What to Do When Your Furnace Won’t Turn On

The warm air that your furnace provides is vital to keeping your house cozy during the winter season. Without it, your home will be extremely uncomfortable to live in, especially if you live in a cold region. 

However, what happens if your furnace won’t turn on? Should you hire an HVAC technician right away? Perhaps your furnace is broken and you need to buy a new one.  

Before you make a drastic decision, there are a couple of things you should try to do first. If none of these solutions work, then you might have to hire a furnace installation Bridgeport company for help. 

Faulty Electronics 

It does not matter what type of furnace you’re using. Your unit is probably using circuitry to switch it on and off. This means almost all modern furnaces utilize circuit breakers as a safety feature for the ignition system.  

These electronic systems can still become faulty. Perhaps the circuit breaker in your house has tripped. If that’s the case, you only need to replace the circuitry of your furnace.  

Clogged Air Filter 

One vital component of your furnace is the air filter. If it becomes clogged or gets dirty, it can affect the operation of your furnace. The truth is that it might also be the reason why your furnace won’t turn on.  

Try to check the air filter of your furnace to see if it’s clogged. If that’s the case, you need to replace the air filter. This task is quite easy to do.  

Damaged Furnace Control Board 

Another vital component of your furnace is the control board. It is responsible for the overall mechanics of your furnace. The control board is in charge of what activates when, which parts work in harmony with which, and how to safely control temperature.  

Whenever the control board gets damaged, your furnace will not work properly. Thus, you should check if there is loose wiring, a broken button, or an accumulation of dirt on the control board that prevents the furnace from turning on. 

Issues with the Gas Flow 

If you’re using a gas furnace, it will require fuel to activate. If gas is not reaching the unit, then it will not turn on.  

Keep in mind that this issue is best solved with the help of a professional. This is particularly true if you don’t know how to access the gas chamber of your furnace.  

Still, you can do the job on your own if you simply want to check whether your furnace has leaks, cracks, or blockages in any visible gas pipes.  


When you install your thermostat, all you need to do is to set it and leave it alone. Because of this, a lot of homeowners tend to forget about their thermostats.  

However, thermostats are one of the biggest culprits of furnaces refusing to turn on. Try to adjust the thermostat temperature to see if your furnace reacts to it. If it does not, the connection between your furnace and the thermostat might be damaged.