Where is that water coming from?
Air conditioners remove gallons of water from the air every day. When the drainage system fails, your home is at risk of water damage.
Primary Causes & Explanations
Clogged Primary Drain Line
60% Prob.Algae, 'slime', and dust combine to plug the 3/4' PVC drain line, causing the internal pan to overflow.
Cracked or Rusted Drain Pan
20% Prob.In older units (especially horizontal ones), the metal drain pan can rust through, allowing water to bypass the drain entirely.
Failed Condensate Pump
15% Prob.If your system uses a pump to move water uphill, a failed motor or stuck float will cause an immediate backup.
Frozen Evaporator Coil
5% Prob.As ice on the coil melts, it often drips outside the pan, missing the intended drainage path.
Standard Troubleshooting Protocol
1
Locate the primary drain pan and check for standing water.
2
Inspect the emergency/secondary pan (if present) for moisture.
3
Use a wet/dry vac on the outdoor end of the drain line to clear obstructions.
4
Pour a small amount of water into the pan to verify it flows freely.
5
Check the float switch operation: Does lifting the float shut off the system?
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