Common HVAC Problems and How to Fix Them

A Troubleshooting Guide for Homeowners.

Your HVAC system is crucial in keeping your home comfortable year-round. However, like any home appliance, it can sometimes encounter problems. The good news is that many HVAC issues can be resolved with a bit of troubleshooting and some basic know-how.

In this guide, we’ll discuss common HVAC problems and provide tips on how to fix them before calling a professional.

1. The HVAC System Won’t Turn On

One of the most frustrating issues is when your HVAC system doesn’t turn on at all. This can happen for several reasons, but don’t panic! Here are some steps to check:

Troubleshooting Tips:

• Check the Thermostat: Depending on the season, ensure that it’s set to “Cool” or “Heat” mode and that the temperature setting is lower (for cooling) or higher (for heating) than the current room temperature.
• Inspect the Circuit Breaker: Sometimes, a power surge can trip your HVAC system’s circuit breaker. Go to your breaker box and reset any tripped switches.
• Check for a Blown Fuse: Older systems may use fuses instead of breakers. A blown fuse in your HVAC unit could prevent it from turning on. If you’re comfortable, replace the fuse; otherwise, consult a technician.

If none of these steps work, it’s time to call in a professional, as the issue might be related to faulty wiring or a more complex electrical problem.

2. Uneven Heating or Cooling Throughout the House

Do you notice some rooms in your home are warmer or cooler than others? If not addressed, this issue can lead to discomfort and higher energy bills.

Troubleshooting Tips:

• Check the Air Vents: Make sure all air vents are fully open and unobstructed. Furniture, rugs, or curtains blocking vents can restrict airflow, causing temperature imbalances.
• Replace or Clean Air Filters: Dirty air filters can reduce airflow and make it harder for your system to distribute air evenly. Change filters every 1-3 months to keep the air flowing smoothly.
• Check the Ductwork: Leaks in your ductwork can cause air to escape, leading to uneven temperatures. While this is generally a job for a professional, you can inspect visible ductwork for obvious gaps or loose connections.

3. The HVAC System is Constantly Running

If your HVAC system never seems to turn off, it could be a sign of a problem. Not only does this waste energy, but it also puts unnecessary wear on the system.

Troubleshooting Tips:

• Inspect the Thermostat: Double-check the thermostat settings. If it’s set to “ON” instead of “AUTO,” the fan will run continuously. Set it to “AUTO” so that the fan only runs when the system is actively heating or cooling.
• Clean the Evaporator Coil: A dirty coil can reduce the system’s efficiency, causing it to work harder than necessary. Turn off the unit, access the coil, and gently clean it with a soft brush or vacuum.
• Check for Air Leaks: If your home isn’t well-insulated, your HVAC system might be compensating for the loss of conditioned air. Seal gaps around windows, doors, and ducts to keep the temperature stable.

4. Strange Noises Coming from the HVAC System

Noises like banging, rattling, or squealing are never good signs. These sounds indicate that something is wrong, and ignoring them can lead to costly repairs down the road.

Troubleshooting Tips:

• Loose or Damaged Parts: Rattling noises may mean there’s a loose screw or panel. Tighten any visible screws and panels, but be careful not to over-tighten.
• Squealing Sounds: This often indicates a problem with the blower motor or a worn-out belt. While lubricating the motor bearings may help, replacing the belt usually requires a professional’s touch.
• Banging or Thumping: This can mean something is obstructing the blower. Turn off the system, inspect the blower compartment, and remove any debris.

5. Poor Airflow or Weak Air Coming from Vents

When your HVAC system is running but there’s hardly any air coming through the vents, it can be frustrating and uncomfortable.

Troubleshooting Tips:

• Change the Air Filter: The most common cause of weak airflow is a clogged air filter. Replace it with a new filter to restore proper airflow.
• Inspect the Ductwork for Blockages: A blockage or leak in the ducts can restrict airflow. Check accessible areas of your duct system for any visible blockages.
• Clean the Air Vents: Dust and debris can build up in vents over time, reducing airflow. Remove the vent covers and clean them thoroughly.

6. The HVAC System Blows Warm Air (When It Should Be Cooling)

If your air conditioner is blowing warm air, it defeats the whole purpose of cooling your home. Luckily, this issue is often easy to fix.

Troubleshooting Tips:

• Check the Thermostat Settings: Make sure the thermostat is set to “Cool” mode and that the temperature is set lower than the current room temperature.
• Clean the Outdoor Unit: Dirt, leaves, and debris can clog the outdoor condenser unit. Turn off the system and gently hose down the unit to remove any buildup.
• Check the Refrigerant Levels: Low refrigerant is a more serious issue that requires a professional’s help. Signs of low refrigerant include ice on the coils or a hissing sound near the unit.

When to Call a Professional

While many HVAC issues can be addressed with basic troubleshooting, there are times when it’s best to call a professional. If you’ve tried the above steps and the problem persists, or if you’re unsure about handling electrical components, don’t hesitate to reach out to an HVAC technician.

Regular maintenance and prompt repairs can prevent small problems from becoming costly headaches.

Final Thoughts

Taking the time to troubleshoot and fix minor HVAC problems can save you time, money, and stress. However, keeping up with regular maintenance, like changing air filters and cleaning the system, is key to avoiding these issues in the first place.

If you’re ever in doubt, it’s always better to be safe and call a professional for help. By keeping your HVAC system in top condition, you can ensure a comfortable and energy-efficient home all year long!

If you are experiencing a problem with your air conditioning or heating call us at 512-336-1431 to schedule an appointment. We’ll be glad to come out and take a look at the issue.

1431-183 A/C & Heating proudly serves Round Rock, Georgetown, Cedar Park, Pflugerville, Leander, Liberty Hill, and North Austin.