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HomeRepair HelpLennox A/C RepairLennox Air conditioner circuit breaker keeps tripping Repair
Lennox Air conditioner circuit breaker keeps tripping
If your Lennox air conditioner trips the breaker, do not keep resetting it and hoping it holds. An AC breaker keeps tripping when something in the unit is drawing too much current or shorting to ground. The most likely cause is an air conditioner power cord problem, especially on window units with an LCDI circuit protector that can trip before the main breaker. Next, check for a shorted condenser fan motor, dual shaft fan motor, or blower motor, since burned motor windings can trip the circuit as soon as power is applied and may give off a burnt smell. A damaged wire harness can also short if insulation is broken or a connection is loose. Less commonly, a shorted control board may be the reason your Lennox air conditioner trips breaker, often with visible burn marks or a burnt odor. Once you identify the failed part, enter your model number on RepairClinic.com to find the exact replacement power cord, fan motor, blower motor, wire harness, or control board for your specific Lennox air conditioner.
01 - Lennox Air Conditioner Power Cord
Most window air conditioners have an LCDI circuit protector that will detect a short in the cord or a component in the unit. If the circuit breaker on the cord is damaged or any of the components in the unit are shorted the circuit breaker will trip. The circuit breaker on the cord is usually more sensitive and will trip before the main breaker.
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Common
02 - Lennox Air Conditioner Condenser Fan Motor
An air conditioner condenser fan motor is the component that spins both the condenser fan blade in the rear of the unit. If the fan motor is burned out or shorted it may trip the circuit breaker. You can use a multimeter to check if the motor windings are shorted. A shorted motor will usually have a burnt smell and will need to be replaced.
Common
03 - Lennox Air Conditioner Dual Shaft Fan Motor
An air conditioner dual shaft fan motor is the component that spins both the condenser fan blade in the rear of the unit and the fan blade that forces the cooled air out the front vent. If the fan motor is burned out or shorted it may trip the circuit breaker. You can use a multimeter to check if the motor windings are shorted. A shorted motor will usually have a burnt smell and will need to be replaced.
Common
04 - Lennox Air Conditioner Blower Motor
If the blower motor windings are shorted out the breaker will likely trip when power is applied to the motor. You can try disconnecting the motor from the unit to see if the breaker will still trip. You can use a multimeter to check if the motor windings are shorted. A shorted motor will usually have a burnt smell and will need to be replaced.
Common
05 - Lennox Air Conditioner Wire Harness
A wire harness sends power and low voltage signals between the electrical components and the control board. If a wire harness becomes damaged, it can short out causing the circuit breaker to trip. Check the appropriate wire harnesses for breaks or loose connections. A damaged wire harness will need to be replaced.
Less Common
06 - Lennox Air Conditioner Control Board
The control board regulates the power supply to all of the components of the air conditioner. If the control board shorts out it can trip the circuit breaker. A shorted control board will usually have burn marks or smell burnt and will need to be replaced.
Less Common
Frequently Asked Questions
Why does my Lennox air conditioner trip the circuit breaker as soon as it turns on?
Can a bad power cord make my Lennox window air conditioner trip the circuit breaker?
How do I test a Lennox AC fan motor when the breaker keeps tripping?
Should I replace the Lennox air conditioner control board if the AC breaker keeps tripping?
Could a compressor problem make my Lennox air conditioner trip the breaker?
How do I find the right replacement part for my Lennox air conditioner?
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