Furnace Ignites Then Turns Off

Furnace Ignites Then Turns Off. For people who own homes, the idea of turning the heat on just to have it turned off is downright horrifying. When the furnace has a hot surface but is not heating your home, this is exceptionally frustrating.

Furthermore, not only is this inconvenient but it can also be dangerous if you are unable to get the heat to work. What happens if the furnace turns on, circulates warm air, and then turns off before the room is sufficiently heated?

Here are some additional possible reasons for your furnace’s brief cycle.

  • Airflow is low
  • The Control board is malfunctioning
  • Thermostat is faulty
  • Flame rollout button
  • Defective pressure switch
  • Dirty flame sensor

In all instances, it is critical that you do not allow anybody who is not a skilled professional to operate your furnace or heating system.

Furnace Ignites Then Turns Off
why furnace ignites then turns off

If your furnace appears to be working well when switched on, but later stops, look into the following:

Air Flow is low

Poor ventilation is a common cause of furnace problems. If your furnace is in a closet or a small area, it may not be able to work properly.

To work effectively, air must flow everywhere around it, including above and below. In many situations, the problem can be solved by moving the furnace to a better position.

Control Board is malfunctioning

The control board is an essential component of every furnace. It is in charge of controlling the electricity delivered to the furnace’s various components.

A malfunctioning control board might be the cause of the furnace only running for a short time.

Thermostat is faulty

The basic purpose of the thermostat is to manage the temperature and heating system inside the furnace.

If you are facing the issue of furnace ignites then turning off after sometimes then there is a chance that the thermostat of the furnace is defective, and you will have to replace it by hiring an expert.

Flame rollout buttonflame rollout switch

The burners’ heat is monitored by the flame rollout switch. To open the flue and discharge the heat, air must flow to the burners.

In the event that this does not occur.

The flame rollout switch will turn off the furnace to prevent it from becoming excessively hot.

Defective pressure Switchpressure switch

Another possibility is that a broken pressure switch is causing the furnace to go off.

The flow of air to the spark plug causes the switch to become active. In other words, the furnace will stop working if there is not enough airflow.

Draft inducer motor

Through the burner, the drafting inducer motor pulls air into the furnace.

The pressure switch reacts and alerts the control board when this occurs.draft inducer motor

Air won’t get into the furnace if the motor isn’t working properly.

Dirty flame sensor

Another factor that might cause a furnace to ignite and then turn off is the flame sensor.

When the flame is on, this important component detects it.flame sensor

The control board is then notified to start blowing heated air.

The sensor is frequently covered with dust or debris, and if this happens, the sensor will fail to detect the flame, and the furnace will shut off.

Check Your Furnace with the Experts

As you know that the majority of these difficulties need the assistance of a qualified specialist. Only a skilled expert can track down the issue, diagnose the source, and repair or replace a component.

In fact, the best approach to avoid serious problems with your HVAC system is to have a regular maintenance plan in mind.

A technician can detect small faults before they become costly ones by inspecting the system at regular intervals.


If your furnace starts then turns off, and you aren’t feeling comfortable, call your electrician. Maintaining the comfort of your family is dependent on the efficiency of your furnace.

Any work on the furnace should be done by an HVAC expert who has been trained to recognize how it works.

It’s not only about comfort; it’s also about safety. If you haven’t had a furnace check-up in a while, follow the above suggestions to know the basic problems and wait till you can find an HVAC expert who gives it a once-over to ensure you won’t be left in the cold when you need it most.

Furnace Ignites Then Turns Off

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