Why Won't a Furnace Turn On?

Issues with a furnace may seem simple, but the problem will be noticeable when the temperature drops and the system is most needed

Issues with a furnace may seem simple, but the problem will be noticeable when the temperature drops and the system is most needed. At that moment, identifying and fixing the issue must be quick and efficient.

Here are some common reasons a furnace is not turning on or working correctly:

Airflow restriction

When something blocks the air ducts, it may cause the furnace to work in some parts of the house and not others. A clear indication of a blockage in the ductwork is cold and hot spots in different areas around the property.

In these cases, the ductwork needs to be inspected for any blockage. A furnace repair expert can efficiently verify the ductwork's condition, locate the problem, and unblock it.

Furnace problems

Even gas furnaces use electricity to function. Occasionally, the furnace won't turn on due to an electrical problem. Contact a professional if the switch next to the furnace is in the on position, but the system doesn't turn on. A qualified technician will check the circuit breaker and solve any problem with the electrical installation of the furnace system.

Air filter issues

Furnace filters need to be clean to function correctly, as dirty filters will block the airflow. Contact a furnace repair company to properly assess the filter's condition and replace it if necessary.

Faulty ignition sensor

When the ignition sensor is not working correctly, the furnace will click on but not fire up. This is one of the common reasons a furnace won't turn on. In some cases, it could be accumulated dirt and grime on the sensor that causes the malfunction. A professional furnace repair company can efficiently clean or replace the ignition sensor.

Gas line issue

Issues with the furnace are the most significant risk hazards. If every other gas appliance works correctly except for the furnace system, it could be because of a blockage in the gas line. The odor of gas around the furnace indicates a gas leak, which requires a professional to be called immediately.

Thermostat issue

The ambiance will not reach the set temperature when there is an issue with the furnace system thermostat. Make sure to contact a furnace repair company to check the condition of the thermostat and change it if needed.

Let's keep the heat on!

When the temperature drops and homeowners ignite their furnace systems, they may realize it's not turning on or working correctly. Contact a furnace repair company to make a complete assessment of the system and check the electrical panel.


Evenflow Home and Commercial Services of San Antonio offers impeccable house cleaning services, professional plumbing, electrician services, HVAC installation, maintenance, and repair. Our technicians offer 24-hour emergency electrical and HVAC service for San Antonio, Schertz, Converse, Floresville, Elmendorf, and more. Call us at (210)941-3503.

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