On humid days an AC can remove several gallons of water. Algae and debris can clog the drain line, so the pan fills and a float switch shuts the system off, or water overflows. Keep the drain accessible, make sure attic units have a secondary pan with a switch, and have the line cleared at every tune-up.
Technical Consideration
Why do drains clog more in summer?
Long run times in humid weather mean constant water flow, which feeds algae and biofilm in the trap and line.
Attic and closet air handlers in rowhouses are especially vulnerable.
What does a float switch do?
It cuts power to the AC when water rises in the pan, protecting ceilings and floors.
If your AC stops and the pan is full, the switch is doing its job.
How can I prevent backups?
Ask for drain cleaning and a switch test at each tune-up, and keep the cleanout cap accessible.
Condensate pumps fail too; listen for them running and check for water in the reservoir.
Related services in Wilmington
- AC Tune-Ups in Wilmington, DE
- AC Repair in Wilmington, DE
- Ductless Mini-Split Repair in Wilmington, DE
Local verification resources
Before authorizing work, use the Delaware license lookup. For projects that may require approval, consult the City of Wilmington permit information or the authority serving the property.