Why does my furnace keep tripping the breaker?

A furnace that repeatedly trips the breaker typically indicates an electrical overload, often caused by a failing blower motor, dirty air filter, or electrical component malfunction. This is a safety issue that requires immediate attention from a licensed HVAC technician.

The most common culprit is a struggling blower motor that's drawing too much current. When your furnace's air filter becomes severely clogged, the blower motor has to work much harder to push air through the system, causing it to overheat and draw excessive power. Over time, this extra strain can damage the motor's windings, leading to electrical shorts that trip your breaker. A dirty or blocked air filter should be your first check - replace it immediately if it's visibly dirty or hasn't been changed in over 3 months.

Electrical component failures can also cause breaker trips. The furnace's control board, capacitors, or wiring connections may be faulty, creating dangerous electrical conditions. In Ottawa's climate, furnaces work hard during our cold winters, and components can wear out faster. Additionally, older homes may have undersized electrical circuits that can't handle modern high-efficiency furnace demands.

Safety is critical here - a tripping breaker is your electrical system protecting you from potential fire hazards or electrocution. Never attempt to "solve" this by installing a larger breaker, as this removes important safety protection. Turn off your furnace at the thermostat and electrical panel until a licensed technician can diagnose the issue.

For Ottawa homeowners, furnace electrical repairs typically range from $200-600 depending on the component involved. Blower motor replacement can cost $400-800, while simple fixes like capacitor replacement might only be $150-250. Given our harsh winters, it's essential to address this immediately to avoid being without heat. Contact a TSSA-licensed HVAC technician for safe diagnosis and repair of your furnace's electrical system.

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