Why does my AC trip the breaker when it's really hot?

Your AC is likely tripping the breaker due to electrical overload caused by the system working harder in extreme heat. This is a common issue during Ottawa's hottest summer days when your air conditioner struggles to keep up with cooling demand.

When outdoor temperatures soar above 30°C, your AC's compressor works much harder to move heat from inside your home to the already-hot outdoor air. This increased workload draws more electrical current, and if your system is already stressed from dirty coils, low refrigerant, or aging components, it can exceed the breaker's capacity and trip for safety.

Dirty condenser coils are often the primary culprit. When the outdoor unit's coils are clogged with dirt, grass clippings, or cottonwood fluff (common in Ottawa), heat can't escape efficiently. This forces the compressor to work overtime, drawing excessive power. A failing compressor that's nearing the end of its life will also draw more current as internal components wear out. Additionally, low refrigerant levels from leaks make the system work harder to achieve the same cooling effect.

In Ottawa's climate, this problem typically surfaces during heat waves when daytime temperatures exceed 32°C for several consecutive days. Your 15-20 amp AC circuit breaker is designed to protect your home's electrical system, so repeated tripping indicates a real problem that needs attention.

Safety is critical here - never bypass or upgrade the breaker without professional assessment, as this could create a fire hazard. Turn off your AC system and check that the outdoor unit's coils are clean and free of debris. If the problem persists after cleaning, you'll need a licensed HVAC technician to diagnose whether it's a refrigerant issue, failing compressor, or electrical problem.

For a thorough diagnosis of your AC's electrical issues, request a quote from Ottawa HVAC Pro - we can identify the root cause and prevent damage to your system.