, 2018
There are a number of different defects that can cause the larger of the two refrigerant lines, called the “liquid line” or “suction line," to ice over like in the photo above. Here’s three of the most common causes:
- Low refrigerant gas level due to leak.
- Anything that restricts air flow, such as a dirty air filter, dirty evaporator coils (the piping on the inside unit), blocked ducts, or closed dampers.
- Any restriction in the refrigerant flow, such as a kink in the line or restricted filter-drier.
An air conditioning technician can evaluate the problem and make the necessary repair. Low refrigerant gas level due to slow leak is the most common defect that we find causing an iced-over liquid line, but any of the other ones listed are also likely culprits.
Also, see our blog post Why is my air conditioner not cooling enough?
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