Resetting a Lennox™ AC seems easy but you must know what you’re dealing with before you start.
Most homes have an outside AC unit and an inside furnace unit that houses the fan for air circulation.
Knowing the difference between these two will help you reset the right unit and get your system running right.
In this article, Orzech Heating & Cooling will walk you through the steps to reset a Lennox AC unit properly.
Outside AC vs Furnace Unit
Your Lennox HVAC system has several components, each does a specific job. The outside AC unit, also called the condenser, is outside your home. This unit cools the air by releasing the heat absorbed inside your home to the outside air. It’s the part of your system that makes that humming noise when the air conditioning is running.
The furnace unit is usually located in your basement. This unit has a blower fan that blows air through your home’s ductwork. While the furnace unit heats your home in the winter, it also plays a big role in distributing the cool air from the outside AC unit in the summer.
When we say reset your Lennox AC unit we mean the outside AC unit, not the indoor furnace unit. Make sure to make this distinction so you don’t get confused during the reset process.
Safety Precautions Before Resetting Your Outside AC Unit
Before you reset your outside AC unit, follow these safety precautions. First, shut off the power to the entire HVAC system at the circuit breaker, not just the thermostat. This will ensure there’s no risk of electrical shock and make the reset process safe.
After turning off the power, wait at least 5 minutes to allow the system to fully shut down. This pause is crucial for ensuring that the reset will be effective when you restart the system.
Step-by-Step Guide to Resetting a Lennox Outside AC Unit
1. Locate the Outdoor Disconnect for the AC Unit
Lennox AC units typically have an outdoor disconnect located on the wall near the outdoor condenser unit. This disconnect controls the power to the unit. Ensure you’re working with the outdoor condenser, not the indoor furnace unit. If you’re unsure about how to use the disconnect or need further assistance, consult the unit’s manual or contact Lennox customer support for guidance.
2. Turn the switch off
After locating the outdoor disconnect, either flip the switch to the “off” position or pull out the disconnect. Wait for about 30 seconds to allow the unit to fully shut down.
3. Turn the Power Back On
Once the time has passed, turn the disconnect back on to restore power to the AC unit. You should notice the system beginning to restart shortly after. Then, turn your AC back on using the thermostat. Allow a few minutes for the system to start up and reach its normal operating mode. If the reset was successful, your Lennox AC unit should begin cooling your home as expected.
What to Do If the Reset Doesn’t Work
If resetting the outside AC unit doesn’t resolve the issue, take these additional steps:
- Listen for Unusual Noises: Any strange noises coming from the unit could signal mechanical issues.
- Consult the Manual: Your Lennox unit’s manual will have specific troubleshooting steps and error codes to guide you.
- Call a Professional: If the problem persists after troubleshooting, contact a professional HVAC technician. There could be an underlying issue that a simple reset won’t fix.
Conclusion
Resetting your Lennox AC unit is easy but make sure you’re working with the right component of your HVAC system. Now that you know the difference between the outside AC unit and the indoor furnace unit you can reset safely and effectively. If you still have issues after following these steps, call a professional HVAC technician to get your system running smoothly.
