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7 Common Furnace Problems Best Left to the Professionals

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If your furnace starts acting up, it can be tempting to try to fix the problem yourself. After all, it’s just a machine, right?


While furnaces are relatively simple machines, they’re also very complex and delicate. One wrong move while trying to fix a furnace can cause serious damage, or even start a fire.

That’s why we’ve put together this comprehensive guide on the seven most common furnace problems you shouldn’t try to fix on your own. By the end of this guide, you’ll know exactly when to call in a professional for help.

So, without further ado, let’s get started.

1. Cracked Heat Exchanger

One of the most common and potentially dangerous furnace problems is a cracked heat exchanger. The heat exchanger is a key component of your furnace, and its job is to transfer heat from the burning gas to the air that’s circulated throughout your home. 

If the heat exchanger cracks, it can leak carbon monoxide into your home. Carbon monoxide is a colourless, odorless gas that can be deadly if inhaled. So, if you think your heat exchanger might be cracked, it’s important to call in a professional right away. 

2. Faulty Gas Valve

Another common furnace problem is a faulty gas valve. The gas valve is responsible for regulating the flow of gas to the burners. If the gas valve is faulty, it can cause the furnace to overheat, which can be dangerous. 

If you think your gas valve might be faulty, it’s important to call in a professional right away. 

3. Problem with the Blower Motor

If your furnace is having trouble starting up, or if the blower motor is making strange noises, it could be a sign of a problem with the blower motor. The blower motor is responsible for circulating the air through the furnace. 

If the blower motor is having trouble, it could be because of a problem with the bearings, the motor itself, or the belt that connects the motor to the blower. 

4. Clogged Filter

A clogged filter is one of the most common furnace problems. The filter is responsible for trapping dirt, dust, and other particles that could damage the furnace. 

If the filter is clogged, it can restrict the airflow to the furnace, causing it to overheat. It can also cause the furnace to run less efficiently, which will increase your energy bills. 

5. Tripped Circuit Breaker

If your furnace keeps shutting off, it could be because the circuit breaker has been tripped. This is a safety feature that prevents the furnace from overheating. To reset the breaker, simply flip it to the “off” position and then back to “on.” If the breaker trips again, there could be a more serious problem with your furnace. In this case, you’ll need to call a professional for help.

6. Frozen Condensate Line 

A frozen condensate line is another common furnace problem. The condensate line is responsible for carrying away water that condenses on the heat exchanger. If the line freezes, it can cause water to back up and flood the furnace. If you suspect that the condensate line is frozen, you’ll need to thaw it out. To do this, you can use a hair dryer or a heat lamp. Once the line is thawed, you’ll need to check for leaks and repair any that you find.

7. Damaged Thermostat 

A damaged thermostat is another common furnace problem. The thermostat is responsible for controlling the furnace, so if it’s damaged, the furnace may not operate properly. If the thermostat is damaged, you’ll need to replace it. This is a relatively simple task that you can do yourself, but you’ll need to ensure that you get the right thermostat for your furnace.


There are a few common furnace problems that you shouldn’t try to fix on your own. These problems can be dangerous and may cause further damage to your furnace. If you’re not sure how to fix the problem, it’s best to call a professional.

Climate Experts is a Canadian-owned and -operated company that provides services to the Durham region, the GTA, and the surrounding regions. We install, repair, and maintain furnaces and air conditioners from all major manufacturers. Since we are available 24/7, we can handle your emergency requests swiftly and effectively. Contact us for furnace maintenance

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