At Fast Response Heating & Cooling, we’ve seen countless broken furnaces, and we’ve also helped bring many of them back to life. Therefore, we know some of the most common causes of furnace problems.

The top causes include:

• Dirty air filters. Clogged air filters restrict airflow so your furnace has to work harder to warm up your space. This often explains cases of weak heating. In worst-case scenarios, the clog can also cause the unit to overheat and shut down.
• Wrong thermostat settings. A faulty thermostat can send the wrong signals to your furnace. Depending on the setting, the furnace may run continuously, cycle on and off too frequently, or fail to run at all.
• Ignition troubles. If the furnace system doesn’t ignite properly, it will struggle to produce any heat, if at all. Ignition issues often point to a faulty igniter, a clogged pilot light, or gas supply problems.
• Blower motor problems. If the blower motor isn’t working properly, it won’t circulate the heat generated by your furnace system properly across your home. This can also lead to uneven heating.
• Cracked heat exchanger. A cracked heat exchanger is a dangerous problem that needs to be addressed quickly. If your carbon monoxide detector goes off while your furnace is running, you most likely have a cracked heat exchanger. Shut the system down immediately.