Furnace Not Igniting
Furnace trying to start but won't ignite? This is a common issue with several possible causes.
Need immediate help? Our technicians are available 24/7.
Call Now: (650) 397-7060Common Symptoms
If you're experiencing any of these symptoms, you may have this problem:
Possible Causes & Solutions
Dirty Flame Sensor
Pro RequiredProfessional cleaning of flame sensor
Failed Ignitor
Pro RequiredIgnitor replacement required
Gas Valve Issues
Pro RequiredProfessional inspection and repair
Thermocouple Problems
Pro RequiredThermocouple adjustment or replacement
Control Board Failure
Pro RequiredProfessional diagnosis and board replacement
When to Call a Professional
While some issues have DIY solutions, HVAC systems are complex. Call a professional when:
- DIY solutions don't resolve the problem
- The issue involves electrical components
- You smell gas or burning odors
- The problem returns after temporary fixes
- Your system is under warranty (DIY repairs may void it)
Frequently Asked Questions
Why won't my furnace turn on?
Common causes include a tripped circuit breaker, thermostat issues, pilot light problems, or a faulty ignition system. We can diagnose all furnace issues.
My furnace is making strange noises. What does it mean?
Different noises indicate different issues: banging may mean delayed ignition, squealing could be a belt issue, and rumbling might indicate a burner problem.
How often should I change my furnace filter?
Standard filters should be changed every 1-3 months depending on usage, pets, and allergies. Higher-quality filters may last longer but check monthly.
Is a cracked heat exchanger dangerous?
Yes, a cracked heat exchanger can leak carbon monoxide, which is dangerous. If suspected, turn off your furnace immediately and call for service.