What To Know
- The air handler is responsible for circulating the conditioned air throughout your home, so when it’s not working, you may notice a lack of airflow or even warm air.
- A leak in the refrigerant lines can lead to a loss of cooling capacity, preventing the air handler from cooling the air.
- Troubleshooting an air handler that is not coming on can be a challenging task, but by following the steps outlined in this guide, you can identify and resolve the issue in most cases.
If your home’s air handler is not coming on, it can be a frustrating and uncomfortable experience. The air handler is responsible for circulating the conditioned air throughout your home, so when it’s not working, you may notice a lack of airflow or even warm air. In this blog post, we will explore the most common reasons why an air handler might not be coming on and provide step-by-step troubleshooting tips to help you get your system up and running again.
Common Causes of Air Handler Failure
Before attempting any troubleshooting, it’s important to understand the potential causes of air handler failure. Here are some of the most common issues:
- Power supply problems: Ensure that the air handler is receiving power by checking the circuit breaker or fuse box.
- Thermostat malfunction: The thermostat communicates with the air handler to control the temperature. A faulty thermostat can prevent the air handler from turning on.
- Dirty air filter: A clogged air filter can restrict airflow, causing the air handler to overheat and shut off.
- Refrigerant leak: A leak in the refrigerant lines can lead to a loss of cooling capacity, preventing the air handler from cooling the air.
- Faulty capacitor: The capacitor is an electrical component that helps the air handler start up. A faulty capacitor can prevent the air handler from turning on.
- Frozen coils: In cold weather, the coils in the air handler can freeze, preventing airflow and causing the system to shut off.
- Damaged wiring: Loose or damaged wiring can disrupt the electrical connections between the air handler and other components.
Troubleshooting Steps
Once you have identified the potential cause of the air handler failure, follow these troubleshooting steps:
1. Check the Power Supply
- Ensure that the circuit breaker or fuse associated with the air handler is in the “on” position.
- If the circuit breaker has tripped or the fuse has blown, reset or replace it.
- If the power supply is still not restored, contact a qualified electrician.
2. Inspect the Thermostat
- Check if the thermostat is set to “cool” or “heat” mode.
- Replace the batteries in the thermostat.
- If the thermostat is still not functioning properly, it may need to be replaced.
3. Clean or Replace the Air Filter
- Locate the air filter in the air handler.
- Remove the filter and inspect it for dirt and debris.
- If the filter is dirty, clean or replace it with a new one.
4. Check for Refrigerant Leaks
- Refrigerant leaks can be difficult to detect without special equipment.
- If you suspect a leak, contact an HVAC technician for professional diagnosis and repair.
5. Test the Capacitor
- Capacitors can be tested using a multimeter.
- If the capacitor is faulty, it will need to be replaced.
6. Thaw Frozen Coils
- If the coils in the air handler are frozen, turn off the system and allow the ice to melt.
- Once the ice has melted, restart the system.
7. Inspect Wiring
- Check for loose or damaged wiring connections in the air handler.
- Tighten any loose connections and replace any damaged wires.
When to Call a Professional
If you have tried the troubleshooting steps above and the air handler is still not coming on, it’s recommended to contact a qualified HVAC technician. They have the necessary tools and expertise to diagnose and repair complex issues.
The Bottom Line
Troubleshooting an air handler that is not coming on can be a challenging task, but by following the steps outlined in this guide, you can identify and resolve the issue in most cases. Remember, if the problem persists or you are not comfortable with electrical work, do not hesitate to seek professional assistance to ensure the safety and proper functioning of your air conditioning system.
What You Need to Learn
Q1: What are the signs of a faulty air handler?
A: Common signs of a faulty air handler include lack of airflow, warm air, strange noises, and increased energy bills.
Q2: How often should I change my air filter?
A: It is recommended to change your air filter every 1-3 months, depending on the type of filter and usage.
Q3: What is the cost of repairing an air handler?
A: The cost of repairing an air handler varies depending on the issue and the complexity of the repair. Minor repairs may cost around $100, while major repairs can exceed $1,000.
