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HomeRepair HelpBroan Central A/C RepairBroan Central air conditioner compressor won't run Repair
Broan Central air conditioner compressor won't run
When your Broan central air conditioner compressor won't run, the outdoor condensing unit may not cool your home even though the indoor blower operates. The compressor is the most likely cause listed for an AC compressor not running, but it is not usually the first part to replace. A failed start capacitor is the next likely problem and may leave the compressor humming, unable to start, or cycling off. A defective contactor can also prevent voltage from reaching the compressor, followed by a failed run capacitor, capacitor, or dual run capacitor. Inspect for bulging or leaking capacitors, and use a multimeter to test components only if you are qualified to do so. The compressor, contactor, capacitors, disconnect box, and other outdoor components involve 240V line voltage, so shut off power and leave energized-circuit testing to a qualified technician. Compressor replacement or any repair involving refrigerant, the refrigerant lines, or the sealed system requires an EPA 608-certified HVAC technician. Enter your Broan central air conditioner model number to find the exact replacement part for your specific system.
01 - Broan 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 - Broan 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 - Broan 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 - Broan 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 - Broan 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 - Broan 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 Broan air conditioner compressor not running?
How do I test an AC start capacitor or run capacitor?
How can I tell if the contactor is stopping my AC compressor from starting?
How do I know whether the compressor itself is defective?
How do I find the correct Broan AC compressor or capacitor part?
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