A Home Owner's Guide on How to Fix a Broken Furnace

A Home Owner’s Guide on How to Fix a Broken Furnace

Trust me, it’s very frustrating to be left in the bitter hands of cold during winter because of a broken furnace. There are many common furnace problems that can cause your furnace to stop working and leave you in the cold.

A Home Owner’s Guide on How to Fix a Broken Furnace

In this post we’ll take a look at some problems you may have with your home furnace and how to fix a broken furnace. I will provide you with all the tips you need on how to check a broken furnace and educate you on when the services of a furnace repair technician would be needed.

Although a furnace may require an HVAC technician there are some things you can do as a home owner to better understand the problem with your home’s furnace and take some steps to remedy any problems with the furnace.

You need to know that whatever furnace you are using, there are certain things you need to know about it. You should find time to fully understand how it works so that you can easily identify any issue that may eventually come up.

When you discover that your furnace is not functioning the way you want it to, you should use these tips to get it back to its former state.

Are you still wondering what can cause a heating system or furnace to stop working?

Sit back, read on and enjoy the ride as I dish out these well detailed do-it-yourself tips that you will find helpful.

Could it be that your thermostat is off

Could it be that your thermostat is off?

Are you surprised? Even as awkward as this may sound, it could just be the reason why your furnace stopped working. So, don’t panic yet, don’t call a furnace repair technician just yet too, check your thermostat to ensure it is properly set on “heat”. Also, make sure it is set at a minimum of 5° above room temperature then watch to see if it comes on.

Another common problem with the thermostat is the battery operated thermostats can sometimes need the batteries changed. While many battery operated thermostats will have warning lights which indicate the batteries need changing it can cause some system problems when they are weak or dead.

The control house of your furnace is your thermostat and it could be the reason behind your furnace not functioning properly. You see why you need to check it out to make sure that it is on?

Check out these steps you can carry out on your thermostat.

Step 1: Inspect the battery on the thermostat and check if it is still working. If it’s not working, you may need to change the batteries. I will advise you to change the batteries on your thermostat once a year or as soon as they stop working.

How do you know when the batteries on your thermostat die off? You will notice that you can’t use the heating and cooling system of your thermostat and the display will be empty. Some thermostats that make use of batteries to operate usually give a low battery signal when they are due for a change.

Step 2: You can also open your thermostat blow out any dust or particles that may have obstructed it, carefully.

Step 3: You should set the date and time to make sure it is accurate.

Step 4: You can as well check if the fuse for the furnace is working. Switch off the breaker.

Instead of just sitting back and still asking yourself this question, “what can cause a furnace to stop working?”, you can just try out those steps and see what the results will yield.

You should consider checking the furnace’s air filter.

Do you know the function of your furnace’s air filter? Let me tell you.

Its function is to ensure that the air blowing through your home is not polluted in any way. It’s normal for your furnace’s air filter to get obstructed after a while. You must clean up your furnace’s air filter often because if you don’t, a dirty air filter will: limit the circulation of air, it could also lead to overheating and it could also lead to a total shutdown of your furnace.

How can you test a clogged air filter? You simply raise it so light can penetrate through it and try to see if you can easily see through it. If you can’t, it shows that dust has tampered with it. If you also notice a dirty smell from the vents of your furnace when the blower is on, it shows that it requires replacement.

You can easily check and replace your air filter

You can easily check and replace your air filter. Just follow the process below:

Step 1: Switch off your furnace.

Step 2: Try to find where the filter is located on your furnace. Some filters look like a grill with openings where small objects can pass through while others are found inside the furnace. What direction are your filter points facing? If they are facing upside-down, their performance would be low.

Step 3: Clean the area around the filter and change it following the instructions on the producer’s manual. You can get a new filter from a hardware store around you. Ensure you change your air filter after three months or as often as the manual of the manufacturer recommends.

If you change your furnace’s air filter often, it will enhance the quality of air that comes out from your furnace, it will reduce your energy bills, and also help you preserve the HVAC components in your furnace.

Funny noises from your furnace

Funny noises from your furnace.

Have you ever heard a funny noise coming out from your furnace?  Your furnace may be working well but you might still get to hear some kind of unpleasant noises coming out from it.

Let me outline some of these noises and what could be causing them.

 A squealing noise: If you hear this kind of noise, it could be that a belt got worn out. You might need a replacement for it or lubrication.

Clicking noise: You might notice that your furnace clicks on its own without it coming on. It might be that your gas valve is leaking or your heat exchanger has a crack.

If you notice that your gas valve is leaking, you need to quickly contact a furnace technician to help you fix it. If you don’t, carbon monoxide would keep being released into the air and it is harmful to your health.

Rattling noise: If you hear a rattling noise, it may be that there are gaps in your ductwork that you need to seal or loose panels that you need to tighten.

Banging or boom noise: If the burners in your furnace are dirty, it may delay the ignition for a short while and when the gas builds, it may give out that boom noise.

Grinding noise: For this particular noise, you need a technician to help you fix it. It means that the motor bearings need to be fixed.

Where you try to handle the noise from your furnace and it doesn’t work, get a technician to help you deal with it before it becomes worse.

Inspect the burner flames: You should inspect your burners regularly to get rid of soot and condensation. Contamination is one of the reasons why your burners get faulty.

Do you normally experience a change in the flames of your burners? If your burner is blue, it shows that it is clean but if they are yellow, it shows that they need to be cleaned with a vacuum cleaner. Before you clean it, turn off your gas and power. Cleaning the area around your burner too is necessary.

Replace your burner if it gets bad and you should get your burner cleaned yearly.

Lubricate the furnace blower annually: Lubricating your furnace blower before the winter comes is very important as it helps to prolong the effectiveness of your furnace.

So, how can you lubricate your furnace blower motor? Check out these steps. Typically, this procedure should only be done by a trained HVAC technician. If you need to remove panels to access the inside of your system it’s always advised that you call a licensed professional to service the unit. 

Step 1: Ensure you switch off the circuit breaker located at the main electrical panel.

Step 2: Get a screwdriver and loosen the screws on the furnace access panel.

Step 3: Go to the lower part of your furnace and look for the blower motor, loosen out the bolts around the blower motor using a wrench.

Step 4: Also, find the screws at the side of the housing of the blower motor. Remove the bolts and pull out the blower motor from the housing.

Step 5: Check the motor and shaft and look for the oil ports.

Step 6: And then you gently put some drops of oil into every oil port.

Step 7: Turn on the furnace and watch your blower motor burn well.

You see, it’s quite easy. Now go try it out using the steps I outlined above.

Don't you think it's time to call the attention of an HVAC repair technician

Don’t you think it’s time to call the attention of an HVAC repair technician?

You can check all of those things I mentioned earlier and discover that they are all intact but your furnace is still not working properly. If that is the situation you are currently in, it is time for you to call the attention of an HVAC repair technician. They should be able to fix whatever problems your furnace is encountering.


I am sure you learned great tips on how to fix a broken furnace. Have you tried fixing a broken furnace before? Did it work? Or did you end up calling a furnace repair technician?

I will advise you to always get your furnace checked as often as possible or as much as the producer recommended you to. This will help you notice little faults in your furnace before they escalate to something bigger. Learn to maintain it as well. There are good maintenance habits you should practice if you want to get the best out of your furnace.

Where the faults you detect are beyond what you can handle, don’t hesitate to employ the services of a furnace repair technician. This will save you from the stress of worsening things for yourself and your furnace.



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