A reliable furnace is essential for maintaining a warm and comfortable home in Colorado. However, if your furnace won’t turn on, it’s not just an inconvenience—it can become frustrating and stressful.
This video will help you understand the common reasons a furnace might not start. The following furnace troubleshooting guide expands on these reasons, explains how to address these issues, and the importance of regular maintenance to avoid problems in the first place. If you have a furnace emergency, call the Denver heating experts at Applewood for fast repair service.
The Importance of Checking Your Furnace Early
Don’t wait until the first cold snap to discover your furnace isn’t working. Testing your system early in the season allows you to catch and address any issues before you truly need the heat. Plus, early checks give you time to schedule repairs if necessary, avoiding the busy season when technicians are in high demand.
8 Common Reasons Your Furnace Won’t Start—and How to Fix Them
Below is a checklist of common furnace issues and the steps you can take to address them.
- Dirty Air Filters
- Cause: Clogged air filters restrict airflow, causing the furnace to overheat and shut down.
- Solution:
- Replace the air filter if it looks dirty or clogged.
- Schedule regular filter changes every 1-3 months, depending on your usage.
- Power Problems
- Cause: Tripped circuit breaker, loose wiring, or a blown fuse.
- Solution:
- Check your circuit breaker panel and reset any tripped breakers.
- Inspect the furnace’s power switch (usually located nearby) to ensure it’s in the “On” position.
- Call an electrician if there is no power to your furnace and you suspect a wiring issue.
- Pilot Light or Ignition Problems
- Cause: A faulty pilot light, thermocouple, or electronic ignition system.
- Solution:
- For gas furnaces, check if the pilot light is out and relight it following the manufacturer’s instructions.
- Inspect the thermocouple and replace it if it’s worn out.
- For newer furnaces with electronic ignition, reset the system as directed in the user manual.
- Thermostat Issues
- Cause: Dead batteries, incorrect settings, or a malfunctioning thermostat.
- Solution:
- Replace the thermostat batteries.
- Ensure the thermostat is set to “Heat” and the temperature is higher than the current room temperature.
- Check for loose or frayed wires.
- If it’s still unresponsive, consider replacing the thermostat.
- Gas Supply Issues
- Cause: Disrupted or turned-off gas supply.
- Solution:
- Check that the gas valve is open.
- Inspect other gas appliances to confirm if the issue is system-wide.
- Contact your gas company or a professional technician if the problem persists.
- Blocked Vents or Flues
- Cause: Debris, snow, or birds’ nests blocking the exhaust vents.
- Solution:
- Inspect and clear any obstructions from the furnace’s venting system.
- Ensure the area around the furnace and its flue is free of clutter.
- Blower Motor Issues
- Cause: If the furnace fan won’t turn on, the blower motor may be jammed, dirty, or burned out.
- Solution:
- Listen for unusual noises like grinding or squealing.
- Turn off the power to the furnace and check for obstructions around the blower.
- Call a professional to inspect or replace the motor if necessary.
- Dirty or Faulty Sensors
- Cause: Dust and grime on flame sensors can cause the furnace to shut off prematurely.
- Solution:
- Turn off the furnace, remove the flame sensor, and clean it with fine sandpaper.
- If cleaning doesn’t help, replace the sensor.
The Importance of Regular Furnace Maintenance
Annual furnace maintenance can prevent most issues before they start. Here’s why it’s worth servicing your heating system:
- Improved Efficiency: Clean and well-maintained systems use less energy.
- Fewer Breakdowns: Regular inspections help catch small problems before they become major repairs.
- Extended Lifespan: A well-maintained furnace lasts longer, saving you money in the long run.
- Better Air Quality: Clean filters and components reduce dust and allergens in your home.
Additional Considerations for Furnace Care
- Inspect Ductwork: Leaks or blockages in your duct system can reduce your furnace’s efficiency.
- Check Carbon Monoxide Detectors: Ensure your CO detectors are functioning properly to protect your family from gas leaks.
- Upgrade If Necessary: If your furnace is over 15 years old and repairs are becoming frequent, it might be time for a replacement.
With Applewood, Your Furnace Will Turn On
Applewood’s licensed HVAC technicians are available daily from 6 AM to 10 PM to diagnose and fix your heating problems. We also offer regular maintenance services to keep your furnace running smoothly all winter long. No matter your needs, you can expect fast and comprehensive service.
Use the “Book Now” button or call to schedule a furnace inspection or repair service and ensure your home stays warm and cozy this season!
