Furnace Not Turning On

Furnace Not Turning On in Thunder Bay, Ontario

Common Causes, What to Check, and When to Call for Repair

When your furnace won’t turn on, indoor temperatures can drop quickly—especially during Northwestern Ontario winters. A heating system that fails to start is more than an inconvenience; it can become a safety concern. Homeowners in Thunder Bay often experience this issue during cold snaps when furnaces are working their hardest.

Understanding why a furnace won’t start helps determine whether it’s a simple fix or a situation that requires immediate professional repair.

Why Won’t My Furnace Turn On?

A furnace that won’t start usually means a safety control, electrical component, or fuel supply issue is preventing operation. Common causes include:

Thermostat Problems

Incorrect settings, dead batteries, or faulty wiring can stop the furnace from receiving a heat call.

Tripped Breaker or Power Issue

Furnaces require electricity to operate, even gas systems. A tripped breaker or blown fuse can shut the system down entirely.

Dirty Air Filter

Restricted airflow can trigger safety shutdowns to prevent overheating.

Ignition or Pilot Light Failure

Modern furnaces rely on electronic ignition systems. Older units may have pilot lights that can go out or fail to stay lit.

Faulty Safety Switches

Door switches, pressure switches, and limit switches prevent the furnace from operating if unsafe conditions are detected.

Gas Supply Issues

Closed gas valves or supply interruptions will prevent a gas furnace from starting.

What You Can Safely Check Before Calling for Service

Homeowners in Thunder Bay can perform a few basic checks before calling for furnace repair:

• Confirm the thermostat is set to heat and the temperature is raised

• Replace thermostat batteries if applicable

• Check the electrical breaker or fuse

• Replace a dirty air filter

• Ensure the furnace access panel is securely in place

• Confirm the gas valve is open

If the furnace still won’t turn on after these steps, professional service is recommended.

When a Furnace Not Turning On Is an Emergency

You should call for emergency furnace repair in Thunder Bay if:

• Outdoor temperatures are near or below freezing

• There is no heat at all in the home

• You smell gas or burning odors

• The furnace repeatedly attempts to start and shuts down

• Seniors, children, or pets are in the home

Extended loss of heat can lead to frozen pipes, property damage, and unsafe living conditions.

Common Furnace Components That Prevent Startup

Several internal components can stop a furnace from turning on, including:

• Igniters

• Flame sensors

• Control boards

• Pressure switches

• Blower motors

These parts require proper diagnostics and licensed repair to restore safe operation.

Furnace Not Turning On: Repair or Replacement?

Repair is usually the best option when:

• The furnace is under 15 years old

• The issue involves a replaceable component

• The system has been otherwise reliable

Replacement may be considered if:

• The furnace is 20+ years old

• Major components fail

• Breakdowns are frequent

• Heating efficiency has declined significantly

A professional evaluation helps determine the most cost-effective solution.

Preventing Future Furnace Startup Problems

To reduce the risk of your furnace failing to start:

• Replace air filters regularly

• Schedule annual heating maintenance

• Address minor issues early

• Keep vents and returns unobstructed

Preventative care improves reliability during extreme winter conditions.

Furnace Not Turning On in Thunder Bay? Help Is Available

A furnace that won’t start is never something to ignore—especially during a Northwestern Ontario winter. Professional furnace repair ensures your heating system operates safely and reliably when you need it most.

If your furnace is not turning on in Thunder Bay, early diagnosis can prevent emergencies and costly damage.

FAQ: Furnace Won’t Turn On

Why does my furnace click but not start?

This often indicates an ignition or safety switch issue that requires professional repair.

Should I reset my furnace repeatedly?

No. Repeated resets can cause additional damage and mask underlying problems.

Can a dirty filter stop a furnace from turning on?

Yes. Restricted airflow can trigger safety shutdowns.

How fast can furnace startup issues be fixed?

Many startup problems can be repaired the same day, depending on parts availability.

Contact Us:
Phone: +1 (807) 698-8009

Email: info@blenheimheatingandcooling.com