
Is your furnace failing to start? Learn about the potential culprits, from thermostat issues to ignition problems.
Check the Basics First
Before panicking, check the simplest solutions. Ensure your thermostat is set to "Heat" and the temperature is set higher than the current room temperature. Also, verify that the furnace switch (usually located on or near the unit) is turned on and the circuit breaker hasn't tripped.
Common Furnace Problems
- Dirty Air Filter: A clogged filter restricts airflow, causing the furnace to overheat and trigger a safety shutoff.
- Ignition Sensor Issues: A dirty or faulty flame sensor will prevent the gas valve from opening, stopping the furnace from igniting.
- Pilot Light Out: For older furnaces, the pilot light may have gone out.
- Gas Supply Issues: Ensure the gas valve is open and there are no interruptions to your gas supply.
Don't Freeze in the Cold
If you've checked the basics and your furnace still won't kick on, don't wait. Our 24/7 emergency repair team is ready to restore your home's comfort quickly and safely.
Related Articles

Why Is My Furnace Humming?
A humming furnace can be annoying and a sign of underlying issues. Find out what's causing the noise and how to fix it.

Why Is My Furnace Whistling?
That high-pitched whistling from your furnace usually means restricted airflow. We explain how to solve this common problem.

Is a Buzzing Furnace Dangerous?
Don't ignore a buzzing sound from your heating system. Learn what it means and whether it poses a safety risk.
