Repair Icon

Furnace Repair

Worried your furnace isn't performing as it should?
Sterling technician repairing furnace

We service and repair nearly all major furnace brands.

If this is an emergency, call us immediately. If you know the repair you need, book an appointment with us. Otherwise, keep reading below to learn more about troubleshooting your furnace issues.

Book a Consultation or Diagnostic
Sterling team member

Troubleshooting your furnace.

Here are a few issues furnace owners frequently encounter and the usual reasons for why they're happening.

Common furnace issues and their causes

Heating Icon

Low heat/no heat

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
On/Off Switch Icon

Frequent on/off cycling

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Refrigerant leaks
  • Faulty compressor
  • Limit switch failure
Fan Icon

Blower running more frequently than usual or continuously

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Refrigerant leaks
  • Faulty compressor
  • Limit switch failure
Noises Icon

Rumbling, rattling, or squeaking

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Mechanical issues
  • Airflow reduction
  • Clogged burner
  • Other mechanical issues
Temps Icon

Inconsistent temperature

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Refrigerant leaks
  • Faulty compressor
  • Dirty or clogged air filters
Pilot Out Icon

Pilot light going out

  • Thermostat malfunction
  • Malfunctioning pilot light
  • Underpowered unit
  • Gas line issue
  • Excessive drafts
  • Thermocouple malfunction
  • Faulty ignition or pilot
  • Airflow issues

Book an in-home diagnostic

Sterling team member

For a custom solution to your home, book a call with one of our experts to recommend the best approach for you and your home.

Book a Diagnostic

Repairs and Servicing

Ready for winter? In Canada, it's important to make sure your home is ready for the extreme wind, snow, ice and sub-zero temperatures our winters can bring. Staying comfortable during the cold months starts with having the right heating system that runs smoothly and efficiently all season long.

Technician with a single stage furnace

We carry, install, and service all major makes and models.

Stuff Icon

Hear from our customers

Still have questions?

Sterling team member

Book a Consultation

We have HVAC systems experts available that would be happy to share their knowledge, answer questions, and suggest solutions for Furnaces, Water Heaters, and A/C.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Sterling technician changes air filter

Say goodbye to furnace worries with SterlingCare plans as low as $9.99.

Take back control and enjoy peace of mind with a SterlingCare Maintenance Plan.