Lennox is a leading manufacturer of central air conditioners in the United States. Well known for reliability, Lennox central air conditioners provide years of comfort for many homes across America. As is the case with any mechanical devices, occasionally central air conditioner parts stop working and need replacement. You can diagnose and repair some central air conditioner problems on your own. When you need repair parts, Sears PartsDirect has the genuine Lennox central air conditioner parts you need to get your unit running again.
What to do when your Lennox central air conditioner isn't cooling
Check the thermostat settings. Make sure the thermostat is set to the Cool setting. Check the temperature setting and adjust it if necessary. If the thermostat isn't working, shut off the house circuit breakers for the central air conditioner and check the thermostat wiring connections. Replace the thermostat if wiring connections are okay but the thermostat won't power up.
Check the house circuit breakers for the outside unit. Reset the house circuit breakers for the outside unit. Check the breaker on the side of the house near the outside unit and reset that breaker if it's tripped.
Change the air filter. A clogged air filter can cause the evaporator to freeze up. Replace the air filter if it's dirty.
Check the condensate drain line. A clogged condensate drain line will cause water to back up in the condensate drain system and trip the drain overflow float switch. The air conditioner won't cool when that drain float switch trips. Clear the clogged condensate drain line to reset the float switch.
Clear debris from around the outside unit. Leaves and grass around the outside condenser unit can prevent the air conditioner from cooling properly. Clear any grass, leaves or other debris from the outside of the condenser unit.
Operating tips for your Lennox central air conditioner
Never operate the central air conditioner without a clean air filter properly installed. Inspect the air filter monthly and replace the air filter when it's dirty. A clogged air filter will increase operating costs and cause cooling problems.
Keep supply air register vents and return air vents clear. Don't allow drapes, furniture, toys or other items to block supply or return air vents. Clean air vent louvers when they're dirty.
Keep the outdoor condenser unit clear of shrubs, weeds grass and debris. Maintain a 1-foot clearance around the condenser unit for proper airflow.
Jiggling the wall control thermostat causes rapid cycling in the control system and this can cause damage to air conditioner components. Don't move the temperature selector on the thermostat for at least 5 minutes between adjustments.
Running the blower fan continuously minimizes temperature differences inside supply ducts and can lead to greater comfort and cooling efficiency. Consider running the blower fan constantly during hot summer months.