Unfortunately, things don’t always go according to plan. If your AC unit starts leaking water, there are a few possible reasons. We’ll examine them in more detail below.
Broken Condensate Pump
If your furnace and indoor AC unit are installed in your basement, a condensate pump sends the water outside. If that pump breaks, the water won’t be pumped outside anymore and will start to build up. You’ll need to repair or replace the pump, which is a task best handled by a professional.
Clogged Drain Line
A clogged condensate drain line is a common problem if your AC leaks inside. Over time, the drain pipe can become clogged with debris such as dirt, dust, or mold. This means water can’t escape your plumbing system and drain outside.
You can unclog the drain line using a wet/dry vac to remove debris. This should remove anything causing a clog, freeing the line to allow water to escape again. If the wet/dry vac doesn’t work, you may need to call a professional.
Damaged Drain Pan
The AC’s drain pan may be damaged or rusted due to old age, allowing water to fall through. If your air conditioner is more than 15 years old, you may need to replace the pan.
Dirty Air Filter
Check your air filter to see if it’s dirty and needs to be changed. You should do this every one to three months. Dust and debris block airflow over the evaporator coil, causing the coil to freeze too cold. Once the ice melts, it drips excess water that the drain pan may not be able to handle.
Your air conditioning system might be low on refrigerant. One sign of this is if your air conditioner isn’t effectively cooling your house. Another is a hissing or bubbling noise, which indicates a refrigerant leak. Depending on the severity of the leak, you may need to replace your whole AC unit.
Like a dirty air filter, low refrigerant can cause your evaporator coil to freeze over. The evaporator coil will also freeze when your AC system has lower pressure. When the ice melts, it creates excess water. This issue is best handled by a professional used to dealing with refrigerants.