Water or Ice Around Unit in Liberty Lake, WA

There are several distinct mechanical failures that produce water or ice. Understanding them helps you know what you are dealing with.

Restricted Airflow Across the Evaporator Coil

Your evaporator coil works by absorbing heat from warm air passing over it. The refrigerant inside the coil stays cold - around 40°F under normal conditions. When airflow drops, the coil gets too cold and the moisture in the air freezes on contact instead of draining away as condensate.

What restricts airflow? A clogged air filter is the most common cause. A collapsed return duct, a closed supply register, or a failing blower motor can all produce the same result. The coil does not know why the air stopped moving - it just freezes.

Low Refrigerant (Refrigerant Leak)

Refrigerant is not a consumable. Your system runs on a sealed charge that should last the life of the equipment. If refrigerant is low, it leaked out somewhere.

Low refrigerant causes the pressure inside the evaporator coil to drop below normal. Lower pressure means lower temperature - sometimes well below freezing. The coil ices over, airflow drops further, and the cycle accelerates. You end up with a block of ice where a coil should be.

This matters for Liberty Lake homeowners specifically. A significant portion of the housing stock here was built during the building booms of the late 2000s and early 2010s. Those builder-grade AC systems are now 12 to 18 years old - right at the age when refrigerant line connections, Schrader valves, and coil joints start to develop small leaks. If your system is in that age range and you are seeing ice, a slow refrigerant leak is a real possibility.

Clogged Condensate Drain Line

When your AC runs normally, it pulls moisture out of your home's air. That moisture drips off the evaporator coil into a drain pan, then flows out through a condensate drain line - usually a PVC pipe that exits through a wall or into a floor drain.

Over time, algae, dust, and debris build up inside that line. When it clogs, the drain pan fills up and overflows. That is the puddle you found on the floor.

A clogged drain line is one of the more straightforward repairs, but it still needs a proper diagnosis to confirm that is the only issue and that no water damage has already occurred.

Dirty Evaporator Coil

A coil caked with dust and debris cannot transfer heat efficiently. The refrigerant inside stays colder than it should, and moisture freezes on the coil surface instead of draining. A dirty coil also restricts airflow - compounding the problem.

This is a maintenance issue, but it does not make it less serious. A heavily fouled coil can cause the same cascade of problems as a refrigerant leak.

Drain Pan Damage or Improper Slope

The drain pan sits directly under the evaporator coil. If it is cracked, rusted through, or installed at the wrong angle, water bypasses the drain line entirely and ends up on your floor. In older systems, this is more common than most homeowners expect.

Before you call - or while you wait - here are a few safe checks you can do yourself.

• Turn the system off. Set your thermostat to "off" or switch to fan-only mode. Do not run a frozen system. Let the ice melt before a technician arrives - it makes the diagnosis faster and more accurate.
• Check your air filter. Pull it out and hold it up to a light. If you cannot see light through it, it is overdue for replacement. A clogged filter is the single most common cause of a frozen coil.
• Look at the condensate drain line. It is usually a white PVC pipe near the air handler. Check if water is dripping out of the end - if it is not, the line may be clogged.
• Check the drain pan. If you can safely access it, look for standing water or rust. A small amount of water is normal. A full pan is not.
• Do not chip ice off the coil. You will damage the fins or puncture a refrigerant line. Let it thaw on its own with the system off.