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HomeRepair HelpTempstar Central A/C RepairTempstar Central air conditioner compressor won't run Repair
Tempstar Central air conditioner compressor won't run
When your Tempstar central air conditioner compressor won't run, the compressor may be defective or worn out, but test the more commonly failed electrical parts first. A failed start capacitor is the next likely cause because it helps cycle the compressor on. A defective contactor can also keep the compressor from receiving power when the furnace control board sends the start signal. Less common causes include a failed run capacitor, standard compressor capacitor, or dual run capacitor, which may prevent the compressor or condenser fan motor from starting. These parts can show bulging, leaking, burnt contacts, or failed multimeter tests. This troubleshooting applies when the AC compressor is not running even though the thermostat is calling for cooling. Turn off power at the disconnect box and circuit breaker before inspection. Capacitors, contactors, and compressor wiring involve stored or 240-volt electricity, so hire a qualified technician for line-voltage testing or replacement if you are not trained. Compressor replacement or any sealed-system repair requires an EPA 608-certified HVAC technician because it involves refrigerant. Enter your Tempstar model number to find the exact replacement compressor, start capacitor, contactor, run capacitor, or dual run capacitor for your central air conditioner.
01 - Tempstar 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 - Tempstar 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 - Tempstar 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 - Tempstar 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 - Tempstar 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 - Tempstar 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 Tempstar central AC compressor not running?
Can a bad start or run capacitor cause an AC compressor not to start?
How do I test the contactor when my Tempstar AC compressor won't run?
Does a failed compressor mean I need to replace the compressor?
How do I find the correct Tempstar AC compressor or capacitor replacement part?
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