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HomeRepair HelpICP Central A/C RepairICP Central air conditioner compressor won't run Repair
ICP Central air conditioner compressor won't run
When your ICP central air conditioner compressor won't run, the system may blow warm air or fail to cool at all. The compressor is the most likely cause, but it is not usually the first part to replace. A defective compressor can be confirmed with a multimeter if its windings show an open circuit. Next, check the start capacitor, which helps the compressor start and may be bulging, leaking, or unable to hold a charge. A failed contactor can also keep the compressor from receiving power when the control board sends its signal. Less common causes include a faulty run capacitor, capacitor, or dual run capacitor, each of which supplies starting or operating power to the compressor. Turn off power at the disconnect box and circuit breaker before inspecting anything, and remember that capacitors can retain a dangerous charge. Testing or replacing parts in the 240-volt condensing unit requires appropriate electrical skill. Compressor replacement or any repair involving refrigerant requires an EPA 608-certified HVAC technician. Enter your ICP model number to find the exact replacement compressor, capacitor, contactor, or other part for your specific central air conditioner.
01 - ICP 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 - ICP 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 - ICP 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 - ICP 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 - ICP 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 - ICP 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 ICP central AC compressor not running?
How do I test an AC compressor that won't start?
Can a start capacitor or run capacitor keep my AC compressor from running?
How do I know if the ICP AC contactor is stopping the compressor from running?
How can I find the correct ICP compressor or capacitor replacement part?
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