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HomeRepair HelpMiller Central A/C RepairMiller Central air conditioner circuit breaker keeps tripping Repair
Miller Central air conditioner circuit breaker keeps tripping
When your Miller central air conditioner keeps tripping the circuit breaker or blowing fuses, the condenser fan motor is the most likely cause. A shorted winding or seized motor can overload the outdoor condensing unit. The next most likely cause is the furnace or air handler blower motor, especially if its bearings are seized, the blower wheel will not turn freely, or the motor has a short. Less common causes include a shorted compressor, control board, or damaged wire harness with loose or broken connections. This central air tripping breaker problem can involve dangerous 240V line voltage, so turn off power at the disconnect box and circuit breaker before inspecting anything, and do not test or replace electrical parts unless you are qualified to do so. Repeatedly resetting the breaker can create a fire or equipment hazard. A compressor replacement or any repair inside the sealed refrigerant system requires an EPA 608-certified HVAC technician. Enter your Miller central air conditioner model number to find the exact replacement condenser fan motor, blower motor, compressor, control board, or wire harness for your specific unit.
01 - Miller Central Air Conditioner Condenser Fan Motor
If the outdoor condensing unit's breaker or fuses keep tripping the condenser fan motor may be to blame. To determine if the condenser fan motor is shorted, use a multimeter to test the motor windings for a short to ground. If the condenser fan motor will not turn freely or the windings are shorted, replace the condenser fan motor.
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Common
02 - Miller Central Air Conditioner Fan Motor
If the outdoor condensing unit's breaker or fuses keep tripping the condenser fan motor may be to blame. To determine if the outdoor fan motor is shorted, use a multimeter to test the motor windings for a short to ground. If the outdoor fan motor will not turn freely or the windings are shorted, it will need to be replaced.
Common
03 - Miller Central Air Conditioner Blower Motor
Since the furnace or air handler's blower motor is the component that circulates the air through the home's venting, a defective blower motor may result in the circuit breaker tripping. You can try disconnecting the motor from the control board and see if the breaker still trips. You can also use a multimeter to test the blower motor for an electrical short, or see if there are any burnt smells coming from 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. If the motor doesn't turn freely or is shorted the blower motor will need to b...
Common
04 - Miller Central Air Conditioner Compressor
The compressor is located in the outdoor condensing unit and gets power through a service panel box next to the unit. If the compressor is shorted the fuses in the service panel box or the main breaker box may trip. You can test the compressor for shorts by using a multimeter. If the compressor windings are shorted the compressor itself or the whole unit will need to be replaced.
Less Common
05 - Miller Central Air Conditioner Control Board
The control board regulates the power supply to all of the components of the furnace or air handler. 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
06 - Miller Central 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
Frequently Asked Questions
Why does my Miller central air conditioner keep tripping the breaker?
How do I test a Miller condenser fan motor that is tripping the breaker?
Can a blower motor cause my Miller AC breaker to trip?
Could the Miller compressor or control board be causing the breaker to trip?
How do I find the correct replacement part for my Miller central air conditioner?
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