A malfunctioning furnace is a problem no homeowner wants to deal with. If your house features a gas heating system, you can familiarize yourself with the warning signs of trouble to prevent major breakdowns. Even though it's spring, you're probably still using this appliance to combat chilly evenings and nights. If you notice any issues with the system, schedule repair services for summer when the unit isn't in use. The following guide outlines some common signs that indicate something is wrong with your furnace. 

How Do You Know If Your Gas Furnace Is Malfunctioning? 

1. Pilot Light Discoloration

As gas gets pumped into the appliance’s main burner, it is ignited by the pilot light. If this flame is yellow instead of blue, the natural gas is not completely burning away, which means the burner needs cleaning or there’s a ventilation issue. 

Residual carbon monoxide gas is a health risk and can cause symptoms like dizziness, fainting, headaches, nausea, vomiting, disorientation, and fatigue. In extreme cases, inhaling too much carbon monoxide can be fatal. The gas also increases the unit’s combustibility. In the event of a yellow pilot light, shut the furnace off, and schedule professional services to identify and solve the problem. 

2. Odd Noises

No HVAC system is noise-free, and most emit humming sounds when they're on. However, strange noises indicate a problem. Broken internal components can cause clanking and rattling within the unit, while whistling and squealing indicates belt issues. 

Banging and squeaking can also signal a problem with the blower fan, which is the part that sucks cold air into the unit and disperses warm air into the ductwork and home. When the blades on this fan stop functioning correctly due to age-related wear and tear, the dust and dirt that accumulates on them make them noisy.

3. Reduced Heat Output

If you adjust your thermostat and the furnace doesn't generate more heat, there could be a ductwork leak that needs sealing. If this is the case, you may notice a spike in your energy bills, especially if you continuously turn the thermostat up to compensate for the lack of warmth. The thermostat itself could also be the problem. 

It could be sending incorrect messages to the furnace, which means it will require recalibration. If the unit produces cold air, the motor powering the blower fan is probably worn out. A faulty blower fan does not provide enough heat for your home.

If you require HVAC services for a problematic gas furnace, reach out to Dousman LP Gas. This family-owned company is based in Dousman, WI, and has been serving local residents for over 37 years. These gas suppliers and heating contractors provide propane deliveries and HVAC maintenance services, and they have an A+ rating with the Better Business Bureau®. Call (262) 965-2679 to make a repair appointment, or visit the website for additional service information.