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HomeRepair HelpMammoth Central A/C RepairMammoth Central air conditioner compressor won't run Repair
Mammoth Central air conditioner compressor won't run
When your Mammoth central air conditioner compressor is not running, the system may have a failed compressor, start capacitor, contactor, run capacitor, capacitor, or dual run capacitor. Although a defective compressor can cause an air conditioner compressor to not start, it is not usually the first part to replace. A worn compressor may show an open circuit when tested for continuity with a multimeter. A failed start capacitor is a common cause, especially if it is bulging, leaking, or cannot hold and release a charge. Next, inspect the contactor, which closes the high-voltage circuit to the condensing unit when it receives a signal from the furnace control board. A faulty run capacitor, standard capacitor, or dual run capacitor can also prevent the compressor from starting. This central AC compressor troubleshooting involves dangerous 240V electricity, and capacitors can retain a charge after power is disconnected. Turn off power at the disconnect box and circuit breaker, and have a qualified HVAC technician handle live-voltage testing. Compressor replacement or any repair inside the sealed system requires an EPA 608-certified technician because it may involve refrigerant. Enter your model number to find the exact Mammoth replacement part for your central air conditioner.
01 - Mammoth 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 - Mammoth 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 - Mammoth 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 - Mammoth 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 - Mammoth 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 - Mammoth 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 Mammoth central air conditioner compressor not running?
Can a bad capacitor cause an AC compressor not to start?
How do I test the contactor when my AC compressor won't run?
How can I tell if the compressor is defective instead of the capacitor or contactor?
How do I find the correct Mammoth AC compressor or capacitor replacement part?
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