Air Quality

Troubleshooting and Resetting Your Lennox Air Conditioner: A Comprehensive Guide

Lennox air conditioner

While Lennox air conditioners are known for their reliability, there may come a time when you need to reset them. Not to worry, as we have compiled a step-by-step guide to help you navigate through the resetting process efficiently.

Steps to Restart Your Lennox Air Conditioner:

Follow these steps to restart your Lennox air conditioner:

1. Begin by turning on your thermostat’s cooling unit with closed doors.
2. Locate the switch and breaker for the electrical circuit powering your Lennox air conditioner.
3. Reset the breaker.
4. Wait for 30 seconds before turning the unit back on.
5. Finally, activate your cooling system using the thermostat.

Resetting your Lennox air conditioner may be necessary for various reasons, such as unusual noise, water leakage, or failure to turn on. This article explores the reasons for resetting and provides a step-by-step guide on how to do it.

Lennox Air Conditioner Reset Procedure:

A home air conditioner functions by extracting warm air from the space, cooling it, and circulating it back into the room until the desired temperature is reached. Like any other device, Lennox air conditioners may require a reset for various reasons. Some scenarios where a reset might be necessary include:

1. Unusual noise without effective cooling.
2. Hardware issues leading to water leakage.
3. Unused air conditioning for an extended period.
4. The need to turn on the air conditioner after it has been turned off at the thermostat.
5. Unexplained failure to turn on the Lennox air conditioner.

Resetting the Lennox air conditioner can be beneficial in addressing errors or malfunctions. To perform the reset:

1. Turn off the thermostat’s AC unit.
2. Switch off the breaker for at least 30 seconds before restarting.
3. After turning on the breaker, use the thermostat to exit the reset mode.

If issues persist, it is advisable to seek assistance from an HVAC professional.

Locating the Lennox Air Conditioner’s Reset Button:

Contrary to some air conditioners, Lennox units do not have a specific “reset switch.” However, a pressure switch can be reset to restart the system. Follow these steps:

1. Turn off the breaker connected to the Lennox air conditioning system to cut off power.
2. Remove the backboard for better access.
3. Look for the liquid line at the bottom of the unit. If a red rubber push switch is present, press it to reset the pressure switch.

If the problem persists and a yellow light is flashing intermittently, there might be another issue that requires attention.

Common Issues with Lennox Air Conditioners and Possible Solutions:

1. Blocked Air Filter:

– Solution: Clean or replace the air filter monthly to ensure proper functioning.

2. Faulty Thermostat:

– Solution: If the thermostat is damaged or misaligned, it might need replacement.

3. Reset Circuit Breaker:

– Solution: If the breaker keeps tripping, turning it off and restarting may resolve the issue.

4. Contaminated Condenser Coils:

– Solution: Clean the coils to address issues with unit operation.

5. Bad Compressor:

– Solution: Seek assistance from an HVAC professional if the compressor is faulty.

6. Damaged Control Board:

– Solution: Replace the control board if it fails to manage unit functions.

7. Temperature Control Board Damage:

– Solution: Check various components before considering the replacement of the temperature control board.

8. Defective Thermostat Temperature Control:

– Solution: Replace the thermostat if it is operating but not cooling properly.

9. Failure of Input Power:

– Solution: Report power failures to service providers for investigation and resolution.

10. Blown Blower Motor:

– Solution: Promptly replace the blower motor to prevent further damage.

Is Lennox HVAC Reliable?

Lennox air conditioners are renowned for their reliability when properly maintained. Regular check-ups are essential to identify and address potential issues promptly.

Typical Lifespan of Lennox Air Conditioners:

Under normal circumstances, Lennox AC units typically last between 15 to 20 years. Consider upgrading to a more efficient model before the 12-year mark for enhanced performance.

In conclusion, resetting your Lennox air conditioner is a straightforward process that can address common issues. However, if problems persist, seeking professional help is advisable for a thorough inspection and resolution.

Disclosure: We may get commissions for purchases made through links in this post.

About the author


I am Ben , a seasoned HVAC specialist with over 6 of experience in the HVAC industry. I holds HVAC Certification and has a proven track record in providing expert advice on HVAC systems.

Leave a Comment