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HomeRepair HelpLennox Central A/C RepairLennox Central air conditioner not blowing enough Repair
Lennox Central air conditioner not blowing enough
When your Lennox central air conditioner is not blowing enough air, start with airflow restrictions before replacing parts. The most likely cause is a dirty evaporator coil, air filter, or blower wheel. A clogged filter or coil can reduce airflow and cause the evaporator coil to freeze. Next, a failing furnace blower motor can cause weak airflow from AC vents. With power safely disconnected, check whether the blower wheel turns freely, but electrical testing and motor replacement may involve 240V line voltage. Also check that every air register is fully open. If the filter, evaporator coil, and ductwork are clear, the blower motor may be improperly wired for the selected speed, which may require a qualified service technician. Dust and debris can also clog the Lennox blower wheel and housing, restricting airflow throughout the home. Clean the wheel carefully with compressed air or a soft brush because its fins are sharp and easily damaged. This troubleshooting applies when your central air is not blowing enough, has low airflow, or the air conditioner is not blowing hard. Enter your model number to find the exact replacement air filter, blower motor, or blower wheel for your Lennox central air conditioner. Turn off power before service, and leave 240V electrical work to a qualified technician.
01 - Dirty Evaporator Coil
Proper air flow is critical for the central air conditioner to work properly. The evaporator needs sufficient air flow to keep the condensing water from freezing. If the evaporator coil, air filter or blower wheel gets clogged, air flow will be reduced causing ice to start forming on the evaporator coils, eventually freezing them up. It is recommended to replace the air filter at least every 6 months or sooner depending on the conditions. Refer to owner's manual for air filter replacement frequency recommendations and for evaporator coil cleaning instructions.
Highly Likely
02 - Lennox Central Air Conditioner Blower Motor
Since the furnace's blower motor is the component that circulates the cooled air through the home's venting, a defective blower motor will result in the central air conditioner not blowing enough. You can use a multimeter to test the blower motor for electrical continuity, a continuous electrical path present in the motor, as well as determine if power is reaching the motor. You can also try turning the blower wheel by hand. If the wheel does not turn freely, it's likely the motor bearings have seized and the blower motor will need to be replaced.
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Highly Likely
03 - Register is Closed or Only Partially Opened
Some air registers have adjustable louvers that allow the air flow to be restricted or shut off entirely. This would be used to cut off the air flow to a room that isn't being used, or to restrict air flow to one room so more air will flow to the other rooms. If there is low air flow, check that the louvers are fully open.
Highly Likely
04 - Blower Motor Improperly Wired
Most central air conditioner blower motors have multiple speeds. Central air conditioners require higher speeds to move sufficent air throughout the home for cooling. If the blower was wired incorrectly it may not be moving enough air to properly cool the home. If the air filter and evaporator coil are clear and the air ducts are sealed properly but there is still not enough air flow, the blower may be wired incorrectly. Proper air flow is determined by several factors: the design of the duct work, the size of the home, and the size of the unit. A service technician may be required to determine if the air flow is sufficient for the home.
Highly Likely
05 - Lennox Central Air Conditioner Blower Wheel and Housing
Over time the blower wheel and housing can become clogged with dust and debris. This will restrict the air flow, preventing the central air system from blowing enough. You can try cleaning the blower wheel with compressed air or with a soft bristle brush. Use caution when trying to clean the blower wheel as the fins are sharp and can be easily damaged. If the blower is damaged it will need to be replaced.
Common
06 - Clogged Blower Wheel
Over time the blower wheel can become clogged with dust and debris. This will greatly affect the air flow circulating throughout the home. You can try cleaning the blower wheel with compressed air or with a soft bristle brush. Be sure to shut off power to the unit before attempting to clean the blower wheel. Use caution when trying to clean the blower wheel as the fins are sharp and can be easily damaged. If the blower is damaged it will need to be replaced.
Common
Frequently Asked Questions
Why is my Lennox central air conditioner not blowing enough air?
Can a clogged blower wheel cause weak airflow from AC vents?
How do I test a Lennox AC blower motor that is not moving enough air?
Why is my central air conditioner still blowing weak after I replace the filter?
How do I find the correct Lennox central AC blower motor or blower wheel replacement part?
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