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Cardinal Heating & Cooling

(708) 318-0804

​16w273 83rd St. Suite A2

Burr Ridge, IL. 60527

​​​                                          Common Causes of Furnace Failures

Your furnace is an indispensable part of your family’s life, keeping you safe and warm when winter becomes intolerably cold. For the most part, your heating system is able to do its job, keeping you comfortable and dry, but sometimes, it displays some unusual behavior. Let’s take a look at the most common causes of furnace issues.



1.       Ignition Failure
Ignition failure is one of the main reasons why your furnace doesn’t generate warm air. When your furnace’s ignition fails, the system has no source of producing heat. Another possible reason for a no heat situation is if there are bubbles in the gas line, which prevents proper ignition. Your heating system has a complicated structure that uses gas, electricity, and water. Trying to perform quick fixes on your own can be extremely dangerous, make sure to have a HVAC professional deal with your gas lines.


2.       Clogged Filters
The air in your home is constantly circulating through the furnace filters, and dirt and dust is accumulated each time the system is running. When filters are clogged, this restricts the airflow and affects both the system’s performance and the quality of air. Certain furnace models have safety mechanisms that prompt the system to shut down when the filters get clogged. This process prevents further damage to the furnace and it tells you it’s time to clean or replace your filters.


3.       Faulty Thermostat
Your thermostat is responsible for controlling your furnace in order to provide the warmth your home needs. If your thermostat is not working properly, your furnace won’t be able to warm up your home to your desired temperature and will affect your comfort levels. While waiting for your technician, check to ensure the thermostat is set to “heat” and the fan is set to “auto”. Also, check to make sure there is power to the thermostat and that the batteries are good. In addition, ensure that the thermostat is completely level and free from any sources of heat, like cooking devices.



4.       Leaking Problems
If you have a new, condensing high-efficiency furnace, it’s normal for it to produce water while heating. However, a furnace can also leak water because of clogged drain pipelines due to a cracked hose inside the furnace, the heat exchanger, or the collector box. If you discover noticeable pools of water around your furnace or cracks in your system, call a professional heating technician right away as constant leaking can damage your floor, ceiling and woodwork. If neglected, these leaks can also cause the growth of microorganisms that can pose danger to your family’s health.



5.       Constantly Running Blower
If your furnace’s blower doesn’t stop running, this may indicate a problem with the limit switch. This issue requires a professional inspection, as it will need to be replaced immediately once the problem is confirmed.



6.       Noisy Furnace
If you have a gas-fired unit, loud noises can be caused by over-firing burners or an extremely high gas pressure. In other cases, a failing motor creates whiny vibrations that indicate your furnace has a serious problem that requires immediate professional attention. In newer high-efficiency units, the airflow is under greater restriction since the air filter has finer pores through which the air passes. To make up for slower airflow, the blowers tend to run higher and faster to overcome these restrictions, causing loud noises during heating.



7.       Constant Cycling
When a furnace is cycling, it means that it’s trying hard to produce a consistent temperature in your home. Airflow may be a problem so check for closed vents or a dirty filter. Open the vents and replace your air filter, as needed. Also, lowering the temperature helps your furnace to run more efficiently because it won’t have to work as hard. Oftentimes, mechanical problems cause constant cycling. Faulty switches, overworked blower fans, and poor fuel mixes in the unit are just some of the things that can cause a furnace to continuously cycle.



If you’re experiencing any of these problems, don’t hesitate to call Cardinal Heating & Cooling. Our heating technicians are some of the best in the area and will get your heating system back in shape as quickly as possible.