Common Problems With a Furnace


No one wants to turn on their furnace only to find that it’s not working properly. Unfortunately, this is a problem that many homeowners face every winter. While there are a number of potential causes for furnace problems, some are more common than others. In this article, we’ll take a look at some of the most common furnace problems so that you can spot them early and avoid a costly repair bill or a night without heat.

Furnace Troubleshooting

Faulty Thermostat

A thermostat that isn’t doing its job is one of the most common furnace problems. If your furnace won’t turn on, or if it turns off and on erratically, it’s likely that your thermostat is to blame. Thermostats can break down over time, especially if they’re not well-maintained. If you suspect that your thermostat is the cause of the problem, set the fan on auto and see if it is running continuously. If it is, then you know that the thermostat is the problem and you may need to replace it.

Dirty or Clogged Filters

A dirty filter is one of the most common causes of furnace problems. If your furnace’s filters are clogged, it can cause the furnace to overheat and shut off prematurely. It can also cause the furnace to run less efficiently, which will increase your energy bills. To avoid these problems, be sure to check and clean your furnace’s filters regularly. It is recommended to replace your filters after three months at the most.

Strange Furnace Noises

Rattling, chirping, popping, or banging noises coming from your furnace is never a good sign. These noises can indicate that there is something loose inside the furnace, such as a piece of metal or a broken fan blade. Popping noises may be due to ductwork problems. If you hear these kinds of noises, it’s best to turn off the furnace and call a qualified technician to take a look.

Malfunctioning Limit Switch

If your furnace is always blowing, it may be because the limit switch is malfunctioning. The limit switch is responsible for telling the furnace when to turn on and off. If it’s not working properly, the furnace will keep running and blowing cold air. This problem can usually be fixed by a qualified technician.

Pilot Light Issues

A weak, strangely colored, or flickering pilot light is a sign that there is a problem. A flickering or yellow pilot light may be due to excess carbon monoxide in the furnace. This can be a serious problem, so if you see this, turn off the furnace and call a technician immediately.

Cracked Heat Exchanger

A cracked heat exchanger is a serious problem that can be dangerous. A cracked heat exchanger can leak carbon monoxide into your home. If you smell gas or notice unexplained flu-like symptoms in your home, it’s important to turn off the furnace and call a technician right away.

Furnace Cycling on And Off

When the furnace turns on and off too frequently, it’s a sign that something is wrong. This can be caused by a clogged filter, a faulty thermostat, or even poor airflow. If you notice this happening, it’s best to call a technician to take a look. A furnace that cycles too frequently will make you spend more on your energy bills and it can also shorten the life of your furnace.

Worn Out Ball Bearings

With time, the ball bearings in your furnace’s blower motor will wear out. When this happens, it can cause the motor to make scraping sounds. This usually occurs after years of use. Because the furnace motor won’t function properly with worn-out ball bearings, it’s best to call a technician to replace them.

Furnace Not Blowing Air

If your blower is covered in dust or if the air filter is clogged, it can cause the furnace to stop blowing air. Another possibility is that the blower motor itself is faulty and needs to be replaced. You can clear the dust from the blower and replace the air filter yourself, but if the problem persists, or you see a flashing red light on the blower, it’s best to call an HVAC technician.

Malfunctioning Blower Belt

Is your furnace making a squealing noise? It may be because the blower belt is loose, broken, or worn out. This problem can usually be fixed by tightening or replacing the belt.

There are many different furnace problems that can occur. Some are more serious than others, but all should be fixed as soon as possible to avoid further damage or even danger. If you notice any of the above problems with your furnace, be sure to call a qualified technician to take a look.

Do You Need Furnace Repair or Service?

If you’re having problems with your furnace, don’t wait to call a technician. The sooner you get the problem fixed, the better. By calling a qualified technician at All American Plumbing, Heating & AC, you can avoid costly repairs or even a dangerous carbon monoxide leak. If you think you need furnace repair or want to schedule furnace service, contact us today at (209) 710-5629. We’ll be happy to help you get your furnace back up and running safely and efficiently.