What Are the Most Common Furnace Problems?

The following article enlists the most common furnace problems. Give this article a read till the end.

10 Most Common Furnace Problems:

1. Power Isn’t Getting to The Furnace

We realize it seems silly to suppose it was unplugged in some way, but it’s definitely worth a look before moving on to other options.
Check to determine whether the circuit breaker has tripped if your furnace is hooked in.
If the breaker that controls the furnace is turned off, turn it back on.
If the switch is between ON and OFF, flip it to OFF first.
Assume the tripped breaker was a fluke and breathe a sigh of relief if it stays in the ON position.
There could be a problem with the wiring or the breaker itself if the breaker trips again. In any scenario, a certified electrician should be consulted.
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2. The Furnace Makes a Grinding or Scraping Noise

If your blower is making a grinding or scraping sound, your ball bearings are worn out, and you should switch it off right away.

3. A Squealing Noise Is Coming from The Furnace

Furnaces that squeak suggest a slipping or worn blower belt. Therefore, you should be able to handle this repair on your own if you’re mechanically inclined. However, if there isn’t any visible damage to the belt, tighten it. (Just don’t go overboard, or you’ll have Problem #2.)

4. Pilot Light or Ignition Issues

If your older furnace’s pilot light won’t remain lit, you’ll need the assistance of a professional to check various possible issues. Moreover, it’s possible that you have a faulty thermocouple or a clogged pilot orifice, that your flame setting is too low, or that you have a faulty safety switch (which is obviously a big deal).
However, turn off the gas supply and wait several minutes before attempting to relight your pilot. Moreover, natural gas is extremely combustible, and if your pilot light has been out for a long time, a dangerous amount of gas may have built up around the unit. Therefore, always refer to your owner’s handbook for instructions.
It’s important to inspect the condition of your flame sensor if you have an electric Igniter. Additionally, when your furnace detects gas but no flames, this vital safety feature shuts down the entire system. When these sensors become dirty, they are unable to “see” the flames, causing everything to be turned off unnecessarily. To clean yours, follow these steps:

1. Firstly, turn off the power to your furnace either at the unit or at the circuit breaker (I’m not just talking about the thermostat).
2. Secondly, you need to shut down the gas supply valve.
3. Thirdly, carefully remove the flame sensor, which is a thin metal rod situated at the burner assembly, with a 14-inch hex-head screwdriver.
4. Moreover, you may use fine-grit sandpaper or an emery board to gently rub the sensor. (A $1 bill will do the trick, too!)
5. Lastly and most importantly, replace the sensor after wiping away any leftover dust with a paper towel.
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5. Filters Are Dirty

You cannot overstate the need of replacing your furnace filters on a regular basis. Furthermore, filters that are clogged impede airflow, making your furnace work harder. This might cause the heat exchanger to overheat, causing your unit to shut down.
You’ll have an inefficient furnace that produces less heat for more money at best. In the worst-case scenario, you’ll reduce the lifespan of your furnace and end up with a cold house. If your furnace isn’t providing enough heat or is continuously cycling on and off, it’s likely that it’s running out of air. You need to replace those filters urgently.

6. Access Panel Is Open

As you’ve probably learned, getting to the heart of your furnace necessitates removing a panel from the unit. Moreover, if you have not closed the panel completely, the furnace will not function. Yet another safety option to avoid injuries.

7. Dirty Burners

If your burners become clogged, they won’t be able to emit enough natural gas to ignite, leaving you without heat.
Any other color, such as yellow or orange, indicates the presence of rubbish in the mix; blue flames indicate a healthy burner; any other color, such as yellow or orange, indicates the presence of junk in the mix. When dirty burners try to light, they can make an impressive boom-rumble. Although there are countless results for “how to clean dirty burners” on Google, we strongly advise against doing it yourself. There are far too many things that can go wrong—and soon.

8. A Cracked Heat Exchanger:

A fractured heat exchanger may negatively affect the capacity of Your furnace to do its job. Moreover, it can allow dangerous carbon monoxide to flow into your home. The symptoms of a fractured heat exchanger can be difficult to detect, however, they include: Your furnace has soot on the interior.
Around the furnace, there is water on the floor.
Headaches, inflamed eyes, nausea, disorientation, or flu-like symptoms in your home are all signs of carbon monoxide poisoning.
If you suspect your furnace has a fractured heat exchanger, turn it off right once.

9. The Furnace Isn’t Blowing Air:

You most likely have a broken blower fan belt if your furnace turns on but doesn’t seem to be pushing air. Replace the belt according to the directions in your owner’s manual, as we suggested in Problem #4. (or let us do it for you).

10. Popping or Pinging Ducts:

Ducts expand as they heat up and contract as they cool, which explains the majority of the popping and pinging noises you hear. You can possibly have a sagging metal flap inside a duct that wiggles as air passes through. If you can pinpoint the source of the sound, try making a small dent in that spot to see if the sound stops.


In conclusion, we can say that every furnace has problems at some stage. Therefore, you may not need to panic. Rather contact professionals to solve your issues.

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