When the heating system stops working, especially during a chilly Philadelphia winter, it’s easy to feel panicked. But before you pick up the phone to call a professional, there are a few simple troubleshooting steps you can take to potentially fix the problem yourself. Here’s a checklist of what to do when your heating system fails.

1. Check the Thermostat Settings

  • The Issue: Sometimes, the thermostat may have been accidentally set to the wrong mode or temperature.
  • What to Do: Make sure the thermostat is set to "Heat" and the temperature is set higher than the current room temperature. If you have a programmable thermostat, double-check the schedule settings. Also, check if the batteries need replacing.

2. Inspect the Circuit Breaker

  • The Issue: A tripped circuit breaker could cut power to your heating system.
  • What to Do: Locate your home’s electrical panel and check if the breaker that controls your furnace or HVAC system has tripped. If it has, reset the breaker by flipping it off and then back on. If it trips again, it could indicate an electrical issue that needs professional attention.

3. Replace or Clean Air Filters

  • The Issue: Dirty or clogged air filters can block airflow, causing your system to overheat and shut down as a safety measure.
  • What to Do: Check your air filters and replace them if they’re dirty or clogged. A good rule of thumb is to change filters every 1-3 months, especially during heavy use in the winter. Clean filters improve airflow and overall system efficiency.

4. Ensure Vents and Registers Are Open

  • The Issue: Blocked or closed vents can disrupt the heating process by restricting airflow.
  • What to Do: Walk through your home and check that all supply and return vents are open and unobstructed by furniture, curtains, or rugs. Even one blocked vent can affect your system’s ability to heat the home properly.

5. Check the Pilot Light or Ignitor

  • The Issue: For gas furnaces, the pilot light or ignitor may be out, preventing the furnace from heating.
  • What to Do: If you have an older system with a pilot light, check to see if it’s out. If so, follow your furnace’s instructions to relight it. For newer systems with an electronic ignitor, listen for a clicking sound. If the ignitor is faulty, it may need to be replaced by a professional.

6. Look for Error Codes on the Furnace

  • The Issue: Modern HVAC systems often display error codes to indicate specific problems.
  • What to Do: Check the control panel on your furnace for any blinking lights or error codes. Refer to your system’s user manual to identify what the code means and whether it’s something you can fix or if professional help is required.

7. Check the Fuel Supply (For Gas or Oil Systems)

  • The Issue: Your system may not be getting the fuel it needs to operate.
  • What to Do: For gas furnaces, ensure the gas supply is on by checking the gas valve. If you have an oil system, verify that there’s enough fuel in the tank. Sometimes, running out of fuel can prevent the system from starting.

8. Inspect the Outdoor Unit (For Heat Pumps)

  • The Issue: If you use a heat pump, debris or ice on the outdoor unit can prevent it from working correctly.
  • What to Do: Check the outdoor unit to make sure it's free from ice, snow, or debris that could block airflow. Gently clear away any obstructions and ensure the unit has at least two feet of clearance around it.

9. Reset the System

  • The Issue: Minor system glitches can sometimes be resolved with a simple reset.
  • What to Do: Turn off your heating system at the thermostat and the breaker. Wait a few minutes, then turn it back on. This can sometimes clear minor errors or resets after power outages.

When to Call a Professional

If you’ve gone through this checklist and your heating system still isn’t working, it’s time to call a professional HVAC technician. Persistent problems like faulty wiring, blower motor issues, or refrigerant leaks (in heat pumps) require expert handling. McCorry Comfort, a trusted HVAC service in the Philadelphia area, can help diagnose and repair any issues to get your system back up and running quickly.

Final Thoughts

No one likes dealing with a malfunctioning heating system, especially in the middle of winter. By following these simple troubleshooting steps, you might be able to resolve the issue without needing a repair visit. However, if the problem persists, don’t hesitate to call in the experts to ensure your home stays warm and comfortable all season long.