Air Handler Troubleshooting: Fan, Control Board, and Airflow Issues
When your home’s temperature doesn’t feel as comfortable as it used to and you can’t seem to find the culprit, it may be time to do some basic air handler control board troubleshooting. Inside your heating, ventilation, and air conditioning (HVAC) system, you’ll find your air handler unit.
Usually, when you notice a lack of airflow, warmer-than-usual air, or the fan in your system running nonstop, there may be components that aren’t working properly. Especially if your system has also stopped responding to temperature changes.
Here at Alpha Heating & Air, we’re experts at fixing air handler issues. Reach out to us at 541-216-4539. However, if you’d like to know what kind of troubleshooting we do, keep reading.
What Does an Air Handler Do?
The air handler is the indoor half of your HVAC system, responsible for distributing air throughout your home via your ductwork.
How the Fan, Control Board, and Airflow Work Together
In an ideal situation, the air handler, the blower motor, the evaporator coil, and the control board work together.
When you adjust the temperature on your thermostat,, the control board receives the signal and triggers the blower motor to start. Then the fan pushes conditioned air through your ductwork into your home.
It’s an intricate process, which is why even a small issue with just one component can drastically affect how your HVAC system performs.
Common Air Handler Problems
Fan and Blower Motor Issues
If your blower motor or air handler fan starts developing a problem, you’ll probably first notice weak airflow. Also, you might realize that the air handler fan runs constantly, despite your heating and cooling being off.
Unfortunately, this type of problem is more common along the coast because humidity and salt air can accelerate the corrosion of electrical components and wear on motor bearings. To fix the problem, our team evaluates your component performance. From there, we can replace a capacitor or a failed motor as needed.
Control Board Problems
Your control board is like the brain of the air handler. When it malfunctions, components may short-cycle, fail to start, or operate intermittently. The unit may not respond when you want to change the temperature in your home.
This especially becomes a problem because older Bandon homes are more likely to have issues with moisture intrusion and corrosion on board connectors because of the quality of the coastal air. Most mechanical spaces aren’t conditioned.
When we do air handler troubleshooting, we diagnose and replace the control board. Afterwards, routine maintenance will help us get ahead of any problem that may develop.
Weak or Uneven Airflow
Weak airflow is often connected to clogged air filters, blocked return vents, or malfunctioning blower motors. If you notice that airflow is uneven in different rooms, you may be dealing with duct leaks or an improperly sized installation.
You can troubleshoot by opening vents and grilles. If the filter is dirty, it should be replaced. For internal problems, you’ll need a professional inspection. Then, we can recommend the best AC, heat pump, and furnace repairs for your needs.
Simple Checks Before Calling a Technician
Before you call for an inspection, there are a few air handler control board troubleshooting steps you can handle on your own if you’re up to it.
- Check Filters: See if your filter is dirty. If it’s been more than 60 to 90 days since the filter was replaced, change the filter.
- Confirm Vents Are Open: Verify that all of your supply and return vents are open and unobstructed by furniture.
- Verify the Thermostat Settings: Look at your thermostat settings to see if the thermostat is set to the right mode and temperature. If your display is unresponsive or dim, you may need to replace the batteries.
These tips can help with basic problems. If they don’t work, you’ll need to call a technician for help diagnosing and repairing internal components. That’s where we come in.
Fixes That Usually Require a Professional
How do you know when it’s time to call a professional? From capacitor replacements to new AC installations, there are a few problems that require professional help.
- Capacitor Replacements: This is one of the most common reasons why a blower motor won’t start. Because of the dangerous levels of electricity involved, capacitors should only be replaced by an expert.
- Blower Motor Replacement: In coastal homes, corrosion increases the likelihood of blower motor issues. Our team can replace a seized or failing blower motor.
- Control Board Diagnosis and Replacement: Our team can test your board circuits to find and replace faulty components. No guesswork, just fixes.
- Duct Inspection and Sealing: To solve airflow issues, we inspect and seal leaks in your ductwork, wherever they might be.
- System Sizing Review: An improperly sized system will struggle to create and deliver conditioned air throughout your home. After determining the appropriate load capacity, we can recommend the right heat pump or air conditioning system installation for your home.
Frequently Asked Questions About Air Handler Problems
Why is my air handler fan running, but no conditioned air is coming out?
If the fan appears to be running normally but your home isn’t the appropriate temperature, it could be a number of things. Common causes include refrigerant issues, frozen coils, outdoor unit problems, or compressor malfunctions. Because of the risks involved, it’s important to schedule professional HVAC repairs.
How do I know if my air handler control board is bad?
HVAC control problems can lead to error codes on the digital thermostat display and problems with the system not turning on when the thermostat calls for it to do so. One of our technicians can troubleshoot this problem by testing the voltage at the board terminals. Once the control board failure is confirmed, we can recommend the best replacement option.
Why is airflow weak in some rooms but strong in others?
If your home has uneven airflow or no airflow from vents, it can be due to duct leaks, dampers that have shifted, or a malfunctioning blower motor. The best way to troubleshoot this problem is by getting a full duct inspection and identifying where air is leaking from the duct system.
How long do air handlers last?
In inland areas, a well-maintained air handler will last 15 to 20 years. However, coastal Oregon’s humidity, salt air, and corrosion rates shorten this average lifespan. To extend your air handler’s longevity, we recommend scheduling annual maintenance to protect your system and catch failing components before they lead to a total HVAC failure.
Schedule an Air Handler Inspection With Alpha Heating & Air
If you’re having airflow problems, fan issues, and control board malfunctions, our experienced HVAC technicians can diagnose and repair the problem. With our speedy services and upfront pricing, you can get immediate help with your air handler control board troubleshooting.
Schedule your air handler inspection today with Alpha Heating & Air. Call us at 541-216-4539.









