If your gas furnace won’t turn on, it can be both frustrating and uncomfortable, especially as temperatures drop. Before jumping to conclusions or calling a technician, there are some troubleshooting steps you can try to identify and perhaps even fix the problem.
Here’s a quick guide on what to check when your furnace is giving you trouble.
Check the Thermostat Settings
One of the most common reasons a furnace doesn’t turn on is simply because of incorrect thermostat settings. Make sure your thermostat is set to “Heat” and that the temperature is set higher than the current room temperature. If your thermostat is battery-operated, check to see if the batteries need replacing. Dead batteries can sometimes prevent the thermostat from communicating with the furnace.
Inspect the Power Supply
If your thermostat is set correctly but the furnace still won’t turn on, you may have an issue with the power supply. Even gas furnaces rely on electricity for ignition, so if the power is out or there’s an issue with your circuit breaker, the furnace won’t operate. Check the breaker panel to see if any switches have tripped. If the circuit for the furnace has been flipped, try resetting it. Additionally, check for any loose or disconnected power cords.
Examine the Pilot Light or Ignition System
Gas furnaces either have a standing pilot light or an electronic ignition system to start heating. If your furnace has a pilot light, ensure it is lit. If it’s not, follow the manufacturer’s instructions for relighting it. If it doesn’t stay lit, this could indicate a problem with the flame sensor, which would require a technician’s assistance. For furnaces with an electronic ignition, ensure the system is receiving power. A malfunction in the ignition system will require professional repair.
Check the Gas Supply
Another potential reason for your furnace not turning on could be a disruption in the gas supply. Confirm that your gas valve is open and supplying fuel to the furnace. You should also check for any signs of a gas leak, such as a rotten egg smell, which indicates an immediate need for professional assistance. If you suspect a gas leak, turn off your furnace, exit your home, and call your gas provider right away.
Clean or Replace the Air Filter
A clogged air filter can prevent your furnace from turning on. When the filter is too dirty, it restricts airflow, causing the system to overheat and shut down as a safety measure. Make it a habit to check and replace the air filter every one to three months, especially during peak heating season. Keeping a clean filter not only ensures your furnace runs smoothly but also improves indoor air quality.
Call in a Professional
If you’ve gone through these troubleshooting steps and still can’t get your furnace to start, it may be time to call in an expert. Issues with components like the blower motor, heat exchanger, or control board are best handled by a qualified technician. If you’re looking for furnace repair in Centreville, VA, a professional can assess and resolve the issue quickly and safely.
Call B&B Air Conditioning & Heating Service… We are always there when you need us.