AC keeps tripping the breaker

Symptoms

• Breaker trips shortly after the AC starts
• May trip instantly or after running for a while
• Resetting doesn't hold for long

Likely causes

• CommonFailing compressor drawing excess currentA compressor nearing failure can pull far more current than normal, tripping the breaker.
• CommonFailing capacitor causing hard startsA weak capacitor makes the compressor or fan motor struggle to start, spiking current draw.
• PossibleShort circuit in the outdoor unit's wiringWeather exposure and age can degrade wiring insulation, causing a direct short.
• PossibleDirty condenser coil causing the compressor to overworkA coil that can't release heat properly forces the compressor to work harder and draw more current.
• Less commonWorn breakerBreakers can weaken with age and trip below their rated load.

What to do

1. Reset the breaker once; if it trips again immediately, turn the AC off at the thermostat and leave the breaker off.
2. Check the outdoor condenser coil for heavy dirt or debris buildup and clean it gently with the power off if accessible.
3. Don't reset the breaker repeatedly, since this risks further component damage or a fire hazard.
4. Note whether it trips right at startup or after running a while, which helps a technician diagnose faster.
5. Call an HVAC technician or electrician to test the compressor, capacitor, and wiring.

Tools and parts

• Garden hose

When to call a pro

Call an HVAC technician if the breaker trips more than once; this usually points to a compressor, capacitor, or wiring fault needing proper diagnosis.

Safety