10 Most Common HVAC Problems

You probably take your HVAC system for granted—until it becomes unreliable. Like any complex machinery, heating and cooling equipment can encounter issues from time to time. Understanding the most common HVAC system problems saves you time and money by simplifying the troubleshooting process. Here’s a look at the top AC/heating troubles and their possible solutions.

1. Air conditioner won’t turn on: This common issue often relates to a faulty power source, such as dead thermostat batteries or a tripped circuit breaker. Check whether these components are functioning to possibly resolve the issue without needing professional intervention.
2. AC not blowing cold air: If the air conditioner runs but produces lukewarm air, a dirty filter is a likely culprit. This restricts airflow and may lead to a frozen coil if left unaddressed. Try replacing the air filter before calling an HVAC company for help.
3. Indoor or outdoor unit freezing up: Proper airflow and refrigerant levels are crucial to prevent ice buildup. Regular maintenance can identify and rectify issues in these areas, so don’t delay scheduling your next service.
4. Noisy air conditioner: After years of running your HVAC system, you know what it should sound like. If you detect any off-putting noises, it’s best to turn off the system and call for help to avoid making things worse.
5. Smelly AC unit: Unusual odors from your HVAC system may indicate anything from mold growth within the ductwork to burned-out electrical components. Address these smells promptly to prevent more serious issues.
6. Drainage problems: Air conditioners and high-efficiency furnaces produce water , which drains away through a condensation drain system which could drain to the outside of the building or aa nearby floor drain. A clogged line could result in water damage and mold growth, so regularly clear the drain of dust, algae, and debris to keep the condensate flowing.
7. Thermostat malfunctions: A faulty thermostat leads to comfort issues. If your thermostat is acting up, try replacing the batteries. If that doesn’t work, a more complex wiring problem could be to blame.
8. Dirty condenser: The condenser coil contained within the outdoor unit gets dirty over time, reducing the system’s ability to cool your home. Keep an eye on the unit and hose it down gently as needed to remove dust, dirt, and other debris.
9. Ductwork leaks: Air ducts circulate conditioned air around your home. Leaks within this system reduce efficiency and comfort. Properly seal and insulate the ductwork to lower your energy bills and promote a more uniform temperature from room to room.
10. Frequent cycling on and off: Short cycling is when your HVAC system turns on and off frequently which could lead to not being able to completely fulfill a heating or cooling cycle. This problem increases wear and tear, reduces efficiency, and leads to uncomfortable temperature fluctuations. Address short cycling quickly to prevent further system damage.

If any of these top AC/heating troubles are affecting your home comfort, reach out to Oregon Heating & Air Conditioning for help. Our licensed, bonded, and insured team has 25 years of experience delivering exceptional customer service and reliable HVAC solutions. We focus on your satisfaction and always provide the most cost-effective services, whether that’s a repair or a replacement. For a free estimate on HVAC services in Portland, Beaverton, Hillsboro, or the surrounding area, please call us at 503-673-3265 or complete our online contact form.