Symptoms
- Puddle or steady drip forming under or near the outdoor unit
- May be worse during humid weather
- Amount of water seems more than typical condensation
Likely causes
- CommonNormal condensation during humid weatherSome dripping from the unit is expected on hot, humid days and isn't a problem by itself.
- CommonIndoor condensate line routed to drain near the outdoor unitSome installations route the condensate drain to daylight near the condenser, which can look like a leak from the unit itself.
- PossibleIce on the coil melting after a freeze-upIf the system recently iced up, melting ice can create a temporary heavy drip outside.
- Less commonDamaged pan or coil inside the outdoor unit (heat pumps)On heat pump systems that also handle defrost cycles, a damaged internal pan can leak more than normal.
What to do
- Note whether the water is coming from a nearby condensate drain pipe or directly from under the unit's cabinet.
- Check whether the leak coincides with hot, humid days, which points to normal condensation.
- If the indoor coil recently had ice on it, allow time for it to fully melt and see if the outdoor leak stops.
- Look for a small drain hole at the base of the outdoor cabinet, which is a normal factory-designed drip point for defrost water on heat pumps.
- If the amount of water seems excessive or doesn't match weather or a recent freeze-up, have a technician inspect it.
- Clear away any grass or debris blocking normal drainage at the base of the unit.
When to call a pro
Call an HVAC technician if water from the outdoor unit is heavy, constant, and not explained by humidity or a recent ice thaw.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.