It can be disappointing to return home on a chilly day only to find your furnace not turning on. Furthermore, this may happen late at night, leaving you with indoor discomfort as you wait to schedule repairs. More importantly, note that trying to diagnose your unit for defects can result in more issues, and it is best to wait for a furnace repair expert to attend to the problem. They will inspect your heating unit and remedy the underlying malfunction for peak performance. Read the reasons below to learn why your furnace won't turn on. 

Tripped Circuit Breaker

A power outage or surge in your circuitry can trigger your circuit breaker, causing your system to shut off. On the other hand, normal wear and tear can bring wires into contact, leading to an unintended electric flow. As a result, a short circuit will trip the circuit breaker, rendering your system inoperable. If this is the case, you must contact an HVAC expert instead of resetting the breaker. They will replace the worn-out components and install a whole-house surge protector for proper current flow.

Thermostat Issues

If your thermostat lacks a wired power source, the batteries powering it could be dead. As such, the thermostat cannot send signals to the furnace control board to run heating cycles. Alternatively, the wrong thermostat settings can lead to the wrong function. For instance, setting a temperature lower than the room temperature will not turn on the furnace. Moreover, your thermostat will display an error code if it malfunctions and render your system inoperable. Therefore, you should hire a heating contractor to replace your thermostat's batteries for proper climate control. They will also assist you in programming your temperature settings for seamless operation.

Restricted Airflow

Furnace filters trap dust, dirt, pollen, pet dander, and debris from the air. Consequently, these filters may clog with airborne contaminants with continued use, restricting airflow. As a result, the heating exchanger will overheat, causing it to crack and shut down the furnace. Thus, it is wise to clean your air filters regularly or replace them, if disposable, with identical filters for proper airflow.

Faulty Flame Sensor

When dirt and soot infiltrate the ignition sensor, they may cause it to malfunction. This results in the production of a weak flame that is easily extinguishable, leading to the furnace shutting down. Therefore, you should employ the services of a heating unit repair expert to clean the flame sensor for proper furnace ignition.

A furnace that is not turning on will compromise your indoor comfort. Thus, you should schedule service checks with a furnace repair expert to ensure your system is in good working order.

Contact a local HVAC service to learn more about furnace repair