If a compressor fails to start while the motor is operational, what could be a likely cause?

In this scenario, when a compressor fails to start but the motor is operational, a likely cause is that the coupling is sheared or broken. The coupling connects the motor to the compressor, enabling the motor's rotational force to drive the compressor's operation. If this component fails, the motor can continue to run, but it won't be able to transfer its energy to the compressor, which means the compressor cannot start or perform its intended function.

While low power supply or a malfunctioning thermostat could lead to operational issues, they typically wouldn't allow the motor to run while the compressor does not start. A refrigerant leak pertains to the cooling system function but usually wouldn’t prevent the compressor from starting if the motor is already running. Therefore, a sheared or broken coupling directly affects the mechanical connection necessary for compressor operation.