When cold weather sets in, many homeowners rely on their heating system to stay comfortable. Unfortunately, like any appliance in your home, a heating system can experience issues from time to time. Knowing when you can address a problem yourself and when to call a professional can help ensure that your system receives proper care and continues operating safely and efficiently.
Thermostat Issues
One of the most common problems homeowners experience with their heating system is a malfunctioning thermostat. You may suspect an issue with the thermostat if the display screen remains blank or the system does not respond to temperature changes. As a homeowner, there are a few steps you can take to troubleshoot the issue. First, check the circuit breaker to see if the breaker controlling the furnace or thermostat has tripped. If so, resetting it may restore normal operation.
If that does not resolve the issue, check the thermostat batteries if your model uses them. Some thermostats are battery powered, while others receive power directly from your home’s electrical system. If new batteries do not fix the problem, the issue could involve loose wiring or a failing thermostat. Most thermostats have an average lifespan of about 10 years, after which replacement is often recommended.
Not Producing Enough Hot Air
Another issue you may encounter is a heating system that does not produce enough warm air. A good place to begin is by checking the HVAC air filter. If the filter is dirty or clogged, it can restrict airflow throughout the ductwork and reduce heating performance. Replacing a dirty filter is often an easy and effective solution.
If a new air filter does not resolve the problem, check your thermostat settings to ensure the temperature has not been lowered unintentionally. If neither the thermostat nor the filter is the cause, it is best to have an HVAC professional inspect the system. The issue could involve components such as the burner, flame sensor, heat exchanger, thermostat, or ductwork.
Furnace Blowing Cold Air
A furnace blowing cold air can be especially frustrating during winter. One of the first things to check is your thermostat fan setting. If the blower fan is set to On instead of Auto, it will continue pushing air through the vents even when the furnace is not actively heating. This can result in cool air coming from the vents between heating cycles. Switching the fan setting to Auto usually resolves this issue.
Not Starting
A furnace that will not turn on is a common concern for homeowners. This problem can have several possible causes. One helpful step is to listen for sounds when the thermostat calls for heat. Many furnaces make a clicking sound as internal components engage before the blower motor starts. If you do not hear this sound, the issue could involve the thermostat, control board, or another electrical component rather than a starter capacitor, which is not used on all furnaces.
If you hear the system attempt to start but no warm air comes from the vents, inspect the furnace further. Listen for the blower motor. If the blower motor does not run, the furnace may be shutting down due to overheating or a motor related issue. If the blower runs but the furnace does not ignite, the problem is likely related to ignition.
Older furnaces may use a pilot light. If so, check to ensure it is lit and relight it if necessary by following manufacturer instructions. Newer systems typically use electronic ignition. If the igniter fails to glow or spark, it may need replacement. If ignition occurs but the burner shuts off quickly, the issue could involve a dirty or faulty flame sensor, a burner problem, or a fuel supply issue. These situations should be evaluated by a professional technician.
Weird Noises
During normal operation, your heating system may produce mild clicking sounds or airflow noise. If you begin to hear unusual sounds, it may indicate a problem. The type of noise can offer clues about the issue. For example, a squealing noise often suggests a worn blower belt or motor bearing. Many noise related issues require a professional to safely identify the source and perform repairs.
Odd Smells
Unusual odors coming from your furnace can also signal a problem. The type of smell can help indicate the cause. A sulfur or rotten egg smell may suggest a gas leak, while a burning or metallic odor can indicate an electrical issue or overheating component. If you smell gas, shut off the system if safe to do so, leave the area, and contact your gas provider or emergency services. Any persistent or unusual odor should be inspected by a licensed HVAC professional.
A Note on Warranty Coverage
While some minor furnace issues, such as replacing a clogged air filter, can be handled by homeowners, most repairs should be performed by a licensed HVAC technician. Many manufacturers require professional service to keep warranties valid. Attempting repairs yourself may void warranty coverage and result in higher costs later. Professionals also have the proper tools, training, and experience to complete repairs correctly and safely.
Trustworthy HVAC Repair Service
DeWolfe Plumbing, Heating & Cooling provides reliable HVAC repair services for homeowners in the Falmouth, MA area. Our team also offers heating, air conditioning, plumbing, sump pump, indoor air quality, duct services, dryer vent cleaning, commercial AC, excavation, and water main solutions. Call us today to schedule your next service consultation.
