Red Seal Appliance Service Technician Practice Exam

In sealed systems, what could a continuous running compressor indicate?

1. A high refrigerant charge

2. A complete system failure

3. Low refrigerant charge

4. A properly functioning system

The correct answer is: Low refrigerant charge

A continuously running compressor in sealed systems is often indicative of a low refrigerant charge. When there is insufficient refrigerant in the system, the compressor struggles to achieve the required pressure levels for efficient operation. As a result, it may run continuously in an attempt to lower the evaporator pressure and maintain cooling. This condition can lead to overheating and possible damage to the compressor, as it is not able to cycle effectively due to inadequate refrigerant levels. In a properly functioning system, the compressor would cycle on and off in response to the cooling demands. A high refrigerant charge would typically result in high pressures and could lead to different performance issues, while a complete system failure would prevent the compressor from running entirely. Thus, a continuous running compressor most accurately points to a low refrigerant charge situation, requiring investigation and corrective action to restore proper function.