Furnace not turning on? Find your answer here!

furnace not turning on

Furnace not turning on? Here’s what may be going on. Many homeowners have questions about why their furnace is not turning on. There are a number of different reasons that a furnace might not turn on. In order to determine the cause, it is helpful to use an online troubleshooting guide.

Having heating issues with your furnace? You are not alone. It can be frustrating when your furnace isn’t firing up or it takes forever for it to heat up your home. Check out this blog post to find the reasons why your furnace isn’t working and what you can do to fix it.

If your furnace is not turning on and you’re not sure what the issue is, we’ve got your back! If your furnace is not responding and there’s no buzzing sound, then you may need to replace the circuit board. You’ll need to remove the back of the furnace and locate the circuit board. Test the circuit board to see if it’s faulty. If it is, you’ll need to replace it!

Furnace not turning on? Find your answer here!

Furnace clicks but doesn’t turn on

Furnace not turning on? Find your answer here!

If the furnace clicks but doesn’t turn on, there is a problem with the thermostat, a blown circuit or a malfunctioning pilot light.

-If the thermostat is set below the room temperature, your heating system won’t turn on.

-If the thermostat is set above the room temperature, the heating system will turn on and stay on as long as the thermostat is on.

-Anything that could interrupt power to your furnace, such as a dead short or a power outage, can cause an unresponsive furnace.

-If the pilot light is out, the furnace will not turn on.

The furnace does not work at all

-One possible problem is a lack of power to it. Your furnace required enough power to operate and so the fuse may have blown and needs to be switched and in this case, the breaker in your fusebox may need to be switched off and on again or your power company may need to be called

-One common cause is that the fan that blows the air around in the furnace has stopped spinning. This can happen if a bird (or other critter) has built a nest in the chimney and created a blockage. This blockage means the fan is not working and your furnace is not turning on

-The coil of metal wire in the furnace that heats up is powered by electricity and when it gets hot enough, it heats 

The furnace does turn on, but makes no heat

It is strange that your furnace doesn’t turn on, but you do feel hot air. Unfortunately, this is not the case. The furnace does turn on, but does not make heat. If you have no heat or have hot air at the vents, the following are the possible explanations for this

Blocked air vents (especially the smaller ones that are closer to the kitchen/dining area)

Wrong size or insufficient number of air filters

Air filters need to be replaced

Wrong size or insufficient number of heating units

The pilots are not lit

The furnace is not producing enough heat (probably because it’s too cold outside)

A switch or breaker has failed

The fan may be broken or jammed

The thermostat might be broken

The furnace doesn’t turn on and has no power?

Make sure the thermostat is set to “Heat”. The furnace doesn’t have power if the thermostat is set to cool or is off. Confirm the thermostat is set to “Heat” and is receiving power. If power is to the thermostat and the furnace still is not turning on, there may be a problem with the motor or the safety switch.

The furnace not turning on can be checked by confirming the thermostat is set to “Heat” and has power. If the thermostat does not have power, there is no need to turn on the furnace. The furnace also should not turn on if the thermostat is set to cool. If the thermostat is set to cool, check the cool thermostat wire for power.

The furnace won’t turn on automatically

Put your head into the furnace, and see if the pilot light is lit. If it is, pull off the bulb. The pilot light might be lit, but the flame will not be lit up over 30 seconds.

Check the circuit breaker to see if it was tripped. If you don’t recognize the circuit breaker panel, call an electrician.

If you find any loose wires, find an electrician.

Re-light the furnace by relighting the pilot light.

Finally, don’t forget to change the filter!


1. Check for a tripped thermal fuse 

2. Check for a tripped low voltage relay 

3. Check for a tripped condensate overflow switch 

4. Check for a tripped burner high limit switch 

5. Check for a tripped limit switch on the air circulating fan 

6. Check for a tripped water flow switch 

7. Check for a tripped power outage 

8. Check for a tripped circuit breaker 

9. Check for a tripped 240-volt power cord 

Frequently asked questions about a furnace not turning on 

I turn the thermostat to the heat setting but it doesn’t come on?

Oftentimes, it is the heating element at the furnace which you will want to look at first.

I have a lot of the furnace running noise but it’s not turning on?

The fan can be making a lot of noise for a variety of different reasons, so be sure to have it looked at before spending too much time trying to fix it.