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HomeRepair HelpMiller Central A/C RepairMiller Central air conditioner compressor won't run Repair
Miller Central air conditioner compressor won't run
When a Miller central air conditioner compressor won't run, the compressor may be worn out or defective, but that is not usually the first part to replace. The most likely cause is a failed start capacitor, which helps the compressor start and may be bulging, leaking, or unable to hold a charge. Next, check the contactor, which receives a low-voltage signal from the control board and sends power to the condensing unit. A defective contactor can keep the AC compressor from starting. Less common causes include a failed run capacitor, capacitor, or dual run capacitor that can no longer provide the voltage needed by the compressor. A multimeter can help test these parts, but capacitors can store a dangerous charge, and the contactor and compressor circuit use 240V line voltage. Turn off power at the disconnect box and circuit breaker before inspection, and use a qualified technician if you are not trained to test live electrical components. Compressor replacement or any repair involving refrigerant or the sealed system requires an EPA 608-certified HVAC technician. Enter your Miller central air conditioner model number to find the exact replacement start capacitor, contactor, run capacitor, or compressor for your unit.
01 - Miller Central Air Conditioner Compressor
The compressor is a pump which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. If the compressor is defective or worn out, it likely won't run. However, this isn’t usually the case. Before replacing the compressor, first check all of the more commonly defective components. If all of the other components are working properly, use a multimeter to test the compressor for continuity. If there is an open circuit, the compressor is likely defective.
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Highly Likely
02 - Miller Central Air Conditioner Start Capacitor
A start capacitor is often used to cycle on the compressor. If the capacitor burns out, the compressor may not run. The start capacitor can be tested with a multimeter to determine if the component can successfully hold and release its charge. If the capacitor is unable to hold and release a charge, or is bulging or leaking, the capacitor will need to be replaced.
Common
03 - Miller Central Air Conditioner Contactor
The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it can prevent the compressor from running. To determine if the contactor is at fault, use a multimeter to test the contactor coil for continuity. If the contactor coil does not have continuity or the contacts a on the coil look burnt, replace it.
Common
04 - Miller Central Air Conditioner Run Capacitor
A run capacitor will power either the compressor or the fan motor (a dual run capacitor will power both). If the capacitor burns out, the compressor may not run. To determine if the run capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
05 - Miller Central Air Conditioner Capacitor
The capacitor provides voltage to the compressor to start it. If the capacitor is defective, the compressor won't run. To determine if the capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
06 - Miller Central Air Conditioner Dual Run Capacitor
A dual run capacitor will power both the compressor and the fan motor. If the capacitor burns out, the compressor may not run. To determine if the dual run capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
Frequently Asked Questions
Why is my Miller central air conditioner compressor not running?
What should I check when my Miller AC condensing unit won't start?
How do I test a Miller AC start or run capacitor?
How can I test the contactor if my Miller air conditioner compressor won't start?
How do I find the correct replacement part for my Miller central air conditioner?
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