As the weather gets colder, the last thing you want is to have your furnace break down. Regular maintenance, like changing the air filter as recommended, can prevent the need for a furnace repair. However, some common problems require a professional’s help to keep your home warm and safe. Consider the following tips to see if you need to call in a professional.

The 4 Most Common Reasons Your Furnace Isn’t Working

1. Pilot Light Problems

If the pilot or ignition light in your furnace goes out, then the unit won't work at all. Malfunctioning pilot lights can stem from several causes, including a strong draft near the furnace to a broken thermocouple. Although you should be able to reignite the pilot yourself easily by following the instructions, if it continues to go out or burns inefficiently, then call for furnace repair. 

2. Malfunctioning Thermostat

Your furnace is controlled by a thermostat that tells the unit how long to run to reach the desired temperature. If the thermostat malfunctions, your furnace may not produce enough heat or could create too much. In addition to not being able to control the amount of heat generated, a broken thermostat will cause the furnace to cycle on and off repeatedly, or make the blower turn on more than usual. 

3. Strange Noises

If your furnace makes any unusual sounds, such as scraping or squealing noises, that’s an indication of an issue within the machine itself. Scraping noises usually mean that the ball bearings in the motor are worn out, while slipped or frayed blower belts can cause various noises. If you hear anything coming from your heater, turn it off immediately and call for a furnace repair.

4. Cracked Heat Exchanger

In gas furnaces, the heat exchanger is the part of the furnace that heats the air. If this part, which is a set of coils or tubes, becomes damaged or cracked, it can leak toxic gases into the air that are harmful to your family. If you notice strange smells near the furnace, soot around the furnace, water on the floor, or cracks and corrosion on other parts of the furnace, call a professional for help. Be alert to any physical signs of illness as well, including headaches or eye irritation, which can be a sign of poor air quality caused by a broken furnace.

If the furnace isn’t working and you need a reliable furnace repair professional, turn to Marvin's Heating & Air Conditioning in San Marcos, TX. With over 36 years of experience meeting the HVAC needs of Texas residents, their licensed and insured team keeps you comfortable and safe year-round. Visit their website to learn more about their services, or call (512) 396-4791 to schedule repairs.