When your furnace stops heating properly, it can be uncomfortable and concerning—especially during Bel Air's cooler winter nights. Before you call for service, here are some common causes and what you can check yourself.
Common Causes of Furnace Heating Problems
1. Thermostat Issues
Sometimes the simplest explanation is the right one. Check that your thermostat is set to "heat" mode and the temperature is set higher than the current room temperature. Also, check if the batteries need replacing—low batteries can cause erratic behavior.
2. Dirty or Clogged Filter
A dirty air filter is one of the most common causes of heating problems. When the filter is clogged, it restricts airflow, causing the furnace to overheat and shut down as a safety measure. Check your filter and replace it if it looks dirty.
3. Pilot Light or Ignitor Problems
If you have an older furnace with a pilot light, check if it's lit. For newer furnaces with electronic ignition, a failing ignitor can prevent the furnace from starting. This typically requires professional repair.
4. Gas Supply Issues
Ensure your gas valve is open and other gas appliances in your home are working. If you smell gas, leave immediately and call your gas company.
5. Circuit Breaker Tripped
Check your electrical panel for a tripped breaker. Sometimes power surges can trip the furnace circuit.
When to Call a Professional
While some issues can be DIY fixes, others require professional attention:
- You smell gas or suspect a gas leak
- The furnace won't ignite
- Strange noises coming from the unit
- Yellow or flickering pilot light
- Furnace cycles on and off frequently
Our Bel Air technicians are available 24/7 for heating emergencies. We'll diagnose the problem and provide upfront pricing before any repairs.