Top 6 Reasons Your Furnace May Not Be Turning On

  • There Is An Issue With Your Thermostat. …
  • There Is An Issue With Your Gas Line. …
  • Your Furnace Is The Problem. …
  • There Is Something Restricting Air Flow. …
  • You Need To Change Your Air Filters. …
  • You Have a Faulty Ignition Sensor (Pilot Light)

Why is my furnace not firing up?

If your gas furnace initiates the start cycle but does not fire up, it’s likely because of a faulty, damaged, or dirty ignitor/sensor. This is a very common furnace problem—you can try to clean the sensor and replace the ignitor.

Can hear your furnace click on but it does not fire up?

Most likely, your furnace is making a clicking noise and not providing heat because your furnace’s spark igniter is trying to ignite your pilot light or burners but is failing to do so. In other words, there’s an ignition system malfunction that needs to be fixed. Otherwise, your furnace won’t start.

Why does my furnace keep kicking in and out?

So, if your furnace keeps turning off and on too quickly, your thermostat might be malfunctioning or broken. There are several things that could be causing your thermostat to not work properly. The wiring could be old and need replacing, it might need new batteries, or it could be the location of your thermostat.

Why is my furnace dropping the flame?

Probably the most common issue when dealing with a furnace that will not stay lit or ignite consistently is a dirty flame sensor. The flame sensor acts as a communication vehicle with the circuit board and tells it when a flame is lit inside the furnace.

How do I get my furnace to ignite?


  1. Look for a switch inside or near the furnace that turns it on and off. Make sure that it’s set to on.
  2. Make sure the gas valve is turned on.
  3. Examine the circuit breaker for the furnace. …
  4. Check the pilot light. …
  5. Leave the setting for lighting the pilot on for a few minutes after getting it lit.

How do I clean my furnace ignitor sensor?

Quote from the video:
Quote from Youtube video: So if you have a situation like this what you have 90% of the time is just a dirty flame sensor. So we'll go through the steps on how to clean it. So the right side of the furnace.

How do you know if furnace ignitor is bad?

Here are a few indications that you have a faulty ignitor.

  1. No Cold Air. …
  2. The Furnace Won’t Come On. …
  3. The Furnace Suddenly Stops Blowing. …
  4. Starts, Then Stops, Then Starts Again. …
  5. Tripping the Breaker More Than Once. …
  6. I Hear the Click, But Nothing Happens. …
  7. Flame Sensor Problems. …
  8. Short Circuit.

How much does it cost to fix a furnace ignitor?

A ballpark figure is approximately $75 to $100. This cost covers only labor. At times, parts and services can go up to $250 to $300. Remember that your unit will not turn on if your furnace igniter malfunctions, despite having just replaced the part.

What does dropping the flame mean?

Definition of dropping fire

: a continuous desultory discharge of firearms.

What does it mean when a furnace is short cycling?

Short cycling is when the furnace turns on for a short period of time but then turns off. This start-and-stop cycle can keep your home from properly warming up and may also damage your furnace itself.

How long should it take for a furnace to ignite?

A furnace should take around five minutes to start once you’ve turned on your thermostat. That said, you might end up waiting closer to ten minutes to see your furnace kick on if it’s older or has an issue with its pilot light. If this is the case, it may need to be checked out by a professional.

What do I do if my pilot light won’t light?

If your pilot light won’t stay alight, it might be the thermocouple. Sometimes dust buildup collects on the thermocouple and blocks the sensor. Try cleaning the thermocouple and then relighting the pilot light. If it continues to go out, the thermocouple might need to be replaced.

Why is my furnace not responding to thermostat?

When a furnace is not responding to a thermostat, there is either a problem with the heating unit or the actual thermostat. Lack of power to the thermostat, wrong settings, and outdated software might be to blame, as well as faulty wiring, a tripped breaker, and a dirty furnace filter.

How do you manually reset a furnace?

How to Reset an Electric Furnace

  1. First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
  2. Locate the reset button on the furnace and press it to reset the furnace. …
  3. If the button is popped up, press it down.
  4. Return the cover to the blower compartment and turn the power on.

Why is my thermostat not turning the heat on?

If your heating system will not turn on, the first thing you should do is check the thermostat. The thermostat’s battery may have gone bad, causing it to power off. If your thermostat is hardwired, a power surge, brownout, or brief power outage may have caused the thermostat to lose its settings.

How do I know if my furnace fuse is blown?

Quote from the video:
Quote from Youtube video: So if the fuse is blown the heat won't work the air won't work the fan won't work.

How much does a furnace fuse cost?

The expense ranges from $30 to $300 for fuse replacement.

Does every furnace have a fuse?

Most newer furnaces, including gas furnaces, do have a fuse. What is this? Homeowners often wonder why their furnace needs its own fuse. Every furnace requires an electrical connection in order to run.