Clogged condensate drains cause most summer AC short-cycling

When an air conditioning system runs for 5 minutes then shuts off repeatedly, the most common cause is a clogged condensate drain triggering the float switch — not a refrigerant or compressor issue. The IRC Section M1411.3 requires condensate disposal systems. Maintenance: pour distilled vinegar through the cleanout tee seasonally. Avoid bleach, which can degrade PVC cement over time.