Cooling Emergency
AC Keeps Tripping the Breaker?
Resetting the breaker only for it to trip again minutes later? Stop resetting — here's what's going on.
What's Going On
Understanding the Problem
Your AC starts up, runs for a few seconds to a few minutes, then trips the circuit breaker. You reset it, the same thing happens. This is your electrical system protecting itself from an overcurrent condition. The breaker is doing its job — something in the AC system is drawing too much power.
Diagnosis
Common Causes
1Dirty condenser coils
When the outdoor unit's coils are caked with dirt, the system has to work much harder to cool. This extra load draws more electrical current, eventually exceeding what the breaker allows.
2Failing compressor
An aging compressor can develop a condition called "hard starting" where it draws excessive current trying to start. Or internal windings can short, creating a direct overcurrent situation.
3Bad capacitor
A failing capacitor doesn't provide enough starting boost to the compressor, causing the compressor motor to draw too much current trying to start on its own.
4Short in the wiring
Damaged wire insulation (from heat, age, or critter damage) can cause a short circuit that immediately trips the breaker. This is a fire hazard.
5Grounded compressor
The insulation on the compressor motor windings can break down over time, causing the electrical current to flow to ground through the compressor housing. This trips the breaker instantly.
6Wrong size breaker
If someone recently worked on the electrical panel and installed a breaker that's too small for the AC circuit, it'll trip under normal operation. Less common but worth checking.
DIY Troubleshooting
What You Can Try
Stop resetting the breaker repeatedly
Every time the breaker trips and you reset it, the overcurrent condition stresses the system and the wiring. One or two resets to confirm the pattern is enough. Don't keep doing it.
Check the air filter and outdoor unit
Replace the filter if it's dirty. Check if the outdoor condenser coils are visibly clogged with dirt or debris. If you have a hose, gently rinse the coils from the inside out.
Let the system rest
Wait at least 30 minutes with the system off before trying once more. This lets the compressor pressure equalize, reducing the startup current. If it trips again immediately, stop trying.
Know When to Call
When to Call a Pro
If the breaker trips more than twice, call a technician. This is not a DIY fix. Electrical problems in AC systems can cause fires, and a grounded compressor or shorted wiring is dangerous. A tech will use an amp clamp to measure the current draw and pinpoint the cause.
Pro Tip
Never replace a tripping breaker with a higher-amp breaker to "solve" the problem. The breaker is sized to protect the wiring in your walls. A bigger breaker allows more current through wires that can't handle it — that's how electrical fires start.
More Troubleshooting