Why Is My Air Handler Constantly Running? Here’s The Answer You Need To Know

If your air handler seems to be running non-stop, it’s time to investigate why. A constantly running air handler can be a sign of various issues, from minor inconveniences to serious problems. Understanding the causes can help you resolve the issue and restore comfort to your home.

Common Causes of a Constantly Running Air Handler

1. Dirty Air Filter: A clogged air filter restricts airflow, causing the air handler to overwork and run continuously. Replace the air filter regularly, especially during peak usage seasons.

2. Frozen Evaporator Coil: When the evaporator coil becomes iced over, it blocks airflow and triggers the air handler to run constantly. This can occur due to low refrigerant levels, dirty coils, or airflow problems.

3. Oversized AC Unit: An air conditioner that is too large for the space it’s cooling will cool the area too quickly and shut off frequently, causing the air handler to run continuously to maintain the set temperature.

4. Faulty Thermostat: A malfunctioning thermostat can send incorrect signals to the air handler, causing it to run even when the desired temperature is reached.

5. Dirty Condenser Coils: Dirt and debris on the condenser coils outside can reduce heat transfer, forcing the air handler to work harder and run longer.

6. Refrigerant Leak: A refrigerant leak can lead to insufficient cooling, causing the air handler to run constantly to compensate for the lost refrigerant.

7. Electrical Issues: Electrical problems, such as loose connections or faulty wiring, can interfere with the air handler‘s operation and cause it to run without stopping.

Troubleshooting Steps

1. Check the Air Filter: Remove the air filter and examine it for dirt or debris. Replace it with a clean one if necessary.

2. Inspect the Evaporator Coil: Turn off the power to the air conditioner and remove the access panel to inspect the evaporator coil. If it’s iced over, call a qualified HVAC technician.

3. Check the Thermostat: Set the thermostat to a different temperature and observe if the air handler stops running. If it doesn’t, the thermostat may be faulty.

4. Clean the Condenser Coils: Turn off the power to the outdoor unit and use a garden hose with a nozzle to gently spray away dirt and debris from the condenser coils.

5. Call a Professional: If you’ve checked and addressed the common causes but the air handler is still running constantly, it’s recommended to contact a qualified HVAC technician for further diagnosis and repair.

Preventative Measures

1. Regular Maintenance: Schedule regular maintenance by a qualified HVAC technician to keep your air conditioner in optimal condition and prevent problems from developing.

2. Clean Air Filters: Replace the air filter every month or two, especially during peak usage seasons.

3. Keep Outdoor Unit Clear: Ensure that the outdoor unit is free from debris and obstructions to prevent overheating.

4. Monitor Refrigerant Levels: Have the refrigerant levels checked by a qualified HVAC technician during regular maintenance.

5. Avoid Oversizing: When replacing your air conditioner, consult a professional to ensure it’s properly sized for your space.

Endnote: Resolving a Constantly Running Air Handler

Understanding the causes of a constantly running air handler is crucial for resolving the issue and restoring comfort to your home. By following the troubleshooting steps and implementing preventative measures, you can keep your air conditioner operating efficiently and reliably. Remember, if the problem persists or you encounter any electrical issues, it’s always advisable to seek professional assistance from a qualified HVAC technician.

FAQ

1. Why is my air handler running all the time, even when the AC is off?

• The fan may be set to “on” instead of “auto.”
• The air filter could be clogged.
• The thermostat may be malfunctioning.

2. What are the signs of a dirty evaporator coil?

• Reduced airflow
• Poor cooling performance
• Increased energy consumption

3. How often should I replace my air filter?

• Every 30-90 days, depending on usage and the type of filter.

4. Can a dirty air filter cause my air handler to run constantly?

• Yes, a clogged air filter restricts airflow and forces the air handler to work harder, leading to continuous operation.

5. What are the benefits of regular AC maintenance?

• Improved efficiency
• Extended lifespan
• Reduced energy costs